Question

我正在嵌套三个GridView，每个GridView依赖于之前的一个。我完成了asp结构，每个都从各自的数据源（asp：aspx页面中的asp：SqlDataSource）中提取。但是，我无法弄清楚如何构建关系，因此每个只提取与嵌套网格的行相关的数据。

实施例： Similar but I don't need the drill downs

Also very like what I'm looking for but this uses EntityDataSource

这些示例帮助我理解我将需要RowDataBound事件来使其工作。大！但我无法弄清楚如何让RowDataBound事件为每行提供必须通过我的数据源运行的唯一参数，该数据源在下一个GridView中生成数据。

代码隐藏：

    protected void CategoryGrid_Selecting(object sender, SqlDataSourceSelectingEventArgs e)
{
    //need to set my @catlinkulink parameter here
}

protected void CategoryGrid_SelectedIndexChanged(object sender, EventArgs e)
{

}


protected void CategoryOnRowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        GridView CategoryGridFC = DomainGrid.Rows[e.Row.RowIndex].FindControl("CategoryGrid") as GridView;
        string catlinkulink = CategoryGridFC.DataKeys[e.Row.RowIndex].Values["catlinkulink"].ToString();

        TargetLinks.SelectParameters[0].DefaultValue = catlinkulink;
    }
}

这是aspx的数据源。这适用于网格，该网格取决于从前一类别网格的每一行拉出的参数。

    <asp:SqlDataSource ID="TargetLinks" runat="server"
ConnectionString="<%$ ConnectionStrings:MyDB %>"
SelectCommand="SELECT t.ULink AS targetlinkulink, TargetDE
               FROM targetLink t
                  INNER JOIN IntTargets it ON t.TargetULink = it.ULink
                  INNER JOIN IntCategoryLink cl ON t.CatLinkULink = cl.ULink
                  WHERE t.CatLinkULink = @catlinkulink"
>
<SelectParameters>
   <asp:Parameter Name="catlinkulink" DefaultValue="0" Type="Empty" Size="0" ConvertEmptyStringToNull="False" DbType="Object" />
</SelectParameters>

</asp:SqlDataSource>

我为这多久而道歉，但我想确保提供足够的信息以清楚地了解我正在尝试做什么。感谢您提供的任何输入。我总是在这里学到很多东西 - 即使这是一种不同的或更好的方法来完成某些事情。

我根据下面的建议添加了TargetLinks位。我还更改了CategoryGrid的FindControl以查看DomainGrid（其父级）的行，但这也不起作用。

错误：索引超出范围。必须是非负数且小于集合的大小。参数名称：index

以下是嵌套GridView的代码。

    <asp:GridView ID="DomainGrid" runat="server" 
    onselectedindexchanged="DomainGrid_SelectedIndexChanged" 
    DataSourceID="DomainLinks" AutoGenerateColumns="False" DataKeyNames="domainlinkulink">
    <Columns>

        <asp:BoundField DataField="DomainDE" ShowHeader="False" 
                SortExpression="DomainDE" HeaderStyle-Width="125">      
        </asp:BoundField>

        <asp:TemplateField ShowHeader="False">
            <ItemTemplate>
                <asp:DropDownList ID="IntervCatDrop" runat="server" DataSourceID="IntervCatDD"
                 DataValueField="ulink" DataTextField="IntCategories">
                </asp:DropDownList>&nbsp;<asp:Button ID="AddIntCat" runat="server" Text="+" />
            </ItemTemplate>
        </asp:TemplateField>

        <asp:TemplateField ShowHeader="False">
            <ItemTemplate>
                <asp:GridView ID="CategoryGrid" runat="server" DataKeyNames="catlinkulink"
                DataSourceID="IntCategoryLinks" AutoGenerateColumns="false"
                onselectedindexchanged="CategoryGrid_SelectedIndexChanged"
                onrowdatabound="CategoryOnRowDataBound">
                <Columns>

                    <asp:BoundField DataField="IntCategories" ShowHeader="False" 
                        SortExpression="Categories" HeaderStyle-Width="125"></asp:BoundField>

                    <asp:TemplateField ShowHeader="False">
                         <ItemTemplate>
                              <asp:DropDownList ID="TargetDrop" runat="server" DataSourceID="TargetsDD"
                               DataValueField="ulink" DataTextField="TargetDE">
                               </asp:DropDownList>&nbsp;<asp:Button ID="AddTarget" runat="server" Text="+" />
                         </ItemTemplate>
                   </asp:TemplateField>    

