How I use the ItemCommand Event for my ListView in my ASP.NET Application

Question

I have a ASP.NET Application with a ListView. In every Row in my ListView I have a LinkButton that open a new webform "Benutzer.aspx". my Problem is that I don't get the Index of this Row. I use the ItemCommand Event but it not work :(

Here my Code:

ASPX:

...

        <ItemTemplate>

            <tr runat="server"> 

                <td align="left" ><asp:Label ID="Label1" Text='<%# Eval("Benutzer") %>' runat="server" /></td>
                <td align="left"><asp:Label ID="Label2" Text='<%# Eval("eMail") %>' runat="server" /></td>
                <td align="left"><asp:Label ID="Label3" Text='<%# Eval("Vorname") %>' runat="server" /></td>
                <td align="left"><asp:Label ID="Label4" Text='<%# Eval("Nachname") %>' runat="server" /></td>
                <td align="left"><asp:Label ID="Label5" Text='<%# Eval("Telefon") %>' runat="server" /></td>

             <td align="left"><asp:LinkButton runat="server" Text="Anzeigen" CommandName="Anzeigen" OnCommand="ListView1_ItemCommand" CommandArgument="myArguments"></asp:LinkButton></td>

            </tr>

        </ItemTemplate>

...

cs file:

...

protected void ListView1_ItemCommand(object sender, ListViewCommandEventArgs e)
        {
            if (e.CommandName == "Anzeigen")
            {
                Label lbText = (Label)e.Item.FindControl("Label2");

               string email = lbText.Text;

               Session["email"] = email;

               Response.Redirect("Benutzer.aspx");

            }
        }

...

What is the matter :(

tarasov

What's the exact problem? My guess is that you cannot find the label is that right? — Jupaol, Jul 23 '12 at 11:09

score 9 · Accepted Answer · edited Jul 24 '12 at 07:59

9

Try this:

First you need to have the index of the button. So in the html code add this in the CommandArgument of the button to get the index:

CommandArgument='<%# Container.DataItemIndex %>'

Then in the codebehind:

if (e.CommandName == "Anzeigen")
{
      Label lbText = ListView1.Item[e.CommandArgument].FindControl("Label2");
      string email = lbText.Text;           

           Session["email"] = email;           

           Response.Redirect("Benutzer.aspx");           
}

Hope I Helped

edited Jul 24 '12 at 07:59

Druid

6,423
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answered Jul 23 '12 at 11:53

Ibrahem Ahmed Shehata

206
1
2
10

Get I a Int DataTyp by Container.DataItemIndex? I get a error by Label lbText = ListView1.Item[(int)e.CommandArgument].FindControl("Label2"); Errortext: The specified cast is not valid. ...but I like your Idea...hope it is a little error ;( – Tarasov Jul 23 '12 at 12:08

score 1 · Answer 2 · edited May 23 '17 at 12:22

You cannot find the control because it is contained in the child control collection of another server control:

<tr runat="server">

You need to try to find the control recursively:

Take a look

Better way to find control in ASP.NET

Or you can use this extension method:

public static class ControlExtensions
{
    public static Control FindControlRecursively(this Control control, string targetControlID)
    {
        if (control == null)
        {
            return null;
        }

        var ctrl = control.FindControl(targetControlID);

        if (ctrl == null)
        {
            foreach (Control child in control.Controls)
            {
                ctrl = FindControlRecursively(child, targetControlID);

                if (ctrl != null)
                {
                    break;
                }
            }
        }

        return ctrl;
    }
}

Usage:

var ctrl = e.Item.FindControlRecursively("your control ID");

what I need for a Namespace for this class? – Tarasov Jul 23 '12 at 11:41 — Tarasov, Jul 23 '12 at 11:41
Now I habe remove runat="server" by tags...and my – Tarasov Jul 23 '12 at 11:50 — Tarasov, Jul 23 '12 at 11:50

score 1 · Answer 3 · edited Jul 22 '13 at 10:58

1

The code you have furnished is simply fine... "just remove the 'CommandArgument' from your listview property , bcoz..its already have the dataindex you are looking for. By specifying a command argument you are overriding the default one. So just remove the command argument and your code will work fine... :)

edited Jul 22 '13 at 10:58

Jimbo

25,790
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answered Jul 22 '13 at 10:42

Ratheesh Raveendran Pillai

43
6

score 1 · Answer 4 · answered Jun 09 '15 at 05:44

I am a VB programmer Check this method may b it gives you some idea

after binding the list with datasource, In the itemCommand do this

Dim <sometext> As Label = TryCast(e.Item.FindControl("Anzeigen"), Label)

    If e.CommandName = "Anzeigen" Then
     'do what ever you like 
     'also you can use <sometext> if you want to extract data from list
     'simply use <sometext>.<whatproperty>, you can also store it in sessions like the email you are using.

         Session("email") = email         

       Response.Redirect("Benutzer.aspx");  
    End If

let me know if it helps you solve your problem.

score 1 · Answer 5 · edited Jul 03 '19 at 19:13

This is the HTML, then build the OnItemCommand.

<asp:ListView ID="lvFiles" runat="server"  DataKeyNames="FileName" OnItemCommand="lvFiles_ItemCommand">
  <ItemTemplate>
    <tr runat="server">
      <td style="width:80px">
        <asp:LinkButton runat="server" 
                        ID="SelectEmployeeButton" 
                        Text="Download File"   
                        CommandName='<%#Eval("FileName")%>'
                        CommandArgument='<%#Eval("FileName")%>' />
      </td> 
    </tr>
  </ItemTemplate>
</asp:ListView>

Here is the code behind...

protected void lvFiles_ItemCommand(object sender, ListViewCommandEventArgs e)
{
    string v = e.CommandArgument.ToString(); 
}

How I use the ItemCommand Event for my ListView in my ASP.NET Application

5 Answers5