c# - 在 gridview 中单击删除按钮/链接时创建警报时出错

Question

我的目标是在我尝试单击 gridview 中的删除按钮时创建一条警告消息。我正在使用 asp.net C#。当我尝试运行我的程序时，我遇到了这个错误:

编译错误说明:编译服务此请求所需的资源期间发生错误。请查看以下特定错误详细信息并适当修改您的源代码。

编译器错误消息:CS0039:无法通过引用转换、装箱转换、拆箱转换、包装转换或空类型转换

来源错误:

第 211 行://如果您将链接(而非图像)作为命令按钮。第 212 行://LinkBut​​ton button = cell as ImageButton；第 213 行:ImageButton button = control as ImageButton;第 214 行:if (button != null && button.CommandName == "Delete")第215行://添加删除确认

---

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        // loop all data rows
        foreach (DataControlFieldCell cell in e.Row.Cells)
        {
            // check all cells in one row
            foreach (Control control in cell.Controls)
            { 
                // Must use LinkButton here instead of ImageButton
                // if you are having Links (not images) as the command button.
                //LinkButton button = cell as ImageButton;
                ImageButton button = control as ImageButton;
                if (button != null && button.CommandName == "Delete")
                    // Add delete confirmation
                    button.OnClientClick = "if (!confirm('Are you sure " +
                           "you want to delete this record?')) return;";
            }
        }
    }

}

---

嗨 Pedro，我不熟悉使用 asp.net C# 进行编码，所以我很难完成我的项目。我正在使用 Visual Studio 2008...如下所示:

<asp:TemplateField>              
<ItemTemplate>                  
<asp:LinkButton ID="lnkRemove" runat="server"  CommandArgument="<%# Eval("somethingthatidentifiesRow")%>"                      
OnClientClick="return confirm('Do you want to delete?')" Text="Delete"                       
OnClick="DeleteFunction">
</asp:LinkButton>              
</ItemTemplate>         
</asp:TemplateField>     

---

请问我应该在我的 .aspx.cs 文件中放些什么。谢谢

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{ 


}

谢谢 Pedro..我快要拿到它了...但还有 1 个问题..我应该在这里放什么 --> “somethingthatidentifiesRow”？谢谢

<asp:LinkButton ID="lnkRemove" runat="server"  CommandArgument="<%# Eval("somethingthatidentifiesRow")%>" 

Answer 1

再次检查关于元素转换的错误，它说你不能将 tablecell 元素转换为 imagebutton 元素，所以你正在对它进行错误的对话，正确地找到合适的元素，而不是按照我下面解释的那样去做。

您需要检查给定的控件是否为 ImageButton，如果不是，则需要为示例搜索其他控件

foreach (Control control in cell.Controls) 
{ 
  if(control is ImageButton)
  {
   ImageButton button = control as ImageButton; 
    //you code to atttach javascript with button
  }
  else
    continue;
}

或者其他方法是通过单元格中元素的 id 找到控制而不是循环

ImageButton btn = cell.FindControl("id_of_imagebutton") as ImageButton;
if(btn!=null)
{
  //you code to atttach javascript with button

}