显示异常的CommandField删除按钮

Question

我使用的CommandField删除图像按钮，但它不工作。下面是我尝试过的一个片段：

protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
{
        GridViewRow row = (GridViewRow)((Control)e.CommandSource).NamingContainer;
        int indx = row.RowIndex;

        using (Property_dbDataContext context = new Property_dbDataContext())
        {
            if (e.CommandName == "Delete")
            {                
                var delete = (from a in context.Property_basics where a.prop_id == GridView1.Rows[indx].Cells[0].Text select a).Single();

                    delete.delete_status = 1;
                    context.SubmitChanges();
                    GridView1.DeleteRow(indx);                
            }
        }
}

.aspx：

<asp:CommandField ButtonType="Image"  HeaderText="Delete" DeleteImageUrl="~/wp-content/themes/realia/assets/img/500px-Delete_Icon2.png" ShowDeleteButton="True" />

它所显示的例外是：

无法将类型为'System.Web.UI.WebControls.ContentPlaceHolder‘的对象转换为“System.Web.UI.WebControls.GridViewRow”。

Answer 1

试试这个：

GridViewRow row = (GridViewRow)((Control)e.CommandSource).NamingContainer.Parent.Parent;

或者就像

设置命令参数

CommandArgument="<%# ((GridViewRow) Container).RowIndex %>" 


int index = Convert.ToInt32(e.CommandArgument);


GridViewRow row = ProductsGridView.Rows[index];

Answer 2

您应该使用CommandArgument来获取RowIndex，而不是搜索行。在CommandField的情况下，CommandArgument就是RowIndex。对于传递给标准控件的CommandArgument，它是实际的命令参数。

int rowIndex = int.Parse(e.CommandArgument);
GridViewRow row = GridView1.Rows[rowIndex];

Answer 3

您的ASPX将如下所示：

       <asp:Gridview id = Gridview1 runat = "server" DataKeyNames="ID" > 

代码背后:你可以这样做，

 protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
    int ID = Convert.ToInt32(dg1.DataKeys[e.RowIndex].Value.ToString());
    GridViewRow row = (GridViewRow)dg1.Rows[e.RowIndex];
   // write your code. to delete 

}