ICommand Interface
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ICommand Interface


Defines a command.

Namespace:   System.Windows.Input
Assembly:  System (in System.dll)

[TypeConverterAttribute("System.Windows.Input.CommandConverter, PresentationFramework, Version=, Culture=neutral, PublicKeyToken=31bf3856ad364e35, Custom=null")]
public interface ICommand


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


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


Occurs 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).

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 M:System.Windows.Input.ICommand.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.

<object property="predefinedCommandName"/>

- or -

<object property="predefinedCommandName.predefinedCommandName"/>

- or -

<object property="{ customClassName.customCommandName}"/>


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.

Universal Windows Platform
Available since 4.5
.NET Framework
Available since 3.0
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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