How do I add a custom routed command in WPF?

I use a static class that I place after the Window1 class (or whatever the window class happens to be named) where I create instances of the RoutedUICommand class:

public static class Command {    public static readonly RoutedUICommand DoSomething = new RoutedUICommand("Do something", "DoSomething", typeof(Window1));    public static readonly RoutedUICommand SomeOtherAction = new RoutedUICommand("Some other action", "SomeOtherAction", typeof(Window1));    public static readonly RoutedUICommand MoreDeeds = new RoutedUICommand("More deeds", "MoreDeeeds", typeof(Window1));}

Add a namespace in the window markup, using the namespace that the Window1 class is in:

xmlns:w="clr-namespace:NameSpaceOfTheApplication"

Now I can create bindings for the commands just as for the application commands:

<Window.CommandBindings>    <CommandBinding Command="ApplicationCommands.Open" Executed="CommandBinding_Open" />    <CommandBinding Command="ApplicationCommands.Paste" Executed="CommandBinding_Paste" />    <CommandBinding Command="w:Command.DoSomething" Executed="CommandBinding_DoSomething" />    <CommandBinding Command="w:Command.SomeOtherAction" Executed="CommandBinding_SomeOtherAction" />    <CommandBinding Command="w:Command.MoreDeeds" Executed="CommandBinding_MoreDeeds" /></Window.CommandBindings>

And use the bindings in a menu for example:

<MenuItem Name="Menu_DoSomething" Header="Do Something" Command="w:Command.DoSomething" />

Instead of defining them in a static class, you might as well declare the commands directly in XAML. Example (adapted from Guffas nice example):

<Window.Resources>    <RoutedUICommand x:Key="DoSomethingCommand" Text="Do Something" />    <RoutedUICommand x:Key="DoSomethingElseCommand" Text="Do Something Else" /></Window.Resources><Window.CommandBindings>    <CommandBinding Command="{StaticResource DoSomethingCommand}" Executed="CommandBinding_DoSomething" />    <CommandBinding Command="{StaticResource DoSomethingElseCommand}" Executed="CommandBinding_DoSomethingElse" /></Window.CommandBindings>...<MenuItem Name="Menu_DoSomething" Header="Do Something" Command="{StaticResource DoSomethingCommand}" />

I Know that my answer is too late, but i hope it will help for the future.

I Like Guffa and Heinzi answers, but you can use only one command to achieve the previous result.I usually use the Help command

 <Window.CommandBindings>        <CommandBinding Command="{StaticResource Help}" Executed="HelpExecuted" />  </Window.CommandBindings>

and I use CommandParametr with each call e.g

<Window.InputBindings>    <KeyBinding Command="{StaticResource Help}" Key="A" Modifiers="Ctrl" CommandParameter="Case1"/>    <KeyBinding Command="{StaticResource Help}" Key="B" Modifiers="Ctrl" CommandParameter="Case2"/>    <KeyBinding Command="{StaticResource Help}" Key="C" Modifiers="Ctrl" CommandParameter="Case3"/>    <KeyBinding Command="{StaticResource Help}" Key="D" Modifiers="Ctrl" CommandParameter="Case4"/>    <MouseBinding Command="{StaticResource Help}" MouseAction="LeftDoubleClick" CommandParameter="Case5" /></Window.InputBindings>

or

<Button Command="Help" CommandParameter="Case6" Content="Button">    <Button.InputBindings>        <KeyBinding Command="{StaticResource Help}" Gesture="Ctrl+D" CommandParameter="Case7"/>    </Button.InputBindings></Button>

and in the cs file

private void HelpExecuted(object sender, ExecutedRoutedEventArgs e){    string str = e.Parameter as string;    switch (str)    {        case null://F1 Pressed default Help               //Code            break;        case "Case1":               //Code            break;        case "Case2":               //Code            break;        case "Case3":               //Code            break;        case "Case4":            break;        case "Case5":               //Code            break;        case "Case6":               //Code            break;        case "Case7":               //Code            break;    }    e.Handled = true;}

and if you are using MVVM pattern

private void HelpExecuted(object sender, ExecutedRoutedEventArgs e){    string str = e.Parameter as string;    Mvvm_Variable.Action(Input: str);    e.Handled = true;}

and move the switch to ViewModule site. and Action is a method in the same ViewModule class.