如何让这个DropDownList（filter）再次与这个GridView一起工作？

Question

我正在开发一个用作Suggstions Box的Intranet Web应用程序。管理员将在GridView中看到所有提交的建议列表，并且他有能力通过添加到GridView的DropDownList接受或拒绝这些建议。除此之外，GridView顶部还有一个DropDownList，用于过滤基于提交了其中一个建议的用户的分部的建议。

此外，在此GridView下，还有另一个GridView显示其状态为Accepted或Rejected的建议。每次管理员接受或拒绝其中一个建议后，该GridView将立即刷新。另外，管理员可以打印此GridView。

在UpdatePanel控件中添加第二个GridView之前，一切工作正常，但现在用于过滤第一个GridView中的建议的过滤器不起作用。任何想法？请帮忙吗？

我的ASP.NET代码：

<strong> Division </strong> 
    <asp:DropDownList ID="ddlDivision" runat="server" AppendDataBoundItems="True" 
     AutoPostBack="True" DataSourceID="sqlDataSourceDivision" DataTextField="DivisionShortcut" 
     DataValueField="DivisionShortcut" 
     Width="175px" EnableViewState="False"> 
     <asp:ListItem Value="%">All</asp:ListItem> 
    </asp:DropDownList> 


    <br /> <br /> 

     <asp:GridView ID="GridView1" runat="server" AllowPaging="True" 
         AllowSorting="True" AutoGenerateColumns="False" DataKeyNames="ID" 
         width="950px" CssClass="mGrid" 
         AlternatingRowStyle-CssClass="alt" 
         RowStyle-HorizontalAlign="Center" 
         DataSourceID="SqlDataSource1" 
         OnRowDataBound="GridView1_RowDataBound" > 
      <AlternatingRowStyle BackColor="White" ForeColor="#284775" /> 
      <HeaderStyle Font-Bold = "true" ForeColor="Black" Height="20px"/> 
      <Columns> 
       <asp:BoundField DataField="ID" HeaderText="ID" InsertVisible="False" 
        ReadOnly="True" SortExpression="ID" /> 
       <asp:BoundField DataField="Title" HeaderText="Title" SortExpression="Title" /> 
       <asp:BoundField DataField="Description" HeaderText="Description" 
        SortExpression="Description" /> 
       <asp:BoundField DataField="Name" HeaderText="Name" SortExpression="Name" /> 
       <asp:BoundField DataField="Username" HeaderText="Username" 
        SortExpression="Username" /> 
       <asp:BoundField DataField="DivisionShortcut" HeaderText="Division" 
        SortExpression="DivisionShortcut" /> 
       <asp:TemplateField HeaderText="Status"> 
        <ItemTemplate> 
         <asp:DropDownList ID="DropDownList" runat="server" DataSourceID="SqlDataSource2" 
              Font-Bold="True" ForeColor="#006666" AppendDataBoundItems="false" 
              DataTextField="Status" DataValueField="ID" AutoPostBack="true" 
              OnDataBound="DropDownList_DataBound" OnSelectedIndexChanged ="DropDownList_SelectedIndexChanged"> 
         </asp:DropDownList> 
        </ItemTemplate> 
       </asp:TemplateField> 
      </Columns> 
     </asp:GridView> 
     <asp:SqlDataSource ID="SqlDataSource1" runat="server" 
      ConnectionString="<%$ ConnectionStrings:testConnectionString %>" 
      SelectCommand="SELECT  dbo.SafetySuggestionsLog.ID, dbo.SafetySuggestionsLog.Title, dbo.SafetySuggestionsLog.Description, dbo.employee.Name, dbo.SafetySuggestionsLog.Username, 
         dbo.Divisions.DivisionShortcut 
FROM   dbo.employee INNER JOIN 
         dbo.SafetySuggestionsLog ON dbo.employee.Username = dbo.SafetySuggestionsLog.Username INNER JOIN 
         dbo.Divisions ON dbo.employee.DivisionCode = dbo.Divisions.SapCode" 
         FilterExpression="[DivisionShortcut] like '{0}%'"> 

