Convert controls dynamically from strings

Question

I want to disable some controls on my asp page from a ControlCollection.

This is my code.

foreach (System.Web.UI.Control c in ControlCollection)
{
   if (c.GetType().FullName.Equals("System.Web.UI.WebControls.Table"))
   {
        TableRow t = (TableRow)c;
        t.Enabled = false;
   }
   else if (c.GetType().FullName.Equals("System.Web.UI.WebControls.TextBox"))
   {
        TextBox t = (TextBox)c;
        t.Enabled = false;
   }
  .......
  ......
  ///Like this I do for all controls
}

I need a better approach at this. I searched on Internet but didn't find any solution.

user447356 · Accepted Answer · 2013-05-21 08:40:27Z

1

You can use the .OfType<> extension like this in order to have more elegant code:

collection.OfType<Table>().ToList().ForEach(c => c.Enabled = false);
collection.OfType<TextBox>().ToList().ForEach(c => c.Enabled = false)

answered May 21, 2013 at 8:40

user447356

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Comments

Raimond Kuipers · Accepted Answer · 2013-05-21 10:28:46Z

0

Do all controls in your list inherit from System.Web.UI.WebControl? If so, than this code may help. (Didn't test it myself)

Type wc = new System.Web.UI.WebControls.WebControl(HtmlTextWriterTag.A).GetType();

    foreach (System.Web.UI.Control c in ControlCollection)
    {
        if (c.GetType().IsSubclassOf(wc))
        {
            ((System.Web.UI.WebControls.WebControl)c).Enabled = false;
        }
    }

And even more elegant (thanx to Shadow Wizard )

ControlCollection.OfType<System.Web.UI.WebControls.WebControl>().ToList().ForEach(c => c.Enabled = false);

edited May 21, 2013 at 10:28

answered May 21, 2013 at 8:31

Raimond Kuipers

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3 Comments

user1032317 Over a year ago

Yes this is what i want to do. All my controls are web controls. But I get these errors for which I need your help. If I write Type wc = GetType(new System.UI.WebControl()); I get error saying UI does not exist in System. If I write Type wc = new System.Web.UI.WebControls.WebControl().GetType(); It says WebControl is inaccessible due to its protection level.

Raimond Kuipers Over a year ago

I have edited my code. This code works. One reminder: the controlcollection of a page does only contain the first level of controls. Controls such as a panel will have their own set of childcontrols.

user1032317 Over a year ago

Thanks..This saved me lots of coding and I got to learn something new. :)

LukeHennerley · Accepted Answer · 2013-05-21 08:21:21Z

0

Try to use is.

if (c is Table)
{

}
else if (c is TextBox)
{

}

Or consider doing a switch statement on the type name.

switch (c.GetType().Name.ToLower())
{
  case "table":
    break;
  case "textbox":
    break;
}

answered May 21, 2013 at 8:21

LukeHennerley

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