键绑定-RelayCommand在xaml.cs中

Question

I bind my textboxes to ViewModel class. But, button command (it's a RelayCommand, extended from ICommand) I bind to UsersView.xaml.cs. In UsersView.xaml.cs constructor I have this:

DataContext = UserVM;
btnAdd.DataContext = this;

This is how I bind button - it works.

<Button Command="{Binding Add}" Content="Add user" />

Now, I want to add KeyGesture for that button but I can't set DataContext for InputBindings and compiler can't find this Add command in UsersVM class.

<UsersView.InputBindings>
    <KeyBinding Key="F10" Command="{Binding Add}" />
</UsersView.InputBindings>

Answer 1

I had this on a Window and this is the code I used...

<Window
   x:Class="MVVMExample.MainWindow"
   xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
   xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
   xmlns:myViewModels="clr-namespace:MVVMExample"
   Title="MainWindow"
   x:Name="MyMainWindow"
   Height="350"
   Width="525">

Notice that I set the x.Name of the Window. Then in my KeyBinding, I did this...

<Window.InputBindings>

    <KeyBinding
        Key="F10"
        Command="{Binding ElementName=MyMainWindow, Path=DataContext.AddPersonCommand}" />

</Window.InputBindings>

The AddPersonCommand is my ICommand from my ViewModel.