How to stop TextBox_Leave event code from running

Ger Cannoll — Wed, 13 Apr 2011 14:41:49 GMT

I have a form with a SearchTextBox on it, the only purpose of the SearchtextBox is to enter some text, then do a search, and populate other textBoxes on the form when you return from the search----- All working fine. The Search Results in a Grid being displayed, and a record can be selected.

I have the code to do the search on the SearchTextBox_Leave event.

My only probelm is that, if I have focus on the SearchTextBox, and I click on the X of the form to close the form, the Form Closes , but leaves a dangling search Grid on the screen, even though the Form itself is gone at this stage.

It probably does not matter , but the Grid happens to be a Devexpress grid which I use to do the searching. Is there a way to prevent the Code in the _Leave event from running, as I dont want it to run if the form has been released

RE: How to stop TextBox_Leave event code from running

Greg McGuffey — Wed, 13 Apr 2011 14:41:49 GMT

The best thing to do is to override the ProcessCmdKey method in the sub-class. You can then run your search only when the user hits the Enter key (and maybe the tab key) within the textbox. Here's some sample code:

[code]public class SearchTextBox
: TextBox
{

public SearchTextBox() : base() { }

/// <summary>
/// Run search if enter is pressed while in the textbox.
/// </summary>
protected override bool ProcessCmdKey( ref Message msg, Keys keyData )
{
    //-- You could also define other keys, such as the tab key here.
    if (keyData == Keys.Enter)
    {
      //-- Run the search
      if (this.SearchFunction != null)
      {
        int count = this.SearchFunction( this.Text );
        MessageBox.Show( string.Format( "{0} items found" );
      }
      else
      {
        //-- Notify develper that they haven't setup a search function.
        MessageBox.Show( string.Format( "No search function defined. Search term is '{0}'", this.Text ) );
      }
    }

    //-- Whatever key is used to run the search
    //   should also just do whatever it normally does.
    return base.ProcessCmdKey( ref msg, keyData );
}

/// <summary>
/// Define the function that runs the search. This
/// function accepts a string search term and return
/// number of items found. You could also use a
/// normal delegate, so you don't have to have a return
/// value.
/// </summary>
public Func<string, int> SearchFunction { get; set; }

/// <summary>
/// Override to always return a string (and never null).
/// </summary>
public override string Text
{
    get
    {
      string text = string.Empty;
      if (!string.IsNullOrEmpty( base.Text ))
      {
        text = base.Text;
      }
      return text;
    }
    set
    {
      base.Text = value;
    }
}
}[/code]

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How to stop TextBox_Leave event code from running

RE: How to stop TextBox_Leave event code from running