Question

当我单击关机按钮时，它会发送一条消息，我也得到了响应，我可以在DataTable中验证。但是DataGrid没有填充。我检查DataGrid的Rows属性，它有行，但页面没有显示结果。

这是我的代码：

BasicControls.aspx页面

<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
    <Triggers>
        <%-- asp:AsyncPostBackTrigger ControlID="UpdateTimer" EventName="Tick" />--%>
    </Triggers>
    <ContentTemplate>
        <div id="cmdResultsgrdView">
            <asp:GridView ID="grdMessage" runat="server" AutoGenerateColumns="true">
            </asp:GridView>
        </div>
    </ContentTemplate>
</asp:UpdatePanel>
<asp:UpdatePanel ID="UpdatePanel2" runat="server" UpdateMode="Conditional">
    <Triggers>
        <asp:AsyncPostBackTrigger ControlID="ListenerTimer" EventName="Tick" />
    </Triggers>
    <ContentTemplate>

.aspx.cs文件

{
    private static Action<List<IMessage>> callBackCommandResponse = null;
    //ctor
    public BasicControls()
    {
        callBackCommandResponse = CommandResponse;
    }
    //Callback Method
    public void CommandResponse(List<IMessage> Message)
    {
        //Based on MsgType we will filter and display the response.
        if (null != Message)
        {
            //2. Call GetMessage to filter and process message and return DataTable
            resultsDataTable = GetMessages(Message);
            //3. Populate the Grid binding to DataTable
            grdMessage.DataSource = resultsDataTable;
            grdMessage.DataBind();
        }
    }
    //receiver constructor in which we are passing callback to be populated. 
    private ReceivePM receiver = new ReceivePM(callBackCommandResponse);

    //On clicking the code sends Shutdown Command to message queue.
    protected void btnShutdown_Click(object sender, EventArgs e)
    {
        SenderInformation cmdSender = new SenderInformation();
        cmdSender.SendShutdownCommand();
    }
}

Answer 1

尝试调用＆＃34; UpdatePanel1.Update（）＆＃34; DataBind（）事件之后的方法。

grdMessage.DataSource = resultsDataTable;
grdMessage.DataBind();
UpdatePanel1.Update();

Answer 2

谢谢大家。但我想我的应用程序正在与之交互队列。所以，我没有使用ICallBackEventHandler，我实现了自己的回调并将Queue侦听器方法作为一个单独的任务而不是在计时器内启动。如果您有自己的回调，则需要以下代码 if（resultsDataTable.Rows.Count＆gt; 0） { grdMessage.DataSource = resultsDataTable; grdMessage.DataBind（）; System.Text.StringBuilder sb = new System.Text.StringBuilder（）; System.IO.StringWriter sw = new System.IO.StringWriter（）; HtmlTextWriter hw = new HtmlTextWriter（sw）; grdMessage.RenderControl（HW）;

asp：DataGrid不显示Delegate回调数据

2 个答案: