Question

我想从密码背后的电网观点中获取一个隐蔽领域的价值,但不在<代码>_RowDataBound或任何其他类似方法中使用。这里是我目前的法典(它是一种购物假想):

<asp:GridView ID="gvShoppingCart"
runat="server"
AutoGenerateColumns="False"
AllowPaging="True"
DataKeyNames="ID"
ShowFooter="true">
<Columns>
    <asp:TemplateField>
        <ItemTemplate>
            <asp:HiddenField ID="lblProductID" runat="server" Text= <%# Eval("ProductID") %>  />
        </ItemTemplate>
    </asp:TemplateField>
    <asp:TemplateField HeaderText="Product">
        <ItemTemplate>
            <asp:HyperLink ID="HyperLink1" runat="server" 
                NavigateUrl= <%# Eval("ProductID", "product_details.aspx?id={0}") %>  
                Text= <%# GetProduct(Eval("ProductID")) %> ></asp:HyperLink>
        </ItemTemplate>
    </asp:TemplateField>
    <asp:TemplateField HeaderText="Quantity">
        <ItemTemplate>
            <asp:TextBox ID="txtQuantity" runat="server" Width="35" CssClass="input" onkeypress="return isNumberKey(event)" AutoPostBack="true" ontextchanged="txtQuantity_TextChanged"></asp:TextBox>
        </ItemTemplate>
    </asp:TemplateField>
</Columns>

For the sake of brevity I removed certain fields since they are there only for the display. The Quantity field is there for the user to input a number to add a number of products to his cart. I wish to access the lblProductID label in the _TextChanged event. In this same event, I tried

ID = (Label)gvShoppingCart.FindControl(“lblProductID”);

but it didn t work and returns only a null value. What is the solution?

Answer 1

For each row in your GridView there is a HiddenField for the ProductID.

可以通过使用以下代码(假设<代码>Hidden Field(例如,在第一行)进入:

HiddenField hiddenFieldProductID = 
           (HiddenField)gvShoppingCart.Rows[0].Cells[0].FindControl("lblProductID");

string productID = hiddenFieldProductID.Value

// Do something with the value

Hope, this helps.

Answer 2

Try to replace the HiddenField to a label or a textbox and set the visible attribute to false. I had tried this before and it works.

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