         <FilterParameters> 
         <asp:ControlParameter ControlID="ddlDivision" Name="DivisionShortcut" 
               PropertyName="SelectedValue" Type="String" /> 
        </FilterParameters> 
     </asp:SqlDataSource> 

     <%--For the DropDownList--%> 
     <asp:SqlDataSource ID="SqlDataSource2" runat="server" 
          ConnectionString="<%$ ConnectionStrings:testConnectionString %>" 
          SelectCommand="SELECT * FROM [SafetySuggestionsStatus]"> 
     </asp:SqlDataSource> 

     <%--Filtering by Division--%> 
     <asp:SqlDataSource ID="sqlDataSourceDivision" runat="server" 
     ConnectionString="<%$ ConnectionStrings:testConnectionString %>" 
     SelectCommand="SELECT [DivisionShortcut] FROM [Divisions]"></asp:SqlDataSource> 

     <asp:UpdatePanel ID="UpdatePanel1" runat="server"> 
    <Triggers> 
     <asp:AsyncPostBackTrigger ControlID="ddlDivision" EventName="SelectedIndexChanged" /> 
    </Triggers> 
    <ContentTemplate> 
      <br /> 

       <p><h3><b><u>PMOD Divisions' Safety Suggestions List</u></b></h3> 
        <p> 
        </p> 
        <br /> 
        <asp:Panel ID="Panel1" runat="server"> 
         <asp:GridView ID="GridView2" runat="server" AllowSorting="True" 
          AlternatingRowStyle-CssClass="alt" AutoGenerateColumns="False" CssClass="mGrid" 
          DataSourceID="SqlDataSource4" RowStyle-HorizontalAlign="Center"> 
          <AlternatingRowStyle BackColor="White" ForeColor="#284775" /> 
          <HeaderStyle Font-Bold="true" ForeColor="Black" Height="20px" /> 
          <Columns> 
           <asp:BoundField DataField="SubmittedMonth" HeaderText="Month Submitted" 
            ReadOnly="True" SortExpression="SubmittedMonth" /> 
           <asp:BoundField DataField="DivisionShortcut" HeaderText="Division" 
            SortExpression="DivisionShortcut" /> 
           <asp:BoundField DataField="Username" HeaderText="NetworkID" 
            SortExpression="Username" /> 
           <asp:BoundField DataField="Name" HeaderText="Name" SortExpression="Name" /> 
           <asp:BoundField DataField="Title" HeaderText="Title" SortExpression="Title" /> 
           <asp:BoundField DataField="Description" HeaderText="Description" 
            SortExpression="Description" /> 
           <asp:BoundField DataField="Type" HeaderText="Type" SortExpression="Type" /> 
           <asp:BoundField DataField="Status" HeaderText="Status" 
            SortExpression="Status" /> 
          </Columns> 
          <RowStyle HorizontalAlign="Center" /> 
         </asp:GridView> 
        </asp:Panel> 
        <asp:SqlDataSource ID="SqlDataSource4" runat="server" 
         ConnectionString="<%$ ConnectionStrings:testConnectionString %>" SelectCommand="SELECT  TOP (100) PERCENT LEFT(DATENAME(month, dbo.SafetySuggestionsLog.DateSubmitted), 3) + '-' + DATENAME(year, dbo.SafetySuggestionsLog.DateSubmitted) 
         AS SubmittedMonth, dbo.Divisions.DivisionShortcut, dbo.SafetySuggestionsLog.Username, dbo.employee.Name, dbo.SafetySuggestionsLog.Title, 
         dbo.SafetySuggestionsLog.Description, dbo.SafetySuggestionsType.Type, dbo.SafetySuggestionsStatus.Status 
FROM   dbo.Divisions INNER JOIN 
         dbo.employee ON dbo.Divisions.SapCode = dbo.employee.DivisionCode INNER JOIN 
         dbo.SafetySuggestionsLog ON dbo.employee.Username = dbo.SafetySuggestionsLog.Username INNER JOIN 
         dbo.SafetySuggestionsType ON dbo.SafetySuggestionsLog.TypeID = dbo.SafetySuggestionsType.ID INNER JOIN 
         dbo.SafetySuggestionsStatus ON dbo.SafetySuggestionsLog.StatusID = dbo.SafetySuggestionsStatus.ID 
WHERE  (DATEDIFF(month, dbo.SafetySuggestionsLog.DateSubmitted, GETDATE()) &lt; 3) 
ORDER BY dbo.SafetySuggestionsLog.DateSubmitted DESC"></asp:SqlDataSource> 
        <asp:Button ID="btnPrint" runat="server" OnClick="btnPrint_Click" 
         Text="Print" /> 
        <p> 
        </p> 
      </p>  


