Calling a method from Linkbutton in DataList

swifty_programmer · July 27th, 2007, 03:38 AM

Hi all,

I'm trying to find the best way to call a method (defined in CodeBehind) from a linkbutton in a DataList.

An example to clear things up:

DATALIST:

ID NAME
----------------------
123 Mercedes
124 Opel
125 Chevrolet

The linkbutton is for each row the name (Linkbutton1: "Mercedes" ...)
When you click on the linkbutton Mercedes I want to do some work in my code with "123" & "Mercedes" as parameters.

this is the sourcecode:(does not work)

Code:

<asp:DataList ID="_dlCompanyList" runat="server" style="z-index: 106; left: 1px; position: absolute; top: 3px" BackColor="White" BorderColor="#E7E7FF" BorderStyle="None" BorderWidth="1px" CellPadding="3" GridLines="Horizontal" ShowFooter="False" ShowHeader="False" Width="95%">
            <ItemTemplate>
                <asp:Label ID="_lBullet" runat="server" Text="â¢" Width="5px"></asp:Label>
                <asp:LinkButton ID="LinkButton1" runat="server" Width="100px" Text='<%# Eval("Name") %>' OnClick="CompanyClick( Eval("Id") )"></asp:LinkButton>
<asp:Label ID="_lCompanyVersion" runat="server" Width="20px" Text='<%# Eval("Version") %>'></asp:Label>
            </ItemTemplate>
            <FooterStyle BackColor="#B5C7DE" ForeColor="#4A3C8C" />
            <SelectedItemStyle BackColor="#738A9C" Font-Bold="True" ForeColor="#F7F7F7" />
            <AlternatingItemStyle BackColor="#F7F7F7" />
            <ItemStyle BackColor="#E7E7FF" Font-Size="Small" ForeColor="#4A3C8C" />
            <HeaderStyle BackColor="#4A3C8C" Font-Bold="True" ForeColor="#F7F7F7" />
        </asp:DataList>

And this the method in the codebehind:

Code:

        public void CompanyClick(Object sender, EventArgs e, string companyId)
        {
           //do some work with companyId
        }

I read you can do something with OnCommand and CommandArgs in the Source Code but I'm realy looking for the best solution here.
thx in advance for any help.

grtz

Imar · July 28th, 2007, 05:32 AM

Hi there,

You can indeed use the CommandArgument. For example, add this LinkButton in the markup:

Code:

<asp:LinkButton ID="LinkButton1" runat="server" Text='<%# Eval("Name") %>' 
     OnClick="LinkButton1_Click" CommandArgument='<%# Eval("Id") %>' />

This binds the company ID to the CommandArgument of the LinkButton. You can then retrieve it like this in the code behind:

Code:

protected void LinkButton1_Click(object sender, EventArgs e)

Code:

{
  LinkButton myButton = sender as LinkButton;
  if (myButton != null)
  {
    int id = Convert.ToInt32(myButton.CommandArgument);
  }
}

The sender holds a reference to the LinkButton that triggered the event handler. You can cast the object into a LinkButton and then retrieve its CommandArgument and cast that into an int.

Hope this helps,

Imar

---------------------------------------
Imar Spaanjaars
http://Imar.Spaanjaars.Com
Everyone is unique, except for me.
Author of ASP.NET 2.0 Instant Results and Beginning Dreamweaver MX / MX 2004
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