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Adding Functionality To .NET Controls

, 7 Aug 2014 CPOL
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This is an alternative for "Adding Functionality To .NET Controls"

Introduction

Demonstrates an event handler to clear the Text of a Control after some timeout period.

Background

The Tip to which I offer this as an alternative deals with wrapping a Control in order to add functionality. But, as I noted in my comment, the particular functionality demonstrated doesn't require wrapping the Control; all it requires is an event handler, which can belong to any class.

The related Tip is a good demonstration of wrapping a Control, but wrapping should probably be a last resort.

Using the code

The static class below provides an event handler suitable for the TextChanged event of any WinForms Control:

label1.TextChanged += TextClearer.ClearText ;

Later in the application the Control may have its Text changed to some value:

label1.Text = "Done" ;

The Interval defaults to five seconds, but it can be changed as needed. The Interval value in place when the event handler is called will be used.

TextClearer.Interval = 10 ;

TextClearer: A static class that simply provides an event handler

This is a very simply class, with only the minimum features required for this simple demonstration.

public static partial class TextClearer
{
  public static int Interval = 5 ;

  public static void
  ClearText
  (
    object           control
  ,
    System.EventArgs textchanged
  )
  {
    System.Windows.Forms.Control c = control as System.Windows.Forms.Control ;

    if ( ( Interval > 0 ) && ( c != null ) && ( c.Text.Length > 0 ) )
    {
      System.Windows.Forms.Timer t = new System.Windows.Forms.Timer()
      {
        Interval = Interval * 1000
      } ;

      t.Tick += delegate
      (
        object           timer
      ,
        System.EventArgs tick
      )
      {
        t.Stop() ;

        c.Text = System.String.Empty ;

        return ;
      } ;

      t.Start() ;
    }

    return ;
  }
}

History

2014-08-07 First submitted

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

PIEBALDconsult
Software Developer (Senior)
United States United States
BSCS 1992 Wentworth Institute of Technology

Originally from the Boston (MA) area. Lived in SoCal for a while. Now in the Phoenix (AZ) area.

OpenVMS enthusiast, ISO 8601 evangelist, photographer, opinionated SOB, acknowledged pedant and contrarian

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QuestionCode style Pin
Carlos19078-Aug-14 1:32
memberCarlos19078-Aug-14 1:32 

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