将变量值从 aspx 链接按钮传递给 ASP 中的代码。 NET 使用 C#

Question

Inside a for loop, how to pass the variable to the code-behind from an asp tag and access the variable value

CommandArgument works but shows <# gigs[x].Id%> - not the value.

Aspx

<%for (int x = 0; x < gigs.Count; x++){%>

<asp:LinkButton ID="LinkButton2" CssClass="btn btn-danger mt-3" runat="server" 
     UseSubmitBehavior="false" CommandArgument="<# gigs[x].Id%>" 
     OnClick="LinkButton2_Click">Hide Gig <i class="fa fa-eye-slash ml-1"></i>
</asp:LinkButton>

Code behind

protected void LinkButton2_Click(object sender, EventArgs e)
{
    LinkButton lnk = sender as LinkButton;
    String Value1 = lnk.CommandArgument;
    Response.Write(Value1);
}

Result

<# gigs[x].Id%>

Expected Result

1

Answer 1

Try using <%# gigs[x].Id %> instead and call Page.DataBind() on the Page_Load event.

<%= %> is a shortened response.Write() and is never valid as an attribute, for any server tag.

<%# %> can be used, only if the container is databound (the page in your case).

Answer 2

You're much better off using a Strongly Typed Repeater. You can set the ItemType as your class gigs and have full access to all it's properties. Then you can easily use them in the LinkButton.

Repeater1.DataSource = gigs;
Repeater1.DataBind();

And then in the aspx

<asp:Repeater ID="Repeater1" runat="server" ItemType="MyNameSpace.MyClass.Gig">
    <ItemTemplate>

        <asp:LinkButton ID="LinkButton2" CommandArgument='<%# Item.Id %>' OnClick="LinkButton2_Click" runat="server">Hide Gig</asp:LinkButton>

    </ItemTemplate>
</asp:Repeater>