Check if paste into textbox with max length will truncate clipboard contents

Question

I have several textbox fields in my WPF application that have max character lengths set.

The Problem:

If you paste a string that is too long, then it truncates that string to fit the max length.

The Question:

How can I check that on pasting to a textbox control if the character count for contents that is being pasted is greater than the max character length set for that textbox?

Not sure about WPF, but in Windows Forms you would hook the message loop an intercept `WM_PASTE` messages. — User 12345678, Jul 21 '14 at 21:14

score 0 · Accepted Answer · edited May 23 '17 at 11:50

0

Take a look at Paste Event in a WPF TextBox

You can use a solution similar to the accepted answer, where you add a paste handler, and compare the MaxLength of the TextBox to the contents of the clipboard:

var tb = sender as TextBox;
var text = e.SourceDataObject.GetData(DataFormats.Text) as string;
if(text > tb.MaxLength) {
    //Do whatever it is you want to do
}

edited May 23 '17 at 11:50

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answered Jul 21 '14 at 21:22

Troels Larsen

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Check if paste into textbox with max length will truncate clipboard contents

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