如何从过滤的 GridView 使 DropDownList 动态化答案

【问题标题】：How to make DropDownList dynamic from filtered GridView如何从过滤的 GridView 使 DropDownList 动态化
【发布时间】：2014-10-15 16:11:57
【问题描述】：

这是我的 Asp.net 代码：

<asp:UpdatePanel runat="server" ClientIDMode="Static" ID="TasksUpdatePanel" UpdateMode="Conditional">
    <ContentTemplate>
        <table class="taskGridView">
            <tr>
                <td>
                    <asp:DropDownList ID="ddlTaskName" CssClass="chosen-select" DataSourceID="dsPopulateTaskName" AutoPostBack="true" DataValueField="Task Name" runat="server" Width="100%" Font-Size="11px" AppendDataBoundItems="true" OnSelectedIndexChanged="ddlTaskName_onSelectIndexChanged">
                        <asp:ListItem Text="All" Value="%"></asp:ListItem>
                    </asp:DropDownList>
                    <asp:SqlDataSource ID="dsPopulateTaskName" runat="server" ConnectionString="<%$ ConnectionStrings:gvConnString %>" SelectCommand="SELECT DISTINCT [ATTR2739] 'Task Name' FROM HSI.RMOBJECTINSTANCE1224 CT INNER JOIN HSI.RMOBJECTINSTANCE1232 S ON CT.ATTR2846 = S.ATTR2821 INNER JOIN HSI.USERACCOUNT UA ON S.FK2852 = (UA.USERNUM * -1) LEFT JOIN HSI.RMOBJECTINSTANCE1251 PXC ON PXC.FK2924 = CT.OBJECTID LEFT JOIN HSI.RMOBJECTINSTANCE1249 P ON PXC.FK2923 = P.OBJECTID LEFT JOIN HSI.RMOBJECTINSTANCE1248 PRXC ON PRXC.FK2912 = CT.OBJECTID LEFT JOIN HSI.RMOBJECTINSTANCE1230 PR ON PR.OBJECTID = PRXC.FK2911 LEFT JOIN HSI.RMOBJECTINSTANCE1247 SXC ON SXC.FK2908 = CT.OBJECTID LEFT JOIN HSI.RMOBJECTINSTANCE1229 SI ON SI.OBJECTID = SXC.FK2907 INNER JOIN HSI.RMOBJECTINSTANCE1231 C ON CT.FK2927 = C.OBJECTID WHERE CT.ACTIVESTATUS = 0"></asp:SqlDataSource>
                </td>
                <td>
                    <asp:DropDownList ID="ddlService" CssClass="chosen-select" DataSourceID="dsPopulateService" AutoPostBack="true" DataValueField="Service" runat="server" Width="100%" Font-Size="11px" AppendDataBoundItems="true" OnSelectedIndexChanged="ddlService_onSelectIndexChanged">
                        <asp:ListItem Text="All" Value="%"></asp:ListItem>
                    </asp:DropDownList>
                    <asp:SqlDataSource ID="dsPopulateService" runat="server" ConnectionString="<%$ ConnectionStrings:gvConnString %>" SelectCommand="SELECT DISTINCT [ATTR2846] 'Service' FROM HSI.RMOBJECTINSTANCE1224 CT INNER JOIN HSI.RMOBJECTINSTANCE1232 S ON CT.ATTR2846 = S.ATTR2821 INNER JOIN HSI.USERACCOUNT UA ON S.FK2852 = (UA.USERNUM * -1) LEFT JOIN HSI.RMOBJECTINSTANCE1251 PXC ON PXC.FK2924 = CT.OBJECTID LEFT JOIN HSI.RMOBJECTINSTANCE1249 P ON PXC.FK2923 = P.OBJECTID LEFT JOIN HSI.RMOBJECTINSTANCE1248 PRXC ON PRXC.FK2912 = CT.OBJECTID LEFT JOIN HSI.RMOBJECTINSTANCE1230 PR ON PR.OBJECTID = PRXC.FK2911 LEFT JOIN HSI.RMOBJECTINSTANCE1247 SXC ON SXC.FK2908 = CT.OBJECTID LEFT JOIN HSI.RMOBJECTINSTANCE1229 SI ON SI.OBJECTID = SXC.FK2907 INNER JOIN HSI.RMOBJECTINSTANCE1231 C ON CT.FK2927 = C.OBJECTID WHERE CT.ACTIVESTATUS = 0"></asp:SqlDataSource>
                </td>
                <td>
                    <asp:DropDownList ID="ddlStatus" CssClass="chosen-select" DataSourceID="dsPopulateStatus" AutoPostBack="true" DataValueField="Status" runat="server" Width="100%" Font-Size="11px" AppendDataBoundItems="true" OnSelectedIndexChanged="ddlStatus_onSelectIndexChanged">
                        <asp:ListItem Text="All" Value="%"></asp:ListItem>
                    </asp:DropDownList>
                    <asp:SqlDataSource ID="dsPopulateStatus" runat="server" ConnectionString="<%$ ConnectionStrings:gvConnString %>" SelectCommand="SELECT DISTINCT [ATTR2812] 'Status' FROM HSI.RMOBJECTINSTANCE1224 CT INNER JOIN HSI.RMOBJECTINSTANCE1232 S ON CT.ATTR2846 = S.ATTR2821 INNER JOIN HSI.USERACCOUNT UA ON S.FK2852 = (UA.USERNUM * -1) LEFT JOIN HSI.RMOBJECTINSTANCE1251 PXC ON PXC.FK2924 = CT.OBJECTID LEFT JOIN HSI.RMOBJECTINSTANCE1249 P ON PXC.FK2923 = P.OBJECTID LEFT JOIN HSI.RMOBJECTINSTANCE1248 PRXC ON PRXC.FK2912 = CT.OBJECTID LEFT JOIN HSI.RMOBJECTINSTANCE1230 PR ON PR.OBJECTID = PRXC.FK2911 LEFT JOIN HSI.RMOBJECTINSTANCE1247 SXC ON SXC.FK2908 = CT.OBJECTID LEFT JOIN HSI.RMOBJECTINSTANCE1229 SI ON SI.OBJECTID = SXC.FK2907 INNER JOIN HSI.RMOBJECTINSTANCE1231 C ON CT.FK2927 = C.OBJECTID WHERE CT.ACTIVESTATUS = 0"></asp:SqlDataSource>
                </td>
                <td>
                    <asp:DropDownList ID="ddlDueDate" CssClass="chosen-select" DataSourceID="dsPopulateDueDate" AutoPostBack="true" DataValueField="Due Date" runat="server" Width="100%" Font-Size="11px" AppendDataBoundItems="true" OnSelectedIndexChanged="ddlDueDate_onSelectIndexChanged">
                        <asp:ListItem Text="All" Value="%"></asp:ListItem>
                    </asp:DropDownList>
                    <asp:SqlDataSource ID="dsPopulateDueDate" runat="server" ConnectionString="<%$ ConnectionStrings:gvConnString %>" SelectCommand="SELECT DISTINCT CONVERT(VARCHAR(14), [ATTR2752], 110) 'Due Date' FROM HSI.RMOBJECTINSTANCE1224 CT INNER JOIN HSI.RMOBJECTINSTANCE1232 S ON CT.ATTR2846 = S.ATTR2821 INNER JOIN HSI.USERACCOUNT UA ON S.FK2852 = (UA.USERNUM * -1) LEFT JOIN HSI.RMOBJECTINSTANCE1251 PXC ON PXC.FK2924 = CT.OBJECTID LEFT JOIN HSI.RMOBJECTINSTANCE1249 P ON PXC.FK2923 = P.OBJECTID LEFT JOIN HSI.RMOBJECTINSTANCE1248 PRXC ON PRXC.FK2912 = CT.OBJECTID LEFT JOIN HSI.RMOBJECTINSTANCE1230 PR ON PR.OBJECTID = PRXC.FK2911 LEFT JOIN HSI.RMOBJECTINSTANCE1247 SXC ON SXC.FK2908 = CT.OBJECTID LEFT JOIN HSI.RMOBJECTINSTANCE1229 SI ON SI.OBJECTID = SXC.FK2907 INNER JOIN HSI.RMOBJECTINSTANCE1231 C ON CT.FK2927 = C.OBJECTID WHERE CT.ACTIVESTATUS = 0"></asp:SqlDataSource>
                </td>
                <td>
                    <asp:DropDownList ID="ddlOwner" CssClass="chosen-select" DataSourceID="dsPopulateOwner" AutoPostBack="true" DataValueField="Owner" runat="server" Width="100%" Font-Size="11px" AppendDataBoundItems="true" OnSelectedIndexChanged="ddlOwner_onSelectIndexChanged">
                        <asp:ListItem Text="All" Value="%"></asp:ListItem>
                    </asp:DropDownList>
                    <asp:SqlDataSource ID="dsPopulateOwner" runat="server" ConnectionString="<%$ ConnectionStrings:gvConnString %>" SelectCommand="SELECT DISTINCT [REALNAME] 'Owner' FROM HSI.RMOBJECTINSTANCE1224 CT INNER JOIN HSI.RMOBJECTINSTANCE1232 S ON CT.ATTR2846 = S.ATTR2821 INNER JOIN HSI.USERACCOUNT UA ON S.FK2852 = (UA.USERNUM * -1) LEFT JOIN HSI.RMOBJECTINSTANCE1251 PXC ON PXC.FK2924 = CT.OBJECTID LEFT JOIN HSI.RMOBJECTINSTANCE1249 P ON PXC.FK2923 = P.OBJECTID LEFT JOIN HSI.RMOBJECTINSTANCE1248 PRXC ON PRXC.FK2912 = CT.OBJECTID LEFT JOIN HSI.RMOBJECTINSTANCE1230 PR ON PR.OBJECTID = PRXC.FK2911 LEFT JOIN HSI.RMOBJECTINSTANCE1247 SXC ON SXC.FK2908 = CT.OBJECTID LEFT JOIN HSI.RMOBJECTINSTANCE1229 SI ON SI.OBJECTID = SXC.FK2907 INNER JOIN HSI.RMOBJECTINSTANCE1231 C ON CT.FK2927 = C.OBJECTID WHERE CT.ACTIVESTATUS = 0"></asp:SqlDataSource>
                </td>
                <td>
                    <asp:DropDownList ID="ddlClient" CssClass="chosen-select" DataSourceID="dsPopulateClient" AutoPostBack="true" DataValueField="Client" runat="server" Width="100%" Font-Size="11px" AppendDataBoundItems="true" OnSelectedIndexChanged="ddlClient_onSelectIndexChanged">
                        <asp:ListItem Text="All" Value="%"></asp:ListItem>
                    </asp:DropDownList>
                    <asp:SqlDataSource ID="dsPopulateClient" runat="server" ConnectionString="<%$ ConnectionStrings:gvConnString %>" SelectCommand="SELECT DISTINCT [ATTR2815] 'Client' FROM HSI.RMOBJECTINSTANCE1224 CT INNER JOIN HSI.RMOBJECTINSTANCE1232 S ON CT.ATTR2846 = S.ATTR2821 INNER JOIN HSI.USERACCOUNT UA ON S.FK2852 = (UA.USERNUM * -1) LEFT JOIN HSI.RMOBJECTINSTANCE1251 PXC ON PXC.FK2924 = CT.OBJECTID LEFT JOIN HSI.RMOBJECTINSTANCE1249 P ON PXC.FK2923 = P.OBJECTID LEFT JOIN HSI.RMOBJECTINSTANCE1248 PRXC ON PRXC.FK2912 = CT.OBJECTID LEFT JOIN HSI.RMOBJECTINSTANCE1230 PR ON PR.OBJECTID = PRXC.FK2911 LEFT JOIN HSI.RMOBJECTINSTANCE1247 SXC ON SXC.FK2908 = CT.OBJECTID LEFT JOIN HSI.RMOBJECTINSTANCE1229 SI ON SI.OBJECTID = SXC.FK2907 INNER JOIN HSI.RMOBJECTINSTANCE1231 C ON CT.FK2927 = C.OBJECTID WHERE CT.ACTIVESTATUS = 0"></asp:SqlDataSource>
                </td>
                <td>
                    <asp:DropDownList ID="ddlSite" CssClass="chosen-select" DataSourceID="dsPopulateSite" AutoPostBack="true" DataValueField="Site" runat="server" Width="100%" Font-Size="11px" AppendDataBoundItems="true" OnSelectedIndexChanged="ddlSite_onSelectIndexChanged">
                        <asp:ListItem Text="All" Value="%"></asp:ListItem>
                    </asp:DropDownList>
                    <asp:SqlDataSource ID="dsPopulateSite" runat="server" ConnectionString="<%$ ConnectionStrings:gvConnString %>" SelectCommand="SELECT DISTINCT [ATTR2819] 'Site' FROM HSI.RMOBJECTINSTANCE1224 CT INNER JOIN HSI.RMOBJECTINSTANCE1232 S ON CT.ATTR2846 = S.ATTR2821 INNER JOIN HSI.USERACCOUNT UA ON S.FK2852 = (UA.USERNUM * -1) LEFT JOIN HSI.RMOBJECTINSTANCE1251 PXC ON PXC.FK2924 = CT.OBJECTID LEFT JOIN HSI.RMOBJECTINSTANCE1249 P ON PXC.FK2923 = P.OBJECTID LEFT JOIN HSI.RMOBJECTINSTANCE1248 PRXC ON PRXC.FK2912 = CT.OBJECTID LEFT JOIN HSI.RMOBJECTINSTANCE1230 PR ON PR.OBJECTID = PRXC.FK2911 LEFT JOIN HSI.RMOBJECTINSTANCE1247 SXC ON SXC.FK2908 = CT.OBJECTID LEFT JOIN HSI.RMOBJECTINSTANCE1229 SI ON SI.OBJECTID = SXC.FK2907 INNER JOIN HSI.RMOBJECTINSTANCE1231 C ON CT.FK2927 = C.OBJECTID WHERE CT.ACTIVESTATUS = 0"></asp:SqlDataSource>
                </td>
                <td>
                    <asp:DropDownList ID="ddlPractice" CssClass="chosen-select" DataSourceID="dsPopulatePractice" AutoPostBack="true" DataValueField="Practice" runat="server" Width="100%" Font-Size="11px" AppendDataBoundItems="true" OnSelectedIndexChanged="ddlPractice_onSelectIndexChanged">
                        <asp:ListItem Text="All" Value="%"></asp:ListItem>
                    </asp:DropDownList>
                    <asp:SqlDataSource ID="dsPopulatePractice" runat="server" ConnectionString="<%$ ConnectionStrings:gvConnString %>" SelectCommand="SELECT DISTINCT [ATTR2817] 'Practice' FROM HSI.RMOBJECTINSTANCE1224 CT INNER JOIN HSI.RMOBJECTINSTANCE1232 S ON CT.ATTR2846 = S.ATTR2821 INNER JOIN HSI.USERACCOUNT UA ON S.FK2852 = (UA.USERNUM * -1) LEFT JOIN HSI.RMOBJECTINSTANCE1251 PXC ON PXC.FK2924 = CT.OBJECTID LEFT JOIN HSI.RMOBJECTINSTANCE1249 P ON PXC.FK2923 = P.OBJECTID LEFT JOIN HSI.RMOBJECTINSTANCE1248 PRXC ON PRXC.FK2912 = CT.OBJECTID LEFT JOIN HSI.RMOBJECTINSTANCE1230 PR ON PR.OBJECTID = PRXC.FK2911 LEFT JOIN HSI.RMOBJECTINSTANCE1247 SXC ON SXC.FK2908 = CT.OBJECTID LEFT JOIN HSI.RMOBJECTINSTANCE1229 SI ON SI.OBJECTID = SXC.FK2907 INNER JOIN HSI.RMOBJECTINSTANCE1231 C ON CT.FK2927 = C.OBJECTID WHERE CT.ACTIVESTATUS = 0"></asp:SqlDataSource>
                </td>
                <td>
                    <asp:DropDownList ID="ddlProvider" CssClass="chosen-select" DataSourceID="dsPopulateProvider" AutoPostBack="true" DataValueField="Provider" runat="server" Width="100%" Font-Size="11px" AppendDataBoundItems="true" OnSelectedIndexChanged="ddlProvider_onSelectIndexChanged">
                        <asp:ListItem Text="All" Value="%"></asp:ListItem>
                    </asp:DropDownList>
                    <asp:SqlDataSource ID="dsPopulateProvider" runat="server" ConnectionString="<%$ ConnectionStrings:gvConnString %>" SelectCommand="SELECT DISTINCT [ATTR2919] 'Provider' FROM HSI.RMOBJECTINSTANCE1224 CT INNER JOIN HSI.RMOBJECTINSTANCE1232 S ON CT.ATTR2846 = S.ATTR2821 INNER JOIN HSI.USERACCOUNT UA ON S.FK2852 = (UA.USERNUM * -1) LEFT JOIN HSI.RMOBJECTINSTANCE1251 PXC ON PXC.FK2924 = CT.OBJECTID LEFT JOIN HSI.RMOBJECTINSTANCE1249 P ON PXC.FK2923 = P.OBJECTID LEFT JOIN HSI.RMOBJECTINSTANCE1248 PRXC ON PRXC.FK2912 = CT.OBJECTID LEFT JOIN HSI.RMOBJECTINSTANCE1230 PR ON PR.OBJECTID = PRXC.FK2911 LEFT JOIN HSI.RMOBJECTINSTANCE1247 SXC ON SXC.FK2908 = CT.OBJECTID LEFT JOIN HSI.RMOBJECTINSTANCE1229 SI ON SI.OBJECTID = SXC.FK2907 INNER JOIN HSI.RMOBJECTINSTANCE1231 C ON CT.FK2927 = C.OBJECTID WHERE CT.ACTIVESTATUS = 0"></asp:SqlDataSource>
                </td>
            </tr>
        </table>
        <asp:GridView ShowHeaderWhenEmpty="false" AlternatingRowStyle-BackColor="#EBE9E9" AutoGenerateColumns="false" OnSorting="yourTasksGV_Sorting" AllowSorting="true" ID="yourTasksGV" runat="server" ClientIDMode="Static" EmptyDataText="There is no data to display" OnRowDataBound="yourTasksGV_RowDataBound" OnRowCreated="yourTasksGV_RowCreated">
            <Columns>
                <asp:HyperLinkField Target="_blank" DataNavigateUrlFields="Task Detail" DataTextField="Task Name" DataNavigateUrlFormatString="" HeaderText="Task Detail" SortExpression="Task Name" ItemStyle-CssClass="taskTableColumn" />
                <asp:BoundField DataField="Service" HeaderText="Service" SortExpression="Service" ItemStyle-CssClass="taskTableColumn" />
                <asp:BoundField DataField="Status" HeaderText="Status" SortExpression="Status" ItemStyle-CssClass="taskTableColumn" />
                <asp:BoundField DataField="Due Date" HeaderText="Due" SortExpression="Due Date" ItemStyle-CssClass="taskTableColumn" />
                <asp:BoundField DataField="Owner" HeaderText="Owner" SortExpression="Owner" ItemStyle-CssClass="taskTableColumn" />
                <asp:BoundField DataField="Client" HeaderText="Client" SortExpression="Client" ItemStyle-CssClass="taskTableColumn" />
                <asp:BoundField DataField="Site" HeaderText="Site" SortExpression="Site" ItemStyle-CssClass="taskTableColumn" />
                <asp:BoundField DataField="Practice" HeaderText="Practice" SortExpression="Practice" ItemStyle-CssClass="taskTableColumn" />
                <asp:BoundField DataField="Provider" HeaderText="Provider" SortExpression="Provider" ItemStyle-CssClass="taskTableColumn" />
            </Columns>
        </asp:GridView>
    </ContentTemplate>
</asp:UpdatePanel>

我的代码隐藏：

protected void Page_Load(object sender, EventArgs e)
{

    strMainQuery = @"SELECT
               CT.OBJECTID,
               'http://checkthis.com/d=' + CAST(CT.OBJECTID AS VARCHAR) + '&classid=1224' 'Task Detail'
               ,LTRIM(RTRIM(CT.ATTR2846)) 'Service'
               ,LTRIM(RTRIM(CT.ATTR2812)) 'Status'
               ,CONVERT(VARCHAR(14), CT.ATTR2752, 110) 'Due Date'
               ,LTRIM(RTRIM(CT.ATTR2739)) 'Task Name'
               ,LTRIM(RTRIM(UA.REALNAME)) 'Owner'
               ,LTRIM(RTRIM(C.ATTR2815)) 'Client'
               ,RTRIM(SI.ATTR2819) 'Site'
               ,RTRIM(PR.ATTR2817) 'Practice'
               ,RTRIM(P.ATTR2919) 'Provider'
        FROM HSI.RMOBJECTINSTANCE1224 CT 
               INNER JOIN HSI.RMOBJECTINSTANCE1232 S ON CT.ATTR2846 = S.ATTR2821 
               INNER JOIN HSI.USERACCOUNT UA ON S.FK2852 = (UA.USERNUM * -1)
               LEFT JOIN HSI.RMOBJECTINSTANCE1251 PXC ON PXC.FK2924 = CT.OBJECTID
               LEFT JOIN HSI.RMOBJECTINSTANCE1249 P ON PXC.FK2923 = P.OBJECTID
               LEFT JOIN HSI.RMOBJECTINSTANCE1248 PRXC ON PRXC.FK2912 = CT.OBJECTID
               LEFT JOIN HSI.RMOBJECTINSTANCE1230 PR ON PR.OBJECTID = PRXC.FK2911
               LEFT JOIN HSI.RMOBJECTINSTANCE1247 SXC ON SXC.FK2908 = CT.OBJECTID
               LEFT JOIN HSI.RMOBJECTINSTANCE1229 SI ON SI.OBJECTID = SXC.FK2907
                INNER JOIN HSI.RMOBJECTINSTANCE1231 C ON CT.FK2927 = C.OBJECTID";

