如何将每个文本框的值更新到gridview中的每一行列，然后将值更新到数据库中

Question

在编码过程中遇到了一些困难，求助于大家。我在 gridview 中添加了文本框，并在 gridview 中绑定了数据库详细信息。文本框的用途是更新名为 "Total Quantity Redeemed" 的列中的值。我编写了以下代码，但出现了问题。对于所有列值，只有最后一行文本框值会更新。例如，我的最后一行文本框值为“2”，数据库会将 "Total Quantity Redeemed" 的所有列更新为 2。这可能是因为我的 for 循环？或者我应该使用 rowdatabound？希望有人能解开我的疑惑，谢谢

我的 HTML 代码（网格视图）

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" BorderWidth="1px" 
        CellPadding="3" GridLines="Vertical" HeaderStyle-Height="30px" style="border-left-color: black; border-bottom-color: black; border-top-style: dashed; border-top-color: black; border-right-style: dashed; border-left-style: dashed; background-color: silver; border-right-color: black; border-bottom-style: dashed" BackColor="White" BorderColor="#999999" BorderStyle="None">
        <Columns>
        <asp:TemplateField  HeaderText="Transaction No" >
                <HeaderStyle HorizontalAlign="Left" Width="70px"/>
                <ItemTemplate>
                    <asp:Label ID="lblTransactionNo" runat="server" text='<%# Eval("TransactionNo") %>'></asp:Label>
                </ItemTemplate>
            </asp:TemplateField>

            <asp:BoundField DataField="PaymentDateTime" HeaderText="Payment Date Time">
                <HeaderStyle HorizontalAlign="Left" />
            </asp:BoundField>
            <asp:BoundField DataField="ItemCode" HeaderText="Ticket Code"  >
                <HeaderStyle HorizontalAlign="Left" Width="65px"/>
            </asp:BoundField>
            <asp:BoundField DataField="programdesc" HeaderText="Program Description">
                <HeaderStyle HorizontalAlign="Left" Width="95px" />
            </asp:BoundField>

            <asp:TemplateField  HeaderText="Quantity Available">
                <HeaderStyle HorizontalAlign="Left" Width="70px"/>
                <ItemTemplate>
                    <asp:Label ID="lblAvailable" runat="server" text='<%# Eval("Quantity") %>'></asp:Label>
                </ItemTemplate>
            </asp:TemplateField>
            <asp:TemplateField  HeaderText="Total Quantity Redeemed">
                <HeaderStyle HorizontalAlign="Left" Width="70px"/>
                <ItemTemplate>
                    <asp:Label ID="lblRedeemedQty" runat="server" text='<%# Eval("RedeemedQuantity") %>'></asp:Label>
                </ItemTemplate>
            </asp:TemplateField>
            <asp:TemplateField HeaderText="Quantity to Redeem" ShowHeader="False">
            <HeaderStyle HorizontalAlign="Left" Width="95px" />
                <ItemTemplate>
                    <asp:TextBox ID="txtRedeem" runat="server" Text="0"></asp:TextBox>
                     <asp:CompareValidator Display="Dynamic" ID="CompareValidator1" Operator="DataTypeCheck" Type="Integer"  runat="server" ErrorMessage="Only Integer!" ControlToValidate="txtRedeