wpf command parameter from other object

Question

I'm wondering how to mark up the XAML for the following. I have a view model with an object based on ICommand.

I have a form with a textbox and a button. The button is hooked to the ICommand object via Command="{Binding MyButtonInViewModel}".

What I want to do is set the button's CommandParameter equal to whatever is in the text of the textbox such as to invoke a "Search", but obviously don't know how to hook across controls in the view.

Answer 1

The following XAML should work to pass the Text from the TextBox as Parameter to your command.

<TextBlock x:Name="searchBox" />

<Button Command="{Binding MyButtonInViewModel}" 
        CommandParameter="{Binding Text, ElementName=searchBox}"/>

Answer 2

You can do this by setting the ElementName in the binding. Here's an example:

<TextBox x:Name="textBox"/>
<Button Content="Button" 
        Command="{Binding ButtonCommand}" 
        CommandParameter="{Binding ElementName=textBox, Path=Text}"/>