如何从wpf中的另一个窗口访问一个窗口的控件（richtextbox）？

Question

I'm sure this is something very simple but I can't figure it out. I've searched here and on msdn and have been unable to find the answer. I need to be able to set the richtextboxes selection via richtextbox.Selection.Select(TextPointer1, Textpointer2).

Answer 1

Application.Current contains a collection of all windows in you application, you can get the other window with a query such as

var window2 = Application.Current.Windows
    .Cast<Window>()
    .FirstOrDefault(window => window is Window2) as Window2;

and then you can reference the control from your code, as in

var richText = window2.MyRichTextBox

Answer 2

Application.Current.Windows.OfType(Of MainWindow).First

Answer 3

You cant access the texbox from another window as it is private to that window you can however work around this by exposing the RichTextBox as a public property on your window (hack)

public RichTextBox RichTextBox {
  get{
    //the RichTextBox would have a property x:Name="richTextbox" in the xaml
    return richTextBox;
  }
}

Answer 4

You should be able to access controls on Window1 from Window2 code behind, if that's what you want. Generated fields are internal by default .

All you need is to name the control on Window1 , like this:

<RichTextBox x:Name="richtextbox" ... />

In Window2 code behind:

var window = new Window1(); // or use the existing instance of Window1
window.richtextbox.Selection.Select(TextPointer1, Textpointer2);

A better option would be to encapsulate select operation in a method in code behind of Window1, to avoid giving away internal. Then you would have:

// Window1.cs
public void Select(int param1, int param2)
{
    richtextbox.Selection.Select(param1, param2);
}

// Window2.cs
var window = new Window1(); // or use the existing instance of Window1
window.Select(TextPointer1, Textpointer2);