AJAX中关于多个UpdatePanel 的 UpdateProgress 的使用方法

aspx 代码：

<asp:ScriptManager ID="ScriptManager1" runat="server">
                    </asp:ScriptManager>
                    <asp:UpdatePanel ID="UpdatePanel1" runat="server">
                        <ContentTemplate>
                            <asp:Label ID="Label1" runat="server" Text="页面初始化"></asp:Label>
                            <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button" />
                            <asp:UpdateProgress ID="UpdateProgress1" runat="server" AssociatedUpdatePanelID="UpdatePanel1">
                                <ProgressTemplate>
                                    panel1 正在处理数据
                                </ProgressTemplate>
                            </asp:UpdateProgress>
                        </ContentTemplate>
                    </asp:UpdatePanel>
                    <br />
                      <br />
                    <asp:UpdatePanel ID="UpdatePanel2" runat="server">
                        <ContentTemplate>
                            <asp:Label ID="Label2" runat="server" Text="页面初始化"></asp:Label>
                            <asp:Button ID="Button2" runat="server" OnClick="Button2_Click" Text="Button" />
                            <asp:UpdateProgress ID="UpdateProgress2" runat="server" AssociatedUpdatePanelID="UpdatePanel2">
                                <ProgressTemplate>
                                    panel2 正在处理数据
                                </ProgressTemplate>
                            </asp:UpdateProgress>
                        </ContentTemplate>
                    </asp:UpdatePanel>

aspx.CS 代码：

  protected void Button1_Click(object sender, EventArgs e)
    {
        System.Threading.Thread.Sleep(3000); //为人加的 3 秒延时，为了能让UpdateProgress显示出效果

        Label1.Text = "Page refreshed at " +

            DateTime.Now.ToString();

    }
    protected void Button2_Click(object sender, EventArgs e)
    {
        System.Threading.Thread.Sleep(3000);

        Label2.Text = "Page refreshed at " +

            DateTime.Now.ToString();

    }

关键点：

 <asp:UpdateProgress ID="UpdateProgress2" runat="server" AssociatedUpdatePanelID="UpdatePanel2">

 要为 UpdateProgress  控件指定 AssociatedUpdatePanelID 属性，是要控制哪一个 UpdatePanel 。这样
UpdateProgress   就可以有选择的为某一个UpdatePanel 生效!