Im get the following Error - 'OfType' is not a member of 'System.Web.UI.ControlCollection'

Question

1.00/5 (1 vote)

See more:

Im get the following Error -;OfType; is not a member of System.Web.UI.ControlCollection'

This is the code thats gives the error

VB

Protected Sub dgdWebsite_RowDataBound(sender As Object, e As GridViewRowEventArgs) Handles dgdWebsite.RowDataBound
        Try
            If e.Row.RowType = DataControlRowType.DataRow Then
                Dim item As String = e.Row.Cells(0).Text
                For Each button As Button In e.Row.Cells(7).Controls.OfType(Of Button)()
                    If button.CommandName = &quot;Delete&quot; Then
                        button.Attributes(&quot;onclick&quot;) = &quot;if(!confirm(&#39;Do you want to delete &quot; + item + &quot;?&#39;)){ return false; };&quot;
                    End If
                Next
            End If
        Catch ex As Exception
            ShowErrorMsg(ex.Message)
        End Try

    End Sub

Posted 21-Jul-14 3:57am

marnus20

Updated 12-May-17 18:30pm

Blutfaust

v3

Add a Solution

Comments

Kornfeld Eliyahu Peter 21-Jul-14 10:04am

What version of .NET do you use?

Sergey Alexandrovich Kryukov 21-Jul-14 11:09am

Do you really think it will make any difference? Please see my answer.
—SA

Kornfeld Eliyahu Peter 21-Jul-14 14:41pm

It makes all the difference!
OfType is an extension method that ControlCollection has via IEnumerable but only since version 3.5!!!

Sergey Alexandrovich Kryukov 21-Jul-14 15:16pm

I got it, thank you for answering.
It could be a reason; prior to v.3.5 (or 3.0?) the extension methods themselves are not available. I credited your comments and adjusted my answer accordingly so the problem could be solved even without having the extension method.
—SA

3 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Sergey Alexandrovich Kryukov · Answer 1 · 2014-07-21T04:33:00

There is nothing wonderful if some gibberish written in code cause some compilation error. The method OfType applied to a collection of control is a fruit of your fantasy. There is no such thing, as clearly reported by your compiler.

If you wanted to dynamically sort out some objects based on their runtime types, there are two VB.NET operators, Is and TryCast; their use should be obvious from the MSDN help pages:
http://msdn.microsoft.com/en-us/library/kb136x1y.aspx[^],
http://msdn.microsoft.com/en-us/library/zyy863x8.aspx[^].

As to your OfType, there is a generic method System.Linq.Enumerable.OfType<>:
http://msdn.microsoft.com/en-us/library/vstudio/bb360913%28v=vs.100%29.aspx[^].

If you have the version of .NET where it is implemented (please see the comment to the question, thanks to Kornfeld Eliyahu Peter), you can use this method with your collection to System.IEnumerable.

These CodeProject articles could be useful:
Extension Methods in .NET[^],
Extension Methods in VB.NET[^].

But ultimately, in the implementation of the filtering in such a method you would still need to use the Is operator. :-)

—SA

marnus20 · Answer 2 · 2014-07-21T22:03:00

VB

If e.Row.RowState <> DataControlRowState.Edit Then
               If e.Row.RowType = DataControlRowType.DataRow Then
                   Dim id As String = e.Row.Cells(0).Text
                   Dim lb As ImageButton = DirectCast(e.Row.Cells(6).Controls(0), ImageButton)

                   If lb IsNot Nothing Then
                       lb.Attributes("onclick") = "if(!confirm('Do you want to delete " + id + "?')){ return false; };"
                   End If
                   Dim Sel As ImageButton = DirectCast(e.Row.Cells(7).Controls(0), ImageButton)
                   If Sel IsNot Nothing Then
                       Dim path As String = e.Row.Cells(4).Text
                       Sel.Attributes("onclick") = "window.open('" + path + "','_blank');"
                   End If
               End If
           End If

Member 12503655 · Answer 3 · 2017-05-12T18:30:00

Solution 3

Try to import library

Imports System.Web.UI.ControlCollection
Imports System.Linq

I try doint it ,It is work.

Posted 12-May-17 18:30pm

Member 12503655

Im get the following Error - 'OfType' is not a member of 'System.Web.UI.ControlCollection'

3 solutions

Solution 1

Solution 2

Solution 3

Add your solution here

Preview 0