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报消息。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：在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（不是图像）作为命令按钮。 Line 212: //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，所以我在完成我的项目时遇到了困难。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>     

---

我可以知道我应该在我的 .aspx.cs 文件中添加什么吗？谢谢

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{ 


}

谢谢佩德罗..我几乎在我的路上得到它......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

再次检查有关元素转换的错误，它表示您无法将 tablecell 元素转换为 imagebutton 元素，因此您对其进行了错误的对话，正确地找到了正确的元素，而不是按照我下面的解释进行操作。

您需要检查给定控件是否为 ImageButton，如果不是，则需要为 empl e 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;
}

或其他方法是通过单元格中元素的 id 找到控件，而不是循环

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

}

Answer 2

从 .aspx 可能更容易做到这一点

       <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>

在 .asx.cs 上

您需要以下物品：

public void DeleteFunction(object sender, EventArgs e)
{
    string argumentthatidentifiesRowCell = ((LinkButton)sender).CommandArgument;
    //do your thing to remove
}

Answer 3

试试这样的

protected void GridView_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.
                ImageButton button = control as ImageButton;
                if (button != null && button.CommandName == "Delete") {
                    // Add delete confirmation
                    button.OnClientClick = "if (!confirm('Are You Sure to Delete this Vehicle ?')) return;";
                }
            }
        }
    }
}

在网格视图中是这样的

<asp:GridView ID="GridView1" runat="server" AllowPaging="True" AllowSorting="True" OnRowDataBound="GridView_RowDataBound"
                        AutoGenerateColumns="False" BackColor="White" BorderColor="#CCCCCC" BorderStyle="None"
                        BorderWidth="1px" CellPadding="3" DataKeyNames="DEVICEID" DataSourceID="SqlDataSource1"
                        Font-Names="Arial" Font-Size="Smaller" HorizontalAlign="Center" PageSize="50"
                        Width="100%" EmptyDataText="No Vehicles Found Against the Selected Zone">
                        <RowStyle ForeColor="#000066" />
                        <Columns>
                            <asp:CommandField ShowEditButton=True    
                DeleteImageUrl="~/Images/del.jpg" DeleteText="Delete Record" ButtonType="Image" CancelImageUrl="~/Images/cancel.png" EditImageUrl="~/Images/edit.png" UpdateImageUrl="~/Images/tick.png">
                                <ItemStyle Font-Size="8pt" Width="30px" Wrap="False" />
        </asp:CommandField>