     </ContentTemplate> 
    </asp:UpdatePanel> 

代码隐藏：

protected void btnPrint_Click(object sender, EventArgs e) 
    { 
     Session["ctrl"] = Panel1; 
     ScriptManager.RegisterStartupScript(GridView2, GridView2.GetType(), "onclick", "window.open('Print.aspx','PrintMe','height=400px,width=800px,scrollbars=1');", true); 
    } 

    int i = 1; 
    protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e) 
    { 
     if (e.Row.RowType == DataControlRowType.DataRow) 
     { 
      e.Row.Cells[0].Text = i.ToString(); 
      i++; 

     } 
    } 


    protected void DropDownList_DataBound(object sender, EventArgs e) 
    { 
     if (!IsPostBack) 
     { 
      ((DropDownList)sender).Items.Insert(0, new ListItem("--Select--", "")); 
     } 
    } 

    protected void DropDownList_SelectedIndexChanged(object sender, EventArgs e) 
    { 
     DropDownList ddl = (DropDownList)sender; 
     int suggestionStatus = int.Parse(ddl.SelectedValue); 
     GridViewRow row = (GridViewRow)ddl.NamingContainer; 
     string strID = GridView1.DataKeys[row.RowIndex]["ID"].ToString(); 
     int ID = Int32.Parse(strID); 
     //For inserting the status in the database 
     string connString = "Data Source=localhost\\sqlexpress;Initial Catalog=psspdbTest;Integrated Security=True"; 
     string updateCommand = "UPDATE SafetySuggestionsLog SET [StatusID] = @StatusID WHERE [ID] = @ID"; 
     using (SqlConnection conn = new SqlConnection(connString)) 
     { 
      conn.Open(); 
      using (SqlCommand cmd = new SqlCommand(updateCommand, conn)) 
      { 
       cmd.Parameters.Clear(); 
       cmd.Parameters.AddWithValue("@StatusID", suggestionStatus); 
       cmd.Parameters.AddWithValue("@ID", ID); 
       cmd.ExecuteNonQuery(); 
      } 
      conn.Close(); 
     } 

     GridView2.DataBind(); 

    } 

Answer 1

1. 您可以指定什么是第一格的ID？

2. 我可以设想的是，也许你没有手动在你的selectedIndex更改事件更新的UpdatePanel

   using (SqlConnection conn = new SqlConnection(connString)) 
   { 
        using (SqlCommand cmd = new SqlCommand(updateCommand, conn)) 
        { 
         cmd.Parameters.Clear(); 
         cmd.Parameters.AddWithValue("@StatusID", suggestionStatus); 
         cmd.Parameters.AddWithValue("@ID", ID); 
         conn.Open(); 
         cmd.ExecuteNonQuery(); 
        } 
       conn.Close(); 
   } 
       GridView2.DataBind(); 
       UpdatePanel1.Update(); 
   

而且在你的aspx设置的UpdateMode = “条件”

<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">