    if (!Page.IsPostBack)
    {
        ViewState["sortOrder"] = "Asc";
        ViewState["sortExp"] = "Due Date";
        PullData("Due Date", "Asc"); //ASC: A (top) to Z (bottom) || # (low to high) || Date (oldest to newest)
    }
}
public void PullData(string sortExp, string sortDir)
{
    query = "";
    DataTable taskData = new DataTable();
    connString = @""; //connectionstring
    if (ddlTaskName.SelectedIndex > 0)
    {
        strClause += " AND CT.ATTR2739 = '" + ddlTaskName.SelectedItem.Text + "'";
    }
    else
    {
        strClause += " AND CT.ATTR2739 LIKE '%'";
    }
    if (ddlService.SelectedIndex > 0)
    {
        strClause += " AND CT.ATTR2846 = '" + ddlService.SelectedItem.Text + "'";
    }
    else
    {
        strClause += " AND CT.ATTR2846 LIKE '%'";
    }
    if (ddlStatus.SelectedIndex > 0)
    {
        strClause += " AND CT.ATTR2812 = '" + ddlStatus.SelectedItem.Text + "'";
    }
    else
    {
        strClause += " AND CT.ATTR2812 LIKE '%'";
    }
    if (ddlDueDate.SelectedIndex > 0)
    {
        strClause += " AND CONVERT(VARCHAR(14), CT.ATTR2752, 110) = '" + ddlDueDate.SelectedItem.Text + "'";
    }
    else
    {
        strClause += " AND CONVERT(VARCHAR(14), CT.ATTR2752, 110) LIKE '%'";
    }
    if (ddlOwner.SelectedIndex > 0)
    {
        strClause += " AND UA.REALNAME = '" + ddlOwner.SelectedItem.Text + "'";
    }
    else
    {
        strClause += " AND UA.REALNAME LIKE '%'";
    }
    if (ddlClient.SelectedIndex > 0)
    {
        strClause += " AND C.ATTR2815 = '" + ddlClient.SelectedItem.Text + "'";
    }
    else
    {
        strClause += " AND C.ATTR2815 LIKE '%'";
    }
    if (ddlSite.SelectedIndex > 0)
    {
        strClause += " AND SI.ATTR2819 = '" + ddlSite.SelectedItem.Text + "'";
    }
    else
    {
        strClause += " AND SI.ATTR2819 LIKE '%'";
    }
    if (ddlPractice.SelectedIndex > 0)
    {
        strClause += " AND PR.ATTR2817 = '" + ddlPractice.SelectedItem.Text + "'";
    }
    else
    {
        strClause += " AND PR.ATTR2817 LIKE '%'";
    }
    if (ddlProvider.SelectedIndex > 0)
    {
        strClause += " AND P.ATTR2919 = '" + ddlProvider.SelectedItem.Text + "'";
    }
    else
    {
        strClause += " AND P.ATTR2919 LIKE '%'";
    }


    if (ddlTaskName.SelectedIndex == 0 && ddlService.SelectedIndex == 0 && ddlStatus.SelectedIndex == 0 && ddlDueDate.SelectedIndex == 0 && ddlOwner.SelectedIndex == 0 && ddlClient.SelectedIndex == 0 && ddlSite.SelectedIndex == 0 && ddlPractice.SelectedIndex == 0 && ddlProvider.SelectedIndex == 0)
    {
        query = strMainQuery + " WHERE CT.ACTIVESTATUS = 0";
    }
    else
    {
        query = strMainQuery + " WHERE CT.ACTIVESTATUS = 0" + strClause;
    }

    using (SqlConnection conn = new SqlConnection(connString))
    {
        try
        {
            SqlCommand cmd = new SqlCommand(query, conn);

            // create data adapter
            SqlDataAdapter da = new SqlDataAdapter(query, conn);
            // this will query your database and return the result to your datatable