                  <asp:TemplateField ShowHeader="false">
                    <ItemTemplate>
                            <asp:GridView ID="TargetGrid" runat="server" DataSourceID="TargetLinks" AutoGenerateColumns="False"
                            DataKeyNames="targetlinkulink" onselectedindexchanged="TargetGrid_SelectedIndexChanged"
                            >
                                <Columns>
                                    <asp:BoundField DataField="TargetDE" ShowHeader="false" SortExpression="TargetDE" />
                                </Columns>
                            </asp:GridView>
                        </ItemTemplate>
                  </asp:TemplateField>

                </Columns>
                </asp:GridView>
            </ItemTemplate>            
        </asp:TemplateField>
    </Columns>





</asp:GridView>

Answer 1

首先，我建议更改看似错误的Parameter。假设CatLinkULink是一个字符串字段，我会将SelectParameters更改为：

<SelectParameters>
    <asp:Parameter Name="catlinkulink" Type="String" DefaultValue=""  />
</SelectParameters>

并在CategoryGrid中移动SqlDataSource，添加一个隐藏字段。以下是CategoryGrid标记的外观：

<asp:gridview id="CategoryGrid" runat="server" datakeynames="catlinkulink"
    datasourceid="IntCategoryLinks" autogeneratecolumns="false"
    onselectedindexchanged="CategoryGrid_SelectedIndexChanged"
    onrowdatabound="CategoryOnRowDataBound">
    <Columns>
        <asp:BoundField DataField="IntCategories" ShowHeader="False"
            SortExpression="Categories" HeaderStyle-Width="125"></asp:BoundField>
        <asp:TemplateField ShowHeader="False">
            <ItemTemplate>
                <asp:DropDownList ID="TargetDrop" runat="server" DataSourceID="TargetsDD"
                    DataValueField="ulink" DataTextField="TargetDE">
                </asp:DropDownList>&nbsp;<asp:Button ID="AddTarget" runat="server" Text="+" />
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField ShowHeader="false">
            <ItemTemplate>
                <asp:GridView ID="TargetGrid" runat="server" DataSourceID="TargetLinks" AutoGenerateColumns="False"
                    DataKeyNames="targetlinkulink" OnSelectedIndexChanged="TargetGrid_SelectedIndexChanged">
                    <Columns>
                        <asp:BoundField DataField="TargetDE" ShowHeader="false" SortExpression="TargetDE" />
                    </Columns>
                </asp:GridView>
                <asp:HiddenField ID="hdnCatlinkulink" runat="server" Value='<%#Eval("catlinkulink") %>' />
                <asp:SqlDataSource ID="TargetLinks" runat="server"
                ConnectionString="<%$ ConnectionStrings:MyDB %>"
                SelectCommand="SELECT t.ULink AS targetlinkulink, TargetDE
                                FROM targetLink t
                                    INNER JOIN IntTargets it ON t.TargetULink = it.ULink
                                    INNER JOIN IntCategoryLink cl ON t.CatLinkULink = cl.ULink
                                    WHERE t.CatLinkULink = @catlinkulink">
                    <SelectParameters>
                        <asp:Parameter Name="catlinkulink" Type="String" DefaultValue=""  />
                    </SelectParameters>
                </asp:SqlDataSource>
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:gridview>

在代码中我会设置参数：

protected void CategoryOnRowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        GridView TargetGrid = e.Row.FindControl("TargetGrid") as GridView;
        HiddenField hdnCatlinkulink = e.Row.FindControl("hdnCatlinkulink") as HiddenField;
        SqlDataSource TargetLinks = e.Row.FindControl("TargetLinks") as SqlDataSource;

        if (TargetGrid != null && hdnCatlinkulink != null && TargetLinks != null)
        {
            string catlinkulink = hdnCatlinkulink.Value;
            TargetLinks.SelectParameters[0].DefaultValue = catlinkulink;
        }
    }
}

免责声明：我没有测试上面的代码，可能需要调整一下。

Answer 2

您可以在hiden div中设置文本框，以便在触发网格选定事件时获取值。然后你可以在sqldatasource中设置这个textbox.text的参数。这就是我为这种情况所做的事情

将参数从父级传递给子级ASP GridView（后面的C＃代码）

2 个答案: