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PODataGridView selection change doesn't show until the SelectionChanged event handler has completed
 

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  1. PODataGridView selection change doesn't show until the SelectionChanged event handler has completed
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    <p>I'm catching the DataGridView control's SelectionChanged event and my event handler takes about 1/2 a second to complete its task (setting the values of several controls, etc.). In UI terms, that's an eternity.</p> <p>The problem is that the DataGridView's user interface doesn't update the selection immediately. What I want is for the user to see the selection change in the DataGridView as soon as they click and <strong><em>then</em></strong> the lengthy work to be done. It will still take 1/2 a second to complete the whole task and the UI will not be responsive during that time, and that's OK -- at least the user will get immediate feedback.</p> <p>You can see this behaviour by inserting the following code into a new Form1 class:</p> <pre><code> private System.Windows.Forms.DataGridView dataGridView1; public Form1() { InitializeComponent(); dataGridView1 = new DataGridView(); dataGridView1.Dock = DockStyle.Fill; dataGridView1.Columns.Add("Column0", "Column 0"); dataGridView1.Rows.Add("Row 0"); dataGridView1.Rows.Add("Row 1"); dataGridView1.Rows.Add("Row 2"); dataGridView1.Rows.Add("Row 3"); dataGridView1.SelectionChanged += new EventHandler(dataGridView1_SelectionChanged); this.Controls.Add(dataGridView1); } private void dataGridView1_SelectionChanged(object sender, EventArgs e) { if (this.Handle != null) { this.DoSomethingForAWhile(); // Even BeginInvoke doesn't help //this.BeginInvoke((MethodInvoker)this.DoSomethingForAWhile); } } private void DoSomethingForAWhile() { // Do anything that causes a noticable delay DateTime t0 = DateTime.Now; while ((DateTime.Now - t0).TotalSeconds &lt; 2) { // Do nothing } } </code></pre> <p>I would normally use Control.BeginInvoke so that the paint messages could be processed before my 1/2 second task starts. This works with a ListView control but for some reason it doesn't work with DataGridView.</p> <p>I <em>could</em> do the processing on another thread and use Invoke to set the UI values, but that seems like a lot of complexity for something that <em>should</em> be a simple task.</p> <p>Surely there's a better way.</p>
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