Return custom values from WPF dialog

Question

I am using Window.ShowDialog() method to fetch some values from the user. However, the dialog will only return a nullable bool.

How can I get my WPF window to return a Tuple<string,string> or any other type?

Answer 1

You could add a new method to your Window, something like this:

public Tuple<string, string> ShowTupleDialog()
{
    var retTuple = new  Tuple<string, string>();
    this.ShowDialog();
    // values from dialog to retTuple (maybe use 
    //databinding and return an already defined tuple)
    return retTuple;
}

Answer 2

You don't need to return that value from the ShowDialog method, as explained here: "A Nullable<(Of <(T>)>) value of type Boolean that signifies how a window was closed by the user".

You can simply store the value you want to return in a property or field and get it:

window.ShowDialog();
Tuple<string, string> value = window.InputValue;