WPF: how can we restrict TextBox only allow entry 25 Characters?

Question

I am using Maxlength property of textbox in WPF UWP Windows app. This property is working on laptop in both PC and tablet mode but it is not working on touchscreen tablet.

How to implement maxlength peroperty for touchscreen tablet. Please suggest.

Answer 1

Hello @Shweta Goel , Welcome to Microsoft Q&A,

During the testing, Maxlength property could work in touchscreen tablet device, please check if set the correct Maxlength value for the application. And if you want to delete text manually when the text length long than the Maxlength , you could use the InputInjector to delete it.

private void TextBox_TextChanging(TextBox sender, TextBoxTextChangingEventArgs args)  
{  
      
    if (sender.Text.Length > 15)  
    {  
  
        InputInjector inputInjector = InputInjector.TryCreate();  
        var info = new InjectedInputKeyboardInfo();  
        info.VirtualKey = (ushort)(VirtualKey.Back);  
        inputInjector.InjectKeyboardInput(new[] { info });  
  
    }  
  
}  

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