GalaSoft.MvvmLight

A command whose sole purpose is to relay its functionality to other objects by invoking delegates. The default return value for the CanExecute method is 'true'. This class does not allow you to accept command parameters in the Execute and CanExecute callback methods.

If you are using this class in WPF4.5 or above, you need to use the GalaSoft.MvvmLight.CommandWpf namespace (instead of GalaSoft.MvvmLight.Command). This will enable (or restore) the CommandManager class which handles automatic enabling/disabling of controls based on the CanExecute delegate.

Initializes a new instance of the RelayCommand class that can always execute.

The execution logic. IMPORTANT: If the action causes a closure, you must set keepTargetAlive to true to avoid side effects. If true, the target of the Action will be kept as a hard reference, which might cause a memory leak. You should only set this parameter to true if the action is causing a closure. See http://galasoft.ch/s/mvvmweakaction. If the execute argument is null.

Initializes a new instance of the RelayCommand class.

The execution logic. IMPORTANT: If the action causes a closure, you must set keepTargetAlive to true to avoid side effects. The execution status logic. IMPORTANT: If the func causes a closure, you must set keepTargetAlive to true to avoid side effects. If true, the target of the Action will be kept as a hard reference, which might cause a memory leak. You should only set this parameter to true if the action is causing a closures. See http://galasoft.ch/s/mvvmweakaction. If the execute argument is null.

Occurs when changes occur that affect whether the command should execute.

Raises the event.

Defines the method that determines whether the command can execute in its current state.

This parameter will always be ignored. true if this command can be executed; otherwise, false.

Defines the method to be called when the command is invoked.

This parameter will always be ignored.

A generic command whose sole purpose is to relay its functionality to other objects by invoking delegates. The default return value for the CanExecute method is 'true'. This class allows you to accept command parameters in the Execute and CanExecute callback methods.

The type of the command parameter. If you are using this class in WPF4.5 or above, you need to use the GalaSoft.MvvmLight.CommandWpf namespace (instead of GalaSoft.MvvmLight.Command). This will enable (or restore) the CommandManager class which handles automatic enabling/disabling of controls based on the CanExecute delegate.

Initializes a new instance of the RelayCommand class that can always execute.

Initializes a new instance of the RelayCommand class.

The execution logic. IMPORTANT: If the action causes a closure, you must set keepTargetAlive to true to avoid side effects. The execution status logic. IMPORTANT: If the func causes a closure, you must set keepTargetAlive to true to avoid side effects. If true, the target of the Action will be kept as a hard reference, which might cause a memory leak. You should only set this parameter to true if the action is causing a closure. See http://galasoft.ch/s/mvvmweakaction. If the execute argument is null.

Occurs when changes occur that affect whether the command should execute.

Raises the event.

Defines the method that determines whether the command can execute in its current state.

Data used by the command. If the command does not require data to be passed, this object can be set to a null reference true if this command can be executed; otherwise, false.

Defines the method to be called when the command is invoked.

Data used by the command. If the command does not require data to be passed, this object can be set to a null reference

Helper class for platform detection.

Helper class used when an async method is required, but the context is synchronous.

Gets the empty task.

Helper class for platform and feature detection.

This interface is meant for the class and can be useful if you store multiple WeakAction{T} instances but don't know in advance what type T represents.

The target of the WeakAction.

Executes an action.

A parameter passed as an object, to be casted to the appropriate type.

Deletes all references, which notifies the cleanup method that this entry must be deleted.

This interface is meant for the class and can be useful if you store multiple WeakFunc{T} instances but don't know in advance what type T represents.

Executes a Func and returns the result.

A parameter passed as an object, to be casted to the appropriate type. The result of the operation.

Stores an without causing a hard reference to be created to the Action's owner. The owner can be garbage collected at any time.

Gets or sets the corresponding to this WeakAction's method passed in the constructor.

Gets the name of the method that this WeakAction represents.

Gets or sets a WeakReference to this WeakAction's action's target. This is not necessarily the same as , for example if the method is anonymous.

Saves the as a hard reference. This is used in relation with this instance's constructor and only if the constructor's keepTargetAlive parameter is true.

Gets or sets a WeakReference to the target passed when constructing the WeakAction. This is not necessarily the same as , for example if the method is anonymous.

Gets a value indicating whether the WeakAction is static or not.

Initializes an empty instance of the class.

Initializes a new instance of the class.

The action that will be associated to this instance. If true, the target of the Action will be kept as a hard reference, which might cause a memory leak. You should only set this parameter to true if the action is using closures. See http://galasoft.ch/s/mvvmweakaction.

Initializes a new instance of the class.

The action's owner. The action that will be associated to this instance. If true, the target of the Action will be kept as a hard reference, which might cause a memory leak. You should only set this parameter to true if the action is using closures. See http://galasoft.ch/s/mvvmweakaction.

Gets a value indicating whether the Action's owner is still alive, or if it was collected by the Garbage Collector already.

Gets the Action's owner. This object is stored as a .

The target of the weak reference.

Executes the action. This only happens if the action's owner is still alive.

Sets the reference that this instance stores to null.

Stores an Action without causing a hard reference to be created to the Action's owner. The owner can be garbage collected at any time.

The type of the Action's parameter.

Gets the name of the method that this WeakAction represents.

Gets a value indicating whether the Action's owner is still alive, or if it was collected by the Garbage Collector already.

Initializes a new instance of the WeakAction class.

Executes the action. This only happens if the action's owner is still alive. The action's parameter is set to default(T).

Executes the action. This only happens if the action's owner is still alive.

A parameter to be passed to the action.

Executes the action with a parameter of type object. This parameter will be casted to T. This method implements and can be useful if you store multiple WeakAction{T} instances but don't know in advance what type T represents.

The parameter that will be passed to the action after being casted to T.

Sets all the actions that this WeakAction contains to null, which is a signal for containing objects that this WeakAction should be deleted.

Stores a Func<T> without causing a hard reference to be created to the Func's owner. The owner can be garbage collected at any time.

The type of the result of the Func that will be stored by this weak reference.

Gets or sets the corresponding to this WeakFunc's method passed in the constructor.

Get a value indicating whether the WeakFunc is static or not.

Gets the name of the method that this WeakFunc represents.

Gets or sets a WeakReference to this WeakFunc's action's target. This is not necessarily the same as , for example if the method is anonymous.

Saves the as a hard reference. This is used in relation with this instance's constructor and only if the constructor's keepTargetAlive parameter is true.

Gets or sets a WeakReference to the target passed when constructing the WeakFunc. This is not necessarily the same as , for example if the method is anonymous.

Initializes an empty instance of the WeakFunc class.

Initializes a new instance of the WeakFunc class.

The Func that will be associated to this instance. If true, the target of the Action will be kept as a hard reference, which might cause a memory leak. You should only set this parameter to true if the action is using closures. See http://galasoft.ch/s/mvvmweakaction.

Initializes a new instance of the WeakFunc class.

The Func's owner. The Func that will be associated to this instance. If true, the target of the Action will be kept as a hard reference, which might cause a memory leak. You should only set this parameter to true if the action is using closures. See http://galasoft.ch/s/mvvmweakaction.

Gets a value indicating whether the Func's owner is still alive, or if it was collected by the Garbage Collector already.

Gets the Func's owner. This object is stored as a .

Gets the owner of the Func that was passed as parameter. This is not necessarily the same as , for example if the method is anonymous.

Executes the action. This only happens if the Func's owner is still alive.

The result of the Func stored as reference.

Sets the reference that this instance stores to null.

Stores an Func without causing a hard reference to be created to the Func's owner. The owner can be garbage collected at any time.

The type of the Func's parameter. The type of the Func's return value.

Gets or sets the name of the method that this WeakFunc represents.

Gets a value indicating whether the Func's owner is still alive, or if it was collected by the Garbage Collector already.

Initializes a new instance of the WeakFunc class.

Executes the Func. This only happens if the Func's owner is still alive. The Func's parameter is set to default(T).

The result of the Func stored as reference.

Executes the Func. This only happens if the Func's owner is still alive.

A parameter to be passed to the action. The result of the Func stored as reference.

Executes the Func with a parameter of type object. This parameter will be casted to T. This method implements and can be useful if you store multiple WeakFunc{T} instances but don't know in advance what type T represents.

The parameter that will be passed to the Func after being casted to T. The result of the execution as object, to be casted to T.

Sets all the funcs that this WeakFunc contains to null, which is a signal for containing objects that this WeakFunc should be deleted.

Defines a common interface for classes that should be cleaned up, but without the implications that IDisposable presupposes. An instance implementing ICleanup can be cleaned up without being disposed and garbage collected.

Cleans up the instance, for example by saving its state, removing resources, etc...

Passes a generic value (Content) to a recipient.

The type of the Content property.

Initializes a new instance of the GenericMessage class.

The message content.

Initializes a new instance of the GenericMessage class.

The message's sender. The message content.

Initializes a new instance of the GenericMessage class.

Gets or sets the message's content.

The Messenger is a class allowing objects to exchange messages.

Registers a recipient for a type of message TMessage. The action parameter will be executed when a corresponding message is sent. Registering a recipient does not create a hard reference to it, so if this recipient is deleted, no memory leak is caused.

The type of message that the recipient registers for. The recipient that will receive the messages. The action that will be executed when a message of type TMessage is sent. IMPORTANT: Note that closures are not supported at the moment due to the use of WeakActions (see http://stackoverflow.com/questions/25730530/). If true, the target of the Action will be kept as a hard reference, which might cause a memory leak. You should only set this parameter to true if the action is using closures. See http://galasoft.ch/s/mvvmweakaction.

Registers a recipient for a type of message TMessage. The action parameter will be executed when a corresponding message is sent. See the receiveDerivedMessagesToo parameter for details on how messages deriving from TMessage (or, if TMessage is an interface, messages implementing TMessage) can be received too. Registering a recipient does not create a hard reference to it, so if this recipient is deleted, no memory leak is caused.

The type of message that the recipient registers for. The recipient that will receive the messages. A token for a messaging channel. If a recipient registers using a token, and a sender sends a message using the same token, then this message will be delivered to the recipient. Other recipients who did not use a token when registering (or who used a different token) will not get the message. Similarly, messages sent without any token, or with a different token, will not be delivered to that recipient. If true, message types deriving from TMessage will also be transmitted to the recipient. For example, if a SendOrderMessage and an ExecuteOrderMessage derive from OrderMessage, registering for OrderMessage and setting receiveDerivedMessagesToo to true will send SendOrderMessage and ExecuteOrderMessage to the recipient that registered. Also, if TMessage is an interface, message types implementing TMessage will also be transmitted to the recipient. For example, if a SendOrderMessage and an ExecuteOrderMessage implement IOrderMessage, registering for IOrderMessage and setting receiveDerivedMessagesToo to true will send SendOrderMessage and ExecuteOrderMessage to the recipient that registered. The action that will be executed when a message of type TMessage is sent. If true, the target of the Action will be kept as a hard reference, which might cause a memory leak. You should only set this parameter to true if the action is using closures. See http://galasoft.ch/s/mvvmweakaction.

The type of message that the recipient registers for. The recipient that will receive the messages. If true, message types deriving from TMessage will also be transmitted to the recipient. For example, if a SendOrderMessage and an ExecuteOrderMessage derive from OrderMessage, registering for OrderMessage and setting receiveDerivedMessagesToo to true will send SendOrderMessage and ExecuteOrderMessage to the recipient that registered. Also, if TMessage is an interface, message types implementing TMessage will also be transmitted to the recipient. For example, if a SendOrderMessage and an ExecuteOrderMessage implement IOrderMessage, registering for IOrderMessage and setting receiveDerivedMessagesToo to true will send SendOrderMessage and ExecuteOrderMessage to the recipient that registered. The action that will be executed when a message of type TMessage is sent. If true, the target of the Action will be kept as a hard reference, which might cause a memory leak. You should only set this parameter to true if the action is using closures. See http://galasoft.ch/s/mvvmweakaction.

Sends a message to registered recipients. The message will reach all recipients that registered for this message type using one of the Register methods.

The type of message that will be sent. The message to send to registered recipients.

Sends a message to registered recipients. The message will reach only recipients that registered for this message type using one of the Register methods, and that are of the targetType.

The type of message that will be sent. The type of recipients that will receive the message. The message won't be sent to recipients of another type. The message to send to registered recipients.

Sends a message to registered recipients. The message will reach only recipients that registered for this message type using one of the Register methods, and that are of the targetType.

The type of message that will be sent. The message to send to registered recipients. A token for a messaging channel. If a recipient registers using a token, and a sender sends a message using the same token, then this message will be delivered to the recipient. Other recipients who did not use a token when registering (or who used a different token) will not get the message. Similarly, messages sent without any token, or with a different token, will not be delivered to that recipient.

Unregisters a messager recipient completely. After this method is executed, the recipient will not receive any messages anymore.

The recipient that must be unregistered.

Unregisters a message recipient for a given type of messages only. After this method is executed, the recipient will not receive messages of type TMessage anymore, but will still receive other message types (if it registered for them previously).

The type of messages that the recipient wants to unregister from. The recipient that must be unregistered.

Unregisters a message recipient for a given type of messages only and for a given token. After this method is executed, the recipient will not receive messages of type TMessage anymore with the given token, but will still receive other message types or messages with other tokens (if it registered for them previously).

The recipient that must be unregistered. The token for which the recipient must be unregistered. The type of messages that the recipient wants to unregister from.

Unregisters a message recipient for a given type of messages and for a given action. Other message types will still be transmitted to the recipient (if it registered for them previously). Other actions that have been registered for the message type TMessage and for the given recipient (if available) will also remain available.

The type of messages that the recipient wants to unregister from. The recipient that must be unregistered. The action that must be unregistered for the recipient and for the message type TMessage.

Unregisters a message recipient for a given type of messages, for a given action and a given token. Other message types will still be transmitted to the recipient (if it registered for them previously). Other actions that have been registered for the message type TMessage, for the given recipient and other tokens (if available) will also remain available.

The type of messages that the recipient wants to unregister from. The recipient that must be unregistered. The token for which the recipient must be unregistered. The action that must be unregistered for the recipient and for the message type TMessage.

Base class for all messages broadcasted by the Messenger. You can create your own message types by extending this class.

Initializes a new instance of the MessageBase class.

The message's original sender.

Initializes a new instance of the MessageBase class.

The message's original sender. The message's intended target. This parameter can be used to give an indication as to whom the message was intended for. Of course this is only an indication, amd may be null.

Gets or sets the message's sender.

Gets or sets the message's intended target. This property can be used to give an indication as to whom the message was intended for. Of course this is only an indication, amd may be null.

The Messenger is a class allowing objects to exchange messages.

Gets the Messenger's default instance, allowing to register and send messages in a static manner.

The type of message that the recipient registers for. The recipient that will receive the messages. The action that will be executed when a message of type TMessage is sent. IMPORTANT: If the action causes a closure, you must set keepTargetAlive to true to avoid side effects. If true, the target of the Action will be kept as a hard reference, which might cause a memory leak. You should only set this parameter to true if the action is using closures. See http://galasoft.ch/s/mvvmweakaction.

The type of message that the recipient registers for. The recipient that will receive the messages. A token for a messaging channel. If a recipient registers using a token, and a sender sends a message using the same token, then this message will be delivered to the recipient. Other recipients who did not use a token when registering (or who used a different token) will not get the message. Similarly, messages sent without any token, or with a different token, will not be delivered to that recipient. If true, message types deriving from TMessage will also be transmitted to the recipient. For example, if a SendOrderMessage and an ExecuteOrderMessage derive from OrderMessage, registering for OrderMessage and setting receiveDerivedMessagesToo to true will send SendOrderMessage and ExecuteOrderMessage to the recipient that registered. Also, if TMessage is an interface, message types implementing TMessage will also be transmitted to the recipient. For example, if a SendOrderMessage and an ExecuteOrderMessage implement IOrderMessage, registering for IOrderMessage and setting receiveDerivedMessagesToo to true will send SendOrderMessage and ExecuteOrderMessage to the recipient that registered. The action that will be executed when a message of type TMessage is sent. IMPORTANT: If the action causes a closure, you must set keepTargetAlive to true to avoid side effects. If true, the target of the Action will be kept as a hard reference, which might cause a memory leak. You should only set this parameter to true if the action is using closures. See http://galasoft.ch/s/mvvmweakaction.

The type of message that the recipient registers for. The recipient that will receive the messages. If true, message types deriving from TMessage will also be transmitted to the recipient. For example, if a SendOrderMessage and an ExecuteOrderMessage derive from OrderMessage, registering for OrderMessage and setting receiveDerivedMessagesToo to true will send SendOrderMessage and ExecuteOrderMessage to the recipient that registered. Also, if TMessage is an interface, message types implementing TMessage will also be transmitted to the recipient. For example, if a SendOrderMessage and an ExecuteOrderMessage implement IOrderMessage, registering for IOrderMessage and setting receiveDerivedMessagesToo to true will send SendOrderMessage and ExecuteOrderMessage to the recipient that registered. The action that will be executed when a message of type TMessage is sent. IMPORTANT: If the action causes a closure, you must set keepTargetAlive to true to avoid side effects. If true, the target of the Action will be kept as a hard reference, which might cause a memory leak. You should only set this parameter to true if the action is using closures. See http://galasoft.ch/s/mvvmweakaction.

Sends a message to registered recipients. The message will reach all recipients that registered for this message type using one of the Register methods.

The type of message that will be sent. The message to send to registered recipients.

Sends a message to registered recipients. The message will reach only recipients that registered for this message type using one of the Register methods, and that are of the targetType.

The type of message that will be sent. The type of recipients that will receive the message. The message won't be sent to recipients of another type. The message to send to registered recipients.

Sends a message to registered recipients. The message will reach only recipients that registered for this message type using one of the Register methods, and that are of the targetType.

Unregisters a messager recipient completely. After this method is executed, the recipient will not receive any messages anymore.

The recipient that must be unregistered.

The recipient that must be unregistered. The type of messages that the recipient wants to unregister from.

The recipient that must be unregistered. The token for which the recipient must be unregistered. The type of messages that the recipient wants to unregister from.

The type of messages that the recipient wants to unregister from. The recipient that must be unregistered. The action that must be unregistered for the recipient and for the message type TMessage.

Provides a way to override the Messenger.Default instance with a custom instance, for example for unit testing purposes.

The instance that will be used as Messenger.Default.

Sets the Messenger's default (static) instance to null.

Provides a non-static access to the static method. Sets the Messenger's default (static) instance to null.

Notifies the Messenger that the lists of recipients should be scanned and cleaned up. Since recipients are stored as , recipients can be garbage collected even though the Messenger keeps them in a list. During the cleanup operation, all "dead" recipients are removed from the lists. Since this operation can take a moment, it is only executed when the application is idle. For this reason, a user of the Messenger class should use instead of forcing one with the method.

Scans the recipients' lists for "dead" instances and removes them. Since recipients are stored as , recipients can be garbage collected even though the Messenger keeps them in a list. During the cleanup operation, all "dead" recipients are removed from the lists. Since this operation can take a moment, it is only executed when the application is idle. For this reason, a user of the Messenger class should use instead of forcing one with the method.

Passes a string message (Notification) to a recipient. Typically, notifications are defined as unique strings in a static class. To define a unique string, you can use Guid.NewGuid().ToString() or any other unique identifier.

Initializes a new instance of the NotificationMessage class.

A string containing any arbitrary message to be passed to recipient(s)

Initializes a new instance of the NotificationMessage class.

The message's sender. A string containing any arbitrary message to be passed to recipient(s)

Initializes a new instance of the NotificationMessage class.

The message's sender. The message's intended target. This parameter can be used to give an indication as to whom the message was intended for. Of course this is only an indication, amd may be null. A string containing any arbitrary message to be passed to recipient(s)

Gets a string containing any arbitrary message to be passed to recipient(s).

Provides a message class with a built-in callback. When the recipient is done processing the message, it can execute the callback to notify the sender that it is done. Use the method to execute the callback.

Initializes a new instance of the class.

An arbitrary string that will be carried by the message. The callback method that can be executed by the recipient to notify the sender that the message has been processed.

Initializes a new instance of the class.

The message's sender. An arbitrary string that will be carried by the message. The callback method that can be executed by the recipient to notify the sender that the message has been processed.

Initializes a new instance of the class.

The message's sender. The message's intended target. This parameter can be used to give an indication as to whom the message was intended for. Of course this is only an indication, amd may be null. An arbitrary string that will be carried by the message. The callback method that can be executed by the recipient to notify the sender that the message has been processed.

Executes the callback that was provided with the message.

The type of the callback method's only parameter.

Initializes a new instance of the class.

An arbitrary string that will be carried by the message. The callback method that can be executed by the recipient to notify the sender that the message has been processed.

Initializes a new instance of the class.

The message's sender. An arbitrary string that will be carried by the message. The callback method that can be executed by the recipient to notify the sender that the message has been processed.

Initializes a new instance of the class.

The message's sender. The message's intended target. This parameter can be used to give an indication as to whom the message was intended for. Of course this is only an indication, amd may be null. An arbitrary string that will be carried by the message. The callback method that can be executed by the recipient to notify the sender that the message has been processed.

Executes the callback that was provided with the message.

A parameter requested by the message's sender and providing additional information on the recipient's state.

Passes a string message (Notification) and a generic value (Content) to a recipient.

The type of the Content property.

Initializes a new instance of the NotificationMessage class.

A value to be passed to recipient(s). A string containing any arbitrary message to be passed to recipient(s)

Initializes a new instance of the NotificationMessage class.

The message's sender. A value to be passed to recipient(s). A string containing any arbitrary message to be passed to recipient(s)

Initializes a new instance of the NotificationMessage class.

The message's sender. The message's intended target. This parameter can be used to give an indication as to whom the message was intended for. Of course this is only an indication, amd may be null. A value to be passed to recipient(s). A string containing any arbitrary message to be passed to recipient(s)

Gets a string containing any arbitrary message to be passed to recipient(s).

Initializes a new instance of the class.

An arbitrary string that will be carried by the message. The callback method that can be executed by the recipient to notify the sender that the message has been processed.

Initializes a new instance of the class.

The message's sender. An arbitrary string that will be carried by the message. The callback method that can be executed by the recipient to notify the sender that the message has been processed.

Initializes a new instance of the class.

The message's sender. The message's intended target. This parameter can be used to give an indication as to whom the message was intended for. Of course this is only an indication, amd may be null. An arbitrary string that will be carried by the message. The callback method that can be executed by the recipient to notify the sender that the message has been processed.

Executes the callback that was provided with the message with an arbitrary number of parameters.

A number of parameters that will be passed to the callback method. The object returned by the callback method.

Passes a string property name (PropertyName) and a generic value ( and ) to a recipient. This message type can be used to propagate a PropertyChanged event to a recipient using the messenging system.

The type of the OldValue and NewValue property.

Initializes a new instance of the class.

The message's sender. The property's value before the change occurred. The property's value after the change occurred. The name of the property that changed.

Initializes a new instance of the class.

The property's value before the change occurred. The property's value after the change occurred. The name of the property that changed.

Initializes a new instance of the class.

The message's sender. The message's intended target. This parameter can be used to give an indication as to whom the message was intended for. Of course this is only an indication, amd may be null. The property's value before the change occurred. The property's value after the change occurred. The name of the property that changed.

Gets the value that the property has after the change.

Gets the value that the property had before the change.

Basis class for the class. This class allows a recipient to register for all PropertyChangedMessages without having to specify the type T.

Initializes a new instance of the class.

The message's sender. The name of the property that changed.

Initializes a new instance of the class.

The name of the property that changed.

Gets or sets the name of the property that changed.

A base class for objects of which the properties must be observable.

Occurs after a property value changes.

Provides access to the PropertyChanged event handler to derived classes.

Verifies that a property name exists in this ViewModel. This method can be called before the property is used, for instance before calling RaisePropertyChanged. It avoids errors when a property name is changed but some places are missed.

This method is only active in DEBUG mode. The name of the property that will be checked.

Raises the PropertyChanged event if needed.

If the propertyName parameter does not correspond to an existing property on the current class, an exception is thrown in DEBUG configuration only. (optional) The name of the property that changed.

Raises the PropertyChanged event if needed.

The type of the property that changed. An expression identifying the property that changed.

Extracts the name of a property from an expression.

The type of the property. An expression returning the property's name. The name of the property returned by the expression. If the expression is null. If the expression does not represent a property.

Assigns a new value to the property. Then, raises the PropertyChanged event if needed.

The type of the property that changed. An expression identifying the property that changed. The field storing the property's value. The property's value after the change occurred. True if the PropertyChanged event has been raised, false otherwise. The event is not raised if the old value is equal to the new value.

Assigns a new value to the property. Then, raises the PropertyChanged event if needed.

The type of the property that changed. The name of the property that changed. The field storing the property's value. The property's value after the change occurred. True if the PropertyChanged event has been raised, false otherwise. The event is not raised if the old value is equal to the new value.

Assigns a new value to the property. Then, raises the PropertyChanged event if needed.

The type of the property that changed. The field storing the property's value. The property's value after the change occurred. (optional) The name of the property that changed. True if the PropertyChanged event has been raised, false otherwise. The event is not raised if the old value is equal to the new value.

A base class for the ViewModel classes in the MVVM pattern.

Initializes a new instance of the ViewModelBase class.

An instance of a used to broadcast messages to other objects. If null, this class will attempt to broadcast using the Messenger's default instance.

Gets a value indicating whether the control is in design mode (running under Blend or Visual Studio).