            DataSet myDataSet = new DataSet();
            da.Fill(myDataSet);

            myDataView = new DataView();
            myDataView = myDataSet.Tables[0].DefaultView;

            if (sortExp != string.Empty)
            {
                //MessageBox.Show(sortExp);
                //MessageBox.Show(sortDir);
                myDataView.Sort = string.Format("{0} {1}", sortExp, sortDir);
            }

            yourTasksGV.DataSource = myDataView;
            yourTasksGV.DataBind();

            TasksUpdatePanel.Update();

            conn.Close();
        }
        catch (Exception ex)
        {
            string error = ex.Message;
        }
    }
}
protected void ddlTaskName_onSelectIndexChanged(object sender, EventArgs e)
{
    PullData(ViewState["sortExp"].ToString(), ViewState["sortOrder"].ToString());
}
protected void ddlOwner_onSelectIndexChanged(object sender, EventArgs e)
{
    PullData(ViewState["sortExp"].ToString(), ViewState["sortOrder"].ToString());
}
protected void ddlService_onSelectIndexChanged(object sender, EventArgs e)
{
    PullData(ViewState["sortExp"].ToString(), ViewState["sortOrder"].ToString());
}
protected void ddlStatus_onSelectIndexChanged(object sender, EventArgs e)
{
    PullData(ViewState["sortExp"].ToString(), ViewState["sortOrder"].ToString());
}
protected void ddlDueDate_onSelectIndexChanged(object sender, EventArgs e)
{
    PullData(ViewState["sortExp"].ToString(), ViewState["sortOrder"].ToString());
}
protected void ddlClient_onSelectIndexChanged(object sender, EventArgs e)
{
    PullData(ViewState["sortExp"].ToString(), ViewState["sortOrder"].ToString());
}
protected void ddlSite_onSelectIndexChanged(object sender, EventArgs e)
{
    PullData(ViewState["sortExp"].ToString(), ViewState["sortOrder"].ToString());
}
protected void ddlPractice_onSelectIndexChanged(object sender, EventArgs e)
{
    PullData(ViewState["sortExp"].ToString(), ViewState["sortOrder"].ToString());
}
protected void ddlProvider_onSelectIndexChanged(object sender, EventArgs e)
{
    PullData(ViewState["sortExp"].ToString(), ViewState["sortOrder"].ToString());
}

public string sortOrder
{
    get
    {
        if (ViewState["sortOrder"].ToString() == "Desc")
        {
            ViewState["sortOrder"] = "Asc";
        }
        else
        {
            ViewState["sortOrder"] = "Desc";
        }

        return ViewState["sortOrder"].ToString();
    }
    set
    {
        ViewState["sortOrder"] = value;
    }
}

如何从过滤后的 GridView 中实现 Dynamic DropDownList？

提前致谢。

【问题讨论】：

如何应用过滤器？
在每次我选择新选择时调用的PullData 函数中。一切都对我有用，除了 DropDownList 不会根据过滤的内容进行更新，而且 DropDownlist 应该有 ALL 无论如何，只有为列选择的选项

标签： c# asp.net sorting gridview

【解决方案1】：

你可以尝试的一件事

在除 where 子句之外的私有 var 中处理所有下拉查询
您可以创建一个方法来为所有人构建 where 子句（下拉列表和网格视图）
当数据绑定网格视图时，也会重新绑定下拉列表。

注意：由于您正在使用附加数据绑定项，因此您需要清除当前选项。一个替代方案是这样的

select 'All' as [Task Name], '%' as value
union
SELECT DISTINCT [ATTR2739] as 'Task Name', [ATTR2739] as 'Value' FROM .....

如果你设置你的私人选择变量像

var _selectForADropDown = "select distinct ...... {0}"

然后您将过滤器应用于gridview，您也可以将过滤器应用于下拉列表的数据源

dataSourceForDropDown.SelectStatement = string.Format(selectForADropDown, MethodForTheWareClasues());
dropDownList.DataBind();

一件事可能会有所帮助

为查询的每个部分使用私有 const var，以便您可以重复使用它

分解查询，这样 where 和 from 子句可以同时用于 gridview 和下拉菜单

private const string StrMainQuery = @"SELECT
               CT.OBJECTID,
               'http://checkthis.com/d=' + CAST(CT.OBJECTID AS VARCHAR) + '&classid=1224' 'Task Detail'
               ,LTRIM(RTRIM(CT.ATTR2846)) 'Service'
               ,LTRIM(RTRIM(CT.ATTR2812)) 'Status'
               ,CONVERT(VARCHAR(14), CT.ATTR2752, 110) 'Due Date'
               ,LTRIM(RTRIM(CT.ATTR2739)) 'Task Name'
               ,LTRIM(RTRIM(UA.REALNAME)) 'Owner'
               ,LTRIM(RTRIM(C.ATTR2815)) 'Client'
               ,RTRIM(SI.ATTR2819) 'Site'
               ,RTRIM(PR.ATTR2817) 'Practice'
               ,RTRIM(P.ATTR2919) 'Provider'";
        private const string _from = @"
        FROM HSI.RMOBJECTINSTANCE1224 CT 
               INNER JOIN HSI.RMOBJECTINSTANCE1232 S ON CT.ATTR2846 = S.ATTR2821 
               INNER JOIN HSI.USERACCOUNT UA ON S.FK2852 = (UA.USERNUM * -1)
               LEFT JOIN HSI.RMOBJECTINSTANCE1251 PXC ON PXC.FK2924 = CT.OBJECTID
               LEFT JOIN HSI.RMOBJECTINSTANCE1249 P ON PXC.FK2923 = P.OBJECTID
               LEFT JOIN HSI.RMOBJECTINSTANCE1248 PRXC ON PRXC.FK2912 = CT.OBJECTID
               LEFT JOIN HSI.RMOBJECTINSTANCE1230 PR ON PR.OBJECTID = PRXC.FK2911
               LEFT JOIN HSI.RMOBJECTINSTANCE1247 SXC ON SXC.FK2908 = CT.OBJECTID
               LEFT JOIN HSI.RMOBJECTINSTANCE1229 SI ON SI.OBJECTID = SXC.FK2907
                INNER JOIN HSI.RMOBJECTINSTANCE1231 C ON CT.FK2927 = C.OBJECTID
        ";
        private const string where = @"
                WHERE CT.ACTIVESTATUS = 0
                AND CT.ATTR2739 LIKE '{0}'
                AND CT.ATTR2846 LIKE '{1}'
                AND CT.ATTR2812 LIKE '{2}'
                AND AND CONVERT(VARCHAR(14), CT.ATTR2752, 110) LIKE '{3}'
                AND UA.REALNAME LIKE '{4}'
                AND C.ATTR2815 LIKE '{5}'
                AND SI.ATTR2819 LIKE '{6}'
                AND PR.ATTR2817 LIKE '{7}'
                AND P.ATTR2919 LIKE '{8}'
        ";

然后构建您的查询类似于：

private string GetWhere()
    {
        return string.Format(where,
            ddlTaskName.SelectedValue,
            ddlService.SelectedValue,
            ddlStatus.SelectedValue,
            ddlDueDate.SelectedValue,
            ddlOwner.SelectedValue,
            ddlClient.SelectedValue,
            ddlSite.SelectedValue,
            ddlPractice.SelectedValue,
            ddlProvider.SelectedValue
            );
    }

    private string GetGridSelect()
    {
        return string.Concat(StrMainQuery, _from, GetWhere());
    }

然后您可以使用上面的 union all 方法为每个下拉列表构建查询以保持“全部”

    private void ReloadDropDown()
    {
        dsPopulateProvider.SelectCommand = GetDropDownGuery();
        ddlProvider.DataBind();
    }

通过创建此选择的视图然后使用实体框架，您将受益匪浅。可以非常简单地一举获得所有项目的价值，但我的答案是基于你目前正在做的事情。

我将采取的步骤来进行这些更改

在加载方法上方为 select 语句添加 const vars
添加获取 where 子句的方法（上例）
添加方法以获取网格视图的完整选择语句（上例）
在当前数据绑定和网格视图的方法中拉取所有构建where子句的代码，并从刚刚添加的方法中获取select语句
添加方法为每个下拉菜单构建不同的选择语句并重新绑定它们，如上所示

如果您有任何问题，请告诉我，希望对您有所帮助

【讨论】：

我在PullData 函数中进行过滤，添加每个选择并进行一次查询。如果您需要更好的说明，请告诉我。如果您从中间到底部查看整个代码隐藏，就是 PullData 函数，它会在每次更改 DropDownList 时进行过滤。
我应该从我在页面本身中使用的 DropDownList 中删除 SQLDATASOURCE 并使其动态化吗？
@SearchForKnowledge，你可以保持数据源不变，继续修改select语句。
谢谢...现在把它放在一起：/
嘿只是想知道...什么时候可以再次帮助我:) 谢谢。，