CODEWITHSUNDEEP
c#asp.netdetailsview
Melanie
Melanie

Reputation: 3111

How to get Label text from a list of controls

I want to loop through all the controls in an ASP.Net DetailsView and get all the Labels in a List. Then I want to do something to the text of each Label. I'm using the first answer to this question as a guide. It works fine, but I can't access the Text property of the Labels because I'm creating a List of Controls and Controls don't have a Text property. Here's my code:

List<Control> ControlsToCheck = GetAllLabelControls(dvPurchaseOrder).ToList();
foreach (Control c in ControlsToCheck)
{
    c.Text = HighlightSearchTerms(c.Text, Request.QueryString["searchstring"]);
}

public static IEnumerable<Control> GetAllLabelControls(Control parent)
{
    foreach (Control control in parent.Controls)
    {
        if (control is Label)
            yield return control;
        foreach (Control descendant in GetAllLabelControls(control))
        {
            if (descendant is Label)
                yield return descendant;
        }
    }
}

In the debugger, I can see the Text of each Control, but my line

c.Text = HighlightSearchTerms(c.Text, Request.QueryString["searchstring"]);

won't compile:

System.Web.UI.Control does not contain a definition for Text and no extension method accepting a first argument of type System.Web.UI.Control could be found.

BTW, if I use the exact syntax suggested in the link I reference above,

List<Control> ControlsToCheck = GetAllControls(dv).OfType<Label>().ToList();

I get an error message:

Cannot implicitly convert type System.Collections.Generic.List to System.Collections.Generic.List

How can I get the Text of the Labels?

The modified code, which works as per @S.Akbari's answer is to replace

List<Control> ControlsToCheck = GetAllLabelControls(dvPurchaseOrder).ToList();
foreach (Control c in ControlsToCheck)

with

foreach (Label lbl in GetAllLabelControls(dvPurchaseOrder).OfType<Label>().Cast<Label>())

Upvotes: 0

Views: 1410

Answers (1)

Salah Akbari
Salah Akbari

Reputation: 39966

Try this:

foreach (Label lbl in dvPurchaseOrder.Controls.OfType<Label>().Cast<Label>())
{
    lbl.Text = "";//Or other properties of the Label
}

Upvotes: 2

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