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ICommand Interface
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ICommand Interface

Defines a command.

Namespace:  System.Windows.Input
Assemblies:   System (in System.dll)
  System.ObjectModel (in System.ObjectModel.dll)

XMLNS for XAML: Not mapped to an xmlns.

[TypeConverterAttribute("System.Windows.Input.CommandConverter, PresentationFramework, Version=, Culture=neutral, PublicKeyToken=31bf3856ad364e35, Custom=null")]
public interface ICommand
<object property="predefinedCommandName"/>- or -<object property="predefinedCommandName.predefinedCommandName"/>- or -<object property="{x:Static customClassName.customCommandName}"/>

XAML Values


One of the predefined command classes.


One of the predefined commands.


A custom class that contains the custom command. Custom classes generally require an xlmns prefix mapping; see XAML Namespaces and Namespace Mapping for WPF XAML.


A custom command.

The ICommand type exposes the following members.

Public methodSupported by Portable Class LibraryCanExecuteDefines the method that determines whether the command can execute in its current state.
Public methodSupported by Portable Class LibraryExecuteDefines the method to be called when the command is invoked.

Public eventSupported by Portable Class LibraryCanExecuteChangedOccurs when changes occur that affect whether or not the command should execute.

RoutedCommand and RoutedUICommand are two implementations of the ICommand interface in Windows Presentation Foundation (WPF).

ICommand in Windows Runtime apps

The ICommand interface is the code contract for commands that are written in .NET for Windows Runtime apps. These commands provide the commanding behavior for UI elements such as a Windows Runtime XAML Button and in particular an AppBarButton. If you're defining commands for Windows Runtime apps you use basically the same techniques you'd use for defining commands for a .NET app. Implement the command by defining a class that implements ICommand and specifically implement the Execute method.

XAML for Windows Runtime does not support x:Static, so don't attempt to use the x:Static markup extension if the command is used from Windows Runtime XAML. Also, the Windows Runtime does not have any predefined command libraries, so the XAML syntax shown here doesn't really apply for the case where you're implementing the interface and defining the command for Windows Runtime usage.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Portable Class Library

Supported in: Portable Class Library
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