Enjoyable Blog of Possibilities

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With a simple extension method to ControlCollection to flatten the control tree you can use LINQ to query the control tree:

public static class PageExtensions

{

 public static IEnumerable<Control> All(this ControlCollection controls)

 {

 foreach (Control control in controls)

 {

 foreach (Control grandChild in control.Controls.All())

 yield return grandChild;

 yield return control;

 }

 }

}

Now I can do things like this:

// get the first empty textbox

TextBox firstEmpty = accountDetails.Controls

.All()

.OfType<TextBox>()

.Where(tb => tb.Text.Trim().Length == 0)

.FirstOrDefault();

// and focus it

if (firstEmpty != null)

 firstEmpty.Focus();

.csharpcode,.csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, “Courier New”, courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode.rem { color: #008000; }
.csharpcode.kwrd { color: #0000ff; }
.csharpcode.str { color: #006080; }
.csharpcode.op { color: #0000c0; }
.csharpcode.preproc { color: #cc6633; }
.csharpcode.asp { background-color: #ffff00; }
.csharpcode.html { color: #800000; }
.csharpcode.attr { color: #ff0000; }
.csharpcode.alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode.lnum { color: #606060; }

Pretty cool! I can do all sorts of querying of the control tree now. LINQ you are my h

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ero.

http://weblogs.asp.net/dfindley/archive/2007/06/29/linq-the-uber-findcontrol.aspx