动态地添加一个命令按钮到GridView [英] Dynamically adding a command button to a GridView

问题描述

我在与试图将按钮添加到我的网的问题。我的GridView先装载在pageLoad的事件数据。

I'm having an issue with trying to add a button to my grid. My GridView is first loaded with data in the PageLoad event.

我然后取在每一行的第一个单元中的数据，并创建一个按钮，将链接到一个URL。要获取URL，我必须运行在作为参数，第一个单元格中的数据的查询。我在RowDataBound事件在第一次这样做，但触及该查询的每一行是使得它真的很慢。

I'm then taking the data in the first cell of each row, and creating a button that will link to a URL. To get the URL, I have to run a query with the data in the first cell as a parameter. I was doing this in the RowDataBound event at first, but hitting that query for every row was making it really slow.

所以我决定增加一个按钮，当您单击该按钮，将只检索URL。

So I decided to add a button that would retrieve the URL only when you clicked the button.

下面是我的GridView的：

Here's my GridView:

<asp:GridView ID="gvResults" runat="server"
    OnRowDataBound="gvResults_RowDataBound"
    OnRowCommand="gvResults_RowCommand">               
</asp:GridView>    

和我的code：

protected void gvResults_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.DataItem != null)
    {
        LinkButton lb = new LinkButton();
        lb.CommandArgument = e.Row.Cells[0].Text;
        lb.CommandName = "NumClick";
        lb.Text = e.Row.Cells[0].Text;

        e.Row.Cells[0].Controls.Add((Control)lb);
    }
}


protected void gvResults_RowCommand(object sender, CommandEventArgs e)
{
    switch (e.CommandName.ToLower())
    {
        case "numclick":
            string url = GetUrl(e.CommandArgument.ToString());
            Response.Redirect(url);
            break;
        default:
            break;
    }
}

网格生成细，按钮被添加到网格的每一行。但是，当我点击它，在RowCommand事件不火了，页面只是刷新。

The grid generates fine, the button gets added to the grid for each row. But when I click on it, the RowCommand event doesn't fire, and the page just refreshes.

有谁知道问题是什么？

推荐答案

为什么要使用动态按钮呢？您可以轻松地将LinkBut​​ton的直接进入GridView控件的标记（只要你不介意使用模板字段），并会有没有必要与RowDataBound事件陷入混乱。

Why use a dynamic button at all? You can easily put the linkbutton directly into the markup of the gridview (as long as you don't mind using a template field) and there will be no need to mess around with the RowDataBound event.

您的标记将类似于以下内容：

Your markup would look something like the following:

<Columns>
    <asp:TemplateField HeaderText="SomeHeaderText">
            <ItemTemplate>
                <asp:LinkButton ID="lnkBtn" runat="server" CommandName="NumClick" CommandArgument= '<%# (string)Eval("dbValue") %>'  Text='<%# (string)Eval("dbValue") %>'></asp:LinkButton>
            </ItemTemplate>
        </asp:TemplateField>        
    <asp:BoundField></asp:BoundField>
    <asp:BoundField></asp:BoundField>
    <asp:BoundField></asp:BoundField>
</Columns>

---

添加断点到RowCommand事件，并确保你能打到断点。

---

Add breakpoints to the RowCommand event and make sure that you can hit the breakpoints.

问题可能在其他地方。

此外，还要确保你没有数据绑定在回发。

Also, make sure that you're not databinding on postback.

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