gridview中的TextBox不检索数据

Question

我在网格视图中遇到了一些问题。我有一个列为5的网格视图。当我选择从顶部添加项目时，底部的网格视图将刷新。同时，它从数据库中检索一些数据并将其显示在网格视图的文本框中。这是我的按钮动作事件方法：

protected void lbnAdd_Click(object sender, EventArgs e)
    {
        List<ProductPacking> prodVariantDetail = new List<ProductPacking>();

        // get the last product variant IDs from ViewState
        prodVariantIDList = this.SelectedVariantDetailIDs;

        foreach (RepeaterItem ri in Repeater1.Items)
        {
            GridView gvProduct = (GridView)ri.FindControl("gvProduct");
            foreach (GridViewRow gr in gvProduct.Rows)
            {
                CheckBox cb = (CheckBox)gr.FindControl("cbCheckRow");
                if (cb.Checked)
                {
                    // add the corresponding DataKey to idList
                    prodVariantIDList.Add(gvProduct.DataKeys[gr.RowIndex].Value.ToString());
                }
            }
        }
        for (int i = 0; i < prodVariantIDList.Count; i++)
        {
            prodVariantDetail.Add(prodPackBLL.getProdVariantDetailByID(prodVariantIDList[i]));

            foreach (GridViewRow gr in gvFinalised.Rows)
            {
                //Get the product packaging quantity by productName
                string name = gr.Cells[2].Text;
                int productQuantity = packBLL.getProductQuantityByName(name);
                TextBox tb = (TextBox)gr.Cells[5].FindControl("tbQuantity");
                tb.Text = productQuantity.ToString();
            }
        }

        gvFinalised.DataSource = prodVariantDetail;
        gvFinalised.DataBind();

        // save prodVariantIDList to ViewState
        this.SelectedVariantDetailIDs = prodVariantIDList;
    }

然而，它只是让我回来0.我确实检查了SQL语句，都返回了正确的值。有什么方法可以解决这个问题吗？

提前致谢。

修改

<asp:GridView ID="gvFinalised" runat="server" AutoGenerateColumns="False" CellPadding="2" ForeColor="#333333" GridLines="None" Width="740px" DataKeyNames="id">
                            <Columns>
                                <asp:BoundField DataField="id" HeaderText="ID" ItemStyle-Width="50px" />
                                <asp:BoundField DataField="categoryName" HeaderText="Category" ItemStyle-Width="100px" />
                                <asp:BoundField DataField="name" HeaderText="Product" ItemStyle-Width="350px" />
                                <asp:BoundField DataField="inventoryQuantity" HeaderText="Stock" ItemStyle-Width="100px" />
                                <asp:BoundField DataField="unitQuantity" HeaderText="Unit" ItemStyle-Width="100px" />
                                <asp:TemplateField HeaderText="Quantity" ItemStyle-HorizontalAlign="Center" ItemStyle-Width="200px">
                                    <ItemTemplate>
                                        <asp:TextBox ID="tbQuantity" runat="server" Width="40" Text="0" OnTextChanged="tbQuantity_TextChanged" AutoPostBack="true" />
                                        <asp:Label ID="lblCheckAmount" runat="server" ForeColor="#a94442"></asp:Label>
                                    </ItemTemplate>
                                </asp:TemplateField>
                            </Columns>
                        </asp:GridView>

Answer 1

问题是您在绑定数据之前遍历gvFinalised行，因此当您调用gvFinalised.DataBind()时，无论您在循环中执行什么操作都会被覆盖。

快速解决方案

移动它：

foreach (GridViewRow gr in gvFinalised.Rows)
{
    //Get the product packaging quantity by productName
    string name = gr.Cells[2].Text;
    int productQuantity = packBLL.getProductQuantityByName(name);
    TextBox tb = (TextBox)gr.Cells[5].FindControl("tbQuantity");
    tb.Text = productQuantity.ToString();
}

之后：

gvFinalised.DataSource = prodVariantDetail;
gvFinalised.DataBind();

替代解决方案

如下面的@SutharMonil所述，使用RowDataBound事件可以采用另一种方法。首先将OnRowDataBound属性设置为aspx代码中的事件处理程序名称，假设名称为gvFinalised_RowDataBound：

<asp:GridView ID="gvFinalised" runat="server" AutoGenerateColumns="False" CellPadding="2"
        ForeColor="#333333" GridLines="None" Width="740px" DataKeyNames="id" OnRowDataBound="gvFinalised_RowDataBound">

然后在代码后面，删除以下代码：

foreach (GridViewRow gr in gvFinalised.Rows)
{
    //Get the product packaging quantity by productName
    string name = gr.Cells[2].Text;
    int productQuantity = packBLL.getProductQuantityByName(name);
    TextBox tb = (TextBox)gr.Cells[5].FindControl("tbQuantity");
    tb.Text = productQuantity.ToString();
}

并添加以下代码：

protected void gvFinalised_RowDataBound(Object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        // Display the company name in italics.
        e.Row.Cells[1].Text = "<i>" + e.Row.Cells[1].Text + "</i>";

        //Get the product packaging quantity by productName
        string name = e.Row.Cells[2].Text;
        int productQuantity = packBLL.getProductQuantityByName(name);
        TextBox tb = (TextBox)e.Row.Cells[5].FindControl("tbQuantity");
        tb.Text = productQuantity.ToString();
    }
}

这样，只要调用gvFinalised，gvFinalised.DataBind()内的数量文本框就会始终更新。