我有一个嵌套的网格视图：
<asp:GridView ID="gvRequisitions" runat="server" AutoGenerateColumns="false"
DataKeyNames="PurchaseRequisitionID" OnRowDataBound="OnRowDataBound" ShowFooter="true">
<Columns>
<asp:TemplateField>
<ItemTemplate>
<img alt="" style="cursor:pointer" src="../images/plus.png" width="12" height="12" />
<asp:Panel ID="pnlItems" runat="server" Style="display: none">
<asp:GridView ID="gvItems" runat="server" AutoGenerateColumns="false" ShowFooter="true"
OnRowDataBound="gvItems_RowDataBound">
<Columns>
<asp:TemplateField HeaderText="ID">
<ItemTemplate>
<asp:Label ID="lblItemID" runat="server" Text='<%# Eval("ItemID") %>'></asp:Label>
</ItemTemplate>
<FooterTemplate>
<asp:Button ID="btnAddItem" runat="server" OnClick="addItem" Text="add" />
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Item Code">
<ItemTemplate>
<asp:Label ID="lblItemCode" runat="server" Text='<%# Eval("ItemCode") %>'></asp:Label>
</ItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtItemCode" runat="server" Visible="true" Width="100"></asp:TextBox>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Description">
<ItemTemplate>
<asp:Label ID="lblDescription" runat="server" Text='<%# Eval("Description") %>'
Width="225"></asp:Label>
</ItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtDescription" runat="server" Width="225"></asp:TextBox>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Date req.">
<ItemTemplate>
<asp:Label ID="lblDateRequired" runat="server" Text='<%# Eval("DateRequired") %>'
Width="75"></asp:Label>
</ItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtDateRequired" runat="server" Width="75"></asp:TextBox>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Measure">
<ItemTemplate>
<asp:Label ID="lblMeasure" runat="server" Text='<%# Eval("MeasureID") %>'
Width="120" ></asp:Label>
</ItemTemplate>
<FooterTemplate>
<asp:DropDownList ID="ddlMeasure" runat="server" Width="120"></asp:DropDownList>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Qty">
<ItemTemplate>
<asp:Label ID="lblQuantity" runat="server" Text='<%# Eval("Quantity") %>' Width="75"></asp:Label>
</ItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtQuantity" runat="server" Width="75"></asp:TextBox>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Cost">
<ItemTemplate>
<asp:Label ID="lblCostPerUnit" runat="server" Text='<%# Eval("CostPerUnit") %>' Width="75"></asp:Label>
</ItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtCostPerUnit" runat="server" Width="75"></asp:TextBox>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Total">
<ItemTemplate>
<asp:Label ID="lblTotal" runat="server" Text='<%# Eval("Total") %>' Width="120"></asp:Label>
</ItemTemplate>
</asp:TemplateField>
</Columns>
<EmptyDataTemplate>No Items For this Requisition</EmptyDataTemplate>
</asp:GridView>
</asp:Panel>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="ID">
<ItemTemplate>
<asp:Label ID="lblPurchaseRequisitionID" runat="server" Text='<%# Eval("PurchaseRequisitionID") %>'>
</asp:Label>
</ItemTemplate>
<FooterTemplate>
<asp:Button ID="btnAddReq" runat="server" Text="Add" OnClick="addPurreq" />
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Requested By">
<ItemTemplate>
<asp:Label ID="lblRequestor" runat="server" Text='<%# Eval("Requestor") %>'>
</asp:Label>
</ItemTemplate>
<FooterTemplate>
<asp:DropDownList ID="ddlRequestor" runat="server" Width="200"></asp:DropDownList>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Department">
<ItemTemplate>
<asp:Label ID="lblDepartmentID" runat="server" Text='<%# Eval("DepartmentID") %>'></asp:Label>
</ItemTemplate>
<FooterTemplate>
<asp:DropDownList ID="ddlDepartment" runat="server" Width="200" ></asp:DropDownList>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Budget">
<ItemTemplate>
<asp:Label ID="lblBudgetID" runat="server" Text='<%# Eval("BudgetID") %>'></asp:Label>
</ItemTemplate>
<FooterTemplate>
<asp:DropDownList ID="ddlBudget" runat="server" Width="200"></asp:DropDownList>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Supplier">
<ItemTemplate>
<asp:Label ID="lblSupplierID" runat="server" Text='<%# Eval("SupplierID") %>'></asp:Label>
</ItemTemplate>
<FooterTemplate>
<asp:DropDownList ID="ddlSupplier" runat="server" Width="200"></asp:DropDownList>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Created">
<ItemTemplate>
<asp:Label ID="lblDateCreated" runat="server" Text='<%# Eval("DateCreated","{0:d}") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
在代码背后我有：
protected void OnRowDataBound(object sender, GridViewRowEventArgs e)
{
if(e.Row.RowType == DataControlRowType.DataRow)
{
string purchaseRequisitionID = gvRequisitions.DataKeys[e.Row.RowIndex].Value.ToString();
GridView gvItems = (GridView)e.Row.FindControl("gvItems");
// new code to send reference to gvItems_RowDataBound
gvItems.RowDataBound += new GridViewRowEventHandler(gvItems_RowDataBound);
int id = Convert.ToInt32(purchaseRequisitionID);
using (SqlConnection conn = new SqlConnection(constr))
{
using(SqlCommand comm = new SqlCommand("procItems_CRUD"))
{
comm.Parameters.AddWithValue("@Action", "SELECT");
comm.Parameters.AddWithValue("@ID", id);
using(SqlDataAdapter sda = new SqlDataAdapter())
{
comm.CommandType = CommandType.StoredProcedure;
comm.Connection = conn;
sda.SelectCommand = comm;
using(DataTable dt = new DataTable())
{
sda.Fill(dt);
gvItems.DataSource = dt;
gvItems.DataBind();
}
}
}
}
}
}
和
protected void gvItems_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
DropDownList ddlMeasure = e.Row.FindControl("ddlMeasure") as DropDownList;
if(ddlMeasure == null)
{
}
}
}
但是我看不到下拉列表，因为它返回一个空值（因为我知道它不是DataRow）但我如何才能看到页脚行和页脚行中的元素，以便我可以添加另一个项目到订购/填充DropDownList等。
一直试图对此进行排序已经有一段时间了，无法找到可行的解决方案，因此非常感谢任何指针。
答案 0 :(得分：0)
您需要使用DataControlRowType.Footer。
protected void gvItems_RowDataBound(object sender, GridViewRowEventArgs e)
{
//check if the row is a footer row
if (e.Row.RowType == DataControlRowType.Footer)
{
DropDownList ddlMeasure = e.Row.FindControl("ddlMeasure") as DropDownList;
if (ddlMeasure != null)
{
ddlMeasure.Items.Insert(0, new ListItem("DLL Found!", "-1"));
}
}
}