Gets a value indicating whether the control is in design mode (running in Blend or Visual Studio).

Gets or sets an instance of a used to broadcast messages to other objects. If null, this class will attempt to broadcast using the Messenger's default instance.

Unregisters this instance from the Messenger class. To cleanup additional resources, override this method, clean up and then call base.Cleanup().

Broadcasts a PropertyChangedMessage using either the instance of the Messenger that was passed to this class (if available) or the Messenger's default instance.

The type of the property that changed. The value of the property before it changed. The value of the property after it changed. The name of the property that changed.

Raises the PropertyChanged event if needed, and broadcasts a PropertyChangedMessage using the Messenger instance (or the static default instance if no Messenger instance is available).

The type of the property that changed. The name of the property that changed. The property's value before the change occurred. The property's value after the change occurred. If true, a PropertyChangedMessage will be broadcasted. If false, only the event will be raised. If the propertyName parameter does not correspond to an existing property on the current class, an exception is thrown in DEBUG configuration only.

Raises the PropertyChanged event if needed, and broadcasts a PropertyChangedMessage using the Messenger instance (or the static default instance if no Messenger instance is available).

The type of the property that changed. An expression identifying the property that changed. The property's value before the change occurred. The property's value after the change occurred. If true, a PropertyChangedMessage will be broadcasted. If false, only the event will be raised.

Assigns a new value to the property. Then, raises the PropertyChanged event if needed, and broadcasts a PropertyChangedMessage using the Messenger instance (or the static default instance if no Messenger instance is available).

The type of the property that changed. An expression identifying the property that changed. The field storing the property's value. The property's value after the change occurred. If true, a PropertyChangedMessage will be broadcasted. If false, only the event will be raised. True if the PropertyChanged event was raised, false otherwise.

The type of the property that changed. The name of the property that changed. The field storing the property's value. The property's value after the change occurred. If true, a PropertyChangedMessage will be broadcasted. If false, only the event will be raised. True if the PropertyChanged event was raised, false otherwise.

The type of the property that changed. The field storing the property's value. The property's value after the change occurred. If true, a PropertyChangedMessage will be broadcasted. If false, only the event will be raised. (optional) The name of the property that changed. True if the PropertyChanged event was raised, false otherwise.

An interface defining how dialogs should be displayed in various frameworks such as Windows, Windows Phone, Android, iOS etc.

Displays information about an error.

The message to be shown to the user. The title of the dialog box. This may be null. The text shown in the only button in the dialog box. If left null, the text "OK" will be used. A callback that should be executed after the dialog box is closed by the user. A Task allowing this async method to be awaited.

Displays information about an error.

The exception of which the message must be shown to the user. The title of the dialog box. This may be null. The text shown in the only button in the dialog box. If left null, the text "OK" will be used. A callback that should be executed after the dialog box is closed by the user. A Task allowing this async method to be awaited.

Displays information to the user. The dialog box will have only one button with the text "OK".

The message to be shown to the user. The title of the dialog box. This may be null. A Task allowing this async method to be awaited.

Displays information to the user. The dialog box will have only one button.

The message to be shown to the user. The title of the dialog box. This may be null. The text shown in the "confirm" button in the dialog box. If left null, the text "OK" will be used. The text shown in the "cancel" button in the dialog box. If left null, the text "Cancel" will be used. A callback that should be executed after the dialog box is closed by the user. The callback method will get a boolean parameter indicating if the "confirm" button (true) or the "cancel" button (false) was pressed by the user. A Task allowing this async method to be awaited. The task will return true or false depending on the dialog result.

Displays information to the user in a simple dialog box. The dialog box will have only one button with the text "OK". This method should be used for debugging purposes.

The message to be shown to the user. The title of the dialog box. This may be null. A Task allowing this async method to be awaited.

An interface defining how navigation between pages should be performed in various frameworks such as Windows, Windows Phone, Android, iOS etc.

The key corresponding to the currently displayed page.

If possible, instructs the navigation service to discard the current page and display the previous page on the navigation stack.

Instructs the navigation service to display a new page corresponding to the given key. Depending on the platforms, the navigation service might have to be configured with a key/page list.

The key corresponding to the page that should be displayed.

Instructs the navigation service to display a new page corresponding to the given key, and passes a parameter to the new page. Depending on the platforms, the navigation service might have to be Configure with a key/page list.

The key corresponding to the page that should be displayed. The parameter that should be passed to the new page.