c# - e.Row.findcontrol() 在数据绑定(bind)后返回 null 但所有数据绑定(bind)字段都正常工作

Question

我正在尝试获取一个 gridview 来填充从数据库调用到我的 Label 的文本，如图所示 结果已经过测试并返回正确的名称

protected void Page_Load(object sender, EventArgs e)
{
    DataTable t = DBProductLink.ListWithOptions(ProductId, LinkType, null);
    TestList.DataSource = t ;
    TestList.DataBind();
}

标签在 Gridview 中是这样创建的:

<asp:GridView ID="TestList" runat="server" OnRowDataBound="testDataBound" AutoGenerateColumns="false" DataKeyNames="Id">
    <Columns>
        <asp:TemplateField HeaderText="Sizes">
            <asp:ItemTemplate>
                <asp:Label ID="sizeLabel" runat="server" Text='<%# Eval("size") %>' />
            </asp:ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>

然后我尝试循环遍历 gridview 并使用 ondatarowbound 访问标签，但是在这个标签中它是空的。

protected void testDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType != DataControlRowType.DataRow)
        return;

    Label sizeLabel = e.Row.FindControl("sizeLabel") as Label;
    sizeLabel.Text = "test";
}

我在同一页面上使用不同名称的另一个 gridview 上使用完全相同的设置，其中有 2 个下拉框和 2 个标签，但没有这个问题。有人对此有想法吗？另一个Gridview如下:

<asp:GridView ID="SearchList" runat="server" AutoGenerateColumns="False"
    DataKeyNames="Id"  OnRowDataBound="SearchList_RowDataBound"
    OnRowCommand="SearchList_RowCommand" Width="100%"  PageSize="20" >
    <Columns>
        <asp:BoundField DataField="Code" HeaderText="Code" SortExpression="Code" />
        <asp:BoundField DataField="Name" HeaderText="Name" SortExpression="Name" />
        <asp:TemplateField HeaderText="Price" SortExpression="Price">
            <ItemTemplate>
                <robo:MoneyLabel ID="MoneyLabel2" runat="server" 
                    Value='<%# Eval("Price") %>' />
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Type">
            <ItemTemplate>
                <asp:Label ID="typeLabel" runat="server" Text='<%# Eval("Type") %>' />
                <asp:HiddenField ID="productId" runat="server" Value='<%# Eval("Id") %>' />
                <asp:HiddenField ID="isFabric" runat="server" Value='<%# Eval("IsFabric") %>' />
                <asp:HiddenField ID="isOldWizard" runat="server" Value='<%# Eval("IsOldWizard") %>' />
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Options/Color/Size">
            <ItemTemplate>
                <asp:LinkButton runat="server" ID="GetOptions" Text="Get Options" CausesValidation="false" CommandName="Options"  />
                <asp:Label ID="OptionLabel" Visible="false" runat="server" Text="Option: " />
                <asp:DropDownList ID="ProductOptions" runat="server" Visible="false" />
                <asp:Label ID="ColorLabel" Visible="false" runat="server" Text="Color: "  />
                <asp:DropDownList  ID="RibbonColors" runat="server" Visible="false" AutoPostBack="true" />&nbsp;&nbsp;&nbsp;&nbsp;
                <asp:Label ID="SizeLabel" Visible="false" runat="server" Text="Size: " />
                <asp:DropDownList ID="RibbonSizes" runat="server" Visible="false" AutoPostBack="true"  />
            </ItemTemplate>
            <ItemStyle HorizontalAlign="Center" />
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Add">
            <ItemStyle Width="60px" />
            <ItemTemplate>
                <asp:LinkButton ID="LinkButton1" runat="server" Text="Add" CommandName="Add" CommandArgument='<%# Eval("Id") %>' />
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>

.cs 是

protected void SearchList_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType != DataControlRowType.DataRow)
        return;
    int productId = (int)SearchList.DataKeys[e.Row.RowIndex].Value;
    LinkButton GetOptions = e.Row.FindControl("GetOptions") as LinkButton;
    DropDownList RibbonColors = e.Row.FindControl("RibbonColors") as DropDownList;
    DropDownList  RibbonSizes = e.Row.FindControl("RibbonSizes") as DropDownList;
    DropDownList ProductOptions = e.Row.FindControl("ProductOptions") as DropDownList;
    Label typeLabel = e.Row.FindControl("typeLabel") as Label;
    HiddenField isFabric = e.Row.FindControl("isFabric") as HiddenField;
    HiddenField isOldWizard = e.Row.FindControl("isOldWizard") as HiddenField;

    ProductType typeValue = DBConvert.ToEnum<ProductType>(typeLabel.Text);
    bool isFabricValue = Convert.ToBoolean(isFabric.Value.ToString());
    bool isOldWizardValue = Convert.ToBoolean(isOldWizard.Value.ToString());       
}

Answer 1

刚刚发现问题

你的标记是错误的，它很棘手......我承认

这个标签:<asp:ItemTemplate>应该是 <ItemTemplate>

改变这个:

<asp:TemplateField HeaderText="Sizes">
    <asp:ItemTemplate>
         <asp:Label ID="sizeLabel" runat="server" Text='<%# Eval("size") %>' />
    </asp:ItemTemplate>
</asp:TemplateField>

进入

<asp:TemplateField HeaderText="Sizes">
    <ItemTemplate>
         <asp:Label ID="sizeLabel" runat="server" Text='<%# Eval("size") %>' />
    </ItemTemplate>
</asp:TemplateField>

这应该引发异常...但是，ItemTemplate完全被忽略了