Iterating custom controls

[Richard S. Byer]

Here's a simple problem that's eating my lunch:

I need to write a base class method in ASP.NET that will iterate the page
and find all controls of a certain type. The type is a custom web control
that I created. The controls are never found in Page.Controls - instead,
using the debugger, I see them right off of 'this'. As in
'this.myControl1'. 'this' doesn't support iteration, so how can I find
custom controls of a certain interest to me?

Thanks if you can offer any ides,

Rich.

 

[John Saunders]

Here's a simple problem that's eating my lunch:

I need to write a base class method in ASP.NET that will iterate the page
and find all controls of a certain type. The type is a custom web control
that I created. The controls are never found in Page.Controls - instead,
using the debugger, I see them right off of 'this'. As in
'this.myControl1'. 'this' doesn't support iteration, so how can I find
custom controls of a certain interest to me?

You will need to recurse. Go through each control in Page.Controls. If it is
the correct type, then stop. Otherwise, go through each control in that
control...

 

[Richard S. Byer]

Thanks John, but as I said - the controls do not show in Page.Controls, and
recursion does not work with 'this'.

 

[John Saunders]

Thanks John, but as I said - the controls do not show in Page.Controls, and
recursion does not work with 'this'.

Are you saying that there are no controls at all in Page.Controls? Try this:

private void Page_Load(object sender, EventArgs e)
{
Control foundControl = RecursiveFind(Page.Controls);
}

private Control RecursiveFind(ControlCollection controls)
{
foreach (Control control in controls)
{
if (control is MyCustomType)
{
return control;
}
else
{
Control found = RecursiveFind(control.Controls);
if (found != null)
{
return found;
}
}

return null;
}
}

If you need a VB.Net version, please let me know.