Asp.net Web Forms GridView Dynamic Column Issue

Question

User-2097784254 posted

Hi,

We have a .Net Web Form application with 4.7.2 version.
When we insert column programmaticaly to GridView component, TemplateFields not rendering after postback.
We found a topic about that issue. I think this is a .Net framework bug. There is a feedback url on the post but I couldn't open that page.

FeedBack url:

https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=104994&wa=wsignin1.0

Topic url:

https://forums.asp.net/t/1102255.aspx?GridView+Columns+Insert+Problems

Example Code:

Aspx->

<asp:Content ID="BodyContent" ContentPlaceHolderID="MainContent" runat="server">
   <asp:GridView ID="TestGrid" runat="server" AutoGenerateColumns="false">
       <Columns>
           <asp:BoundField HeaderText="Col1" DataField="Name" />
           <asp:TemplateField>
               <HeaderTemplate>
                   <asp:Label ID="Col2HeaderLabel" runat="server" Text="Col2"></asp:Label>
               </HeaderTemplate>
               <ItemTemplate>
                   <asp:CheckBox ID="Col2CheckBox" runat="server" />
               </ItemTemplate>
           </asp:TemplateField>
           <asp:BoundField HeaderText="Col3" DataField="Surname" />
       </Columns>
   </asp:GridView>

    <asp:Button ID="TestButton" runat="server" Text="Test" />
</asp:Content>

Aspx.cs ->

 protected override void OnInit(EventArgs e)
        {
            base.OnInit(e);

            TestGrid.Columns.Insert(0,new BoundField { HeaderText = "Dynamic Col", DataField = "Description" });
        }

        protected void Page_Load(object sender, EventArgs e)
        {
            TestGrid.DataSource = GetList();
            TestGrid.DataBind();
        }

        private List<Info> GetList()
        {
            List<Info> list = new List<Info>();
            list.Add(new Info { Description = "Row 1", Name = "Name 1", Surname = "Surname 1" });
            list.Add(new Info { Description = "Row 2", Name = "Name 2", Surname = "Surname 2" });
            list.Add(new Info { Description = "Row 3", Name = "Name 3", Surname = "Surname 3" });

            return list;
        }
    }

    public class Info
    {
        public string Name { get; set; }
        public string Surname { get; set; }
        public string Description { get; set; }
    }

Answer 1

User-943250815 posted

I the mean time what about, make gridview with additional column and show/hide such column as you need on Gridview.Databound event

Answer 2

User1535942433 posted

Hi yondersever,

Accroding to your description,I suggest you could post your codes to us.It will help us to solve your problem.

As far as I think, you need to loop through the DataTable, then according the DataColumns to create columns in GridView. You could use the following code to get column name from Table.

Example:

https://forums.asp.net/t/2055073.aspx?Gridview+with+Dynamic+Columns+and+Template+fields

There is a feedback url on the post but I couldn't open that page.

In the article,It have some solution of Microsoft Connect. The community feedback feature of the Microsoft Connect site for SQL Server has been replicated to the SQL Server section of the Azure Feedback Forums.

1.System Center Configuration Manager and Microsoft Intune (Connect Site ID 892)

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The updated website and downloadable materials can be found at https://aka.ms/PoweredDevice-FTprograms.

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7.DevDiv / Visual Studio and .NET Framework (Connect Site ID 210)

We have reviewed and migrated bugs to Developer Community. For VC++ issues, please search the Developer Community site for C++ for your ConnectID or the substring of the bug title, found in an an automated email you received from the original Connect system. Please bear with us as we go through the process of triaging these issues for the new system. If you cannot locate your report, please contact [e-mail].

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Best regards,

Yijing Sun