Class RelayCommand<T>

Implementation of IRelayCommand that allows for CommandParameter to be passed in.

Inheritance

Object

RelayCommand<T>

Inherited Members

Object.ToString()

Object.Equals(Object)

Object.Equals(Object, Object)

Object.ReferenceEquals(Object, Object)

Object.GetHashCode()

Object.GetType()

Object.MemberwiseClone()

Namespace: Unity.AppUI.MVVM

Syntax

public class RelayCommand<T> : IRelayCommand<T>, IRelayCommand, ICommand

Type Parameters

Name	Description
T	The type of the CommandParameter.

Constructors

RelayCommand(Action<T>)

Initializes a new instance of the RelayCommand<T> class.

Declaration

public RelayCommand(Action<T> execute)

Parameters

Type	Name	Description
Action<T>	execute	The action to execute.

Exceptions

Type	Condition
ArgumentNullException	Thrown if the action is null.

RelayCommand(Action<T>, Predicate<T>)

Initializes a new instance of the RelayCommand<T> class.

Declaration

public RelayCommand(Action<T> execute, Predicate<T> canExecute)

Parameters

Type	Name	Description
Action<T>	execute	The action to execute.
Predicate<T>	canExecute	The predicate executed to determine if the command can execute.

Exceptions

Type	Condition
ArgumentNullException	Thrown if the action or the predicate is null.

Methods

CanExecute(T)

Determines whether this RelayCommand<T> can execute in its current state.

Declaration

public bool CanExecute(T parameter)

Parameters

Type	Name	Description
T	parameter	Data used by the command.

Returns

Type	Description
Boolean	true if this command can be executed; otherwise, false.

Implements

IRelayCommand<T>.CanExecute(T)

CanExecute(Object)

Determines whether this RelayCommand<T> can execute in its current state.

Declaration

public bool CanExecute(object parameter)

Parameters

Type	Name	Description
Object	parameter	Data used by the command.

Returns

Type	Description
Boolean	true if this command can be executed; otherwise, false.

Implements

ICommand.CanExecute(Object)

Exceptions

Type	Condition
InvalidOperationException

Execute(T)

Executes the RelayCommand<T> on the current command target.

Declaration

public void Execute(T parameter)

Parameters

Type	Name	Description
T	parameter	Data used by the command.

Implements

IRelayCommand<T>.Execute(T)

Execute(Object)

Executes the RelayCommand<T> on the current command target.

Declaration

public void Execute(object parameter)

Parameters

Type	Name	Description
Object	parameter	Data used by the command.

Implements

ICommand.Execute(Object)

Exceptions

Type	Condition
InvalidOperationException	Thrown if the parameter is not of type T.

NotifyCanExecuteChanged()

Notifies that the CanExecuteChanged property has changed.

Declaration

public void NotifyCanExecuteChanged()

Implements

IRelayCommand.NotifyCanExecuteChanged()

Events

CanExecuteChanged

Event raised when CanExecute(Object) changes.

Declaration

public event EventHandler CanExecuteChanged

Event Type

Type	Description
EventHandler

Implements

ICommand.CanExecuteChanged