c# - Change paste contents in Textbox

Question

How can I dynamically change the contents of what will be pasted in the TextBox.

Here is how I subscribe to the event:

DataObject.AddPastingHandler (uiTextBox, TextBoxPaste);

Here is how I define the event handler:

private void TextBoxPaste (object sender, DataObjectPastingEventArgs args)
{
    string clipboard = args.DataObject.GetData (typeof (string)) as string;

    Regex nonNumeric = new System.Text.RegularExpressions.Regex (@"D");
    string result = nonNumeric.Replace (clipboard, String.Empty);

    // I can't just do "args.DataObject.SetData (result)" here.
}

Answer 1

You cannot call args.DataObject.SetData("some data") since the DataObject is frozen. What you can do is replace the DataObject altogether:

private void TextBoxPaste(object sender, DataObjectPastingEventArgs e) {
        string text = (String)e.DataObject.GetData(typeof(String));
        DataObject d = new DataObject();
        d.SetData(DataFormats.Text, text.Replace(Environment.NewLine, " "));
        e.DataObject = d;
 }