Question

出于某种原因，我在更改后不能让Updatepanel中的Gridview刷新。有人可以帮忙吗？

我正在使用ToolkitScriptManager控件和UpdatePanel。

<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
   <ContentTemplate>
        <asp:GridView blah...

         </asp:GridView>

    </ContentTemplate>
   <Triggers>
       <asp:AsyncPostBackTrigger ControlID="DeleteButton" EventName="Click" />
       <asp:AsyncPostBackTrigger ControlID="IBUpUp" EventName="Click" />
       <asp:AsyncPostBackTrigger ControlID="IBDownDown" EventName="Click" />
       <asp:AsyncPostBackTrigger ControlID="IBUp" EventName="Click" />
       <asp:AsyncPostBackTrigger ControlID="IBDown" EventName="Click" />
       <asp:AsyncPostBackTrigger ControlID="EditProfile" EventName="Click" />
   </Triggers>

Cs Page

protected void Unnamed3_Click(object sender, ImageClickEventArgs e)
        {

            int rowIndex = GridView1.SelectedIndex;
            GridViewRow gvr = GridView1.SelectedRow;

            if (rowIndex >= 0)
            {
                //delete

                String GridViewOne = GridView1.DataKeys[rowIndex].Value.ToString();

                //delete image

                string imagename = gvr.Cells[2].Text;

                string pathToImage = @"C:\Images\";

                pathToImage = pathToImage + imagename;


                if (System.IO.File.Exists(pathToImage))
                {
                    // Use a try block to catch IOExceptions, to
                    // handle the case of the file already being
                    // opened by another process.
                    try
                    {
                        System.IO.File.Delete(pathToImage);
                    }
                    catch (System.IO.IOException m)
                    {
                        Console.WriteLine(m.Message);
                        return;
                    }
                }

                int bannerid = Convert.ToInt32(GridViewOne); 

                SqlDataReader sdr = null;

                SqlConnection conn = GetConnection();

                SqlCommand cmd = new SqlCommand("Tool_DeleteBannerAds", conn);

                cmd.CommandType = CommandType.StoredProcedure;

                SqlParameter param1 = new SqlParameter();

                param1.ParameterName = "@BannerID";
                param1.Value = bannerid;

                cmd.Parameters.Add(param1);

                conn.Open();

                sdr = cmd.ExecuteReader();

                sdr.Close();

                UpdatePanel1.Update();
                GridView1.DataBind();

            }
            else
            {
                //don't do anything
                //keep
                //Response.Redirect("Default.aspx");
            }


        }

Answer 1

更改顺序：

 GridView1.DataBind();
 UpdatePanel1.Update();

Answer 2

以下是我的问题代码

ASPX文件

<body>
    <form id="form1" runat="server">
    <asp:ScriptManager ID="ScriptManager1" EnablePageMethods="true" runat="server">
    </asp:ScriptManager>
    <asp:UpdatePanel ID="UpdatePanel1" UpdateMode="Conditional" runat="server">
        <ContentTemplate>
            <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False">
                <Columns>
                    <asp:BoundField HeaderText="Name List" DataField="EmpName" />
                </Columns>
            </asp:GridView>
        </ContentTemplate>
        <Triggers>
            <asp:AsyncPostBackTrigger ControlID="Button1" EventName="Click" />
        </Triggers>
    </asp:UpdatePanel>

    <asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click1" />
    </form>
</body>

文件背后的代码

 protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            var Employee = new { EmpID = 1, EmpName = "Rahul Jain", Department = "IT", Age = 33, Address = "Hello" };
            var customerList = (new[] { Employee }).ToList();
            customerList.Add(new { EmpID = 2, EmpName = "Sheetal Jain", Department = "IT", Age = 33, Address = "Hello" });
            GridView1.DataSource = customerList;
            GridView1.DataBind();
        }
    }
    protected void Button1_Click1(object sender, EventArgs e)
    {
        try
        {
            var Employee = new { EmpID = 1, EmpName = "Rahul Jain", Department = "IT", Age = 33, Address = "Hello" };
            var customerList = (new[] { Employee }).ToList();
            customerList.Add(new { EmpID = 2, EmpName = "Sheetal Jain", Department = "IT", Age = 33, Address = "Hello" });
            customerList.Add(new { EmpID = 2, EmpName = "Minakshi Jain", Department = "IT", Age = 33, Address = "Hello" });
            GridView1.DataSource = customerList;
            GridView1.DataBind();
        }
        catch (Exception ex)
        {
            throw ex;
        }
    }

此代码Dosent为我创建了回发，希望它也适合你......

Answer 3

作为替代方案，您可以将UpdateMode参数设置为“Always”（这是默认值），以允许任何触发回发的Web控件自动更新GridView。

这可以为您节省几行代码（配置触发器），但如果您动态地向GridView添加控件，也会触发页面上的回发事件，这也会有所帮助。

UpdatePanel Gridview未更新

3 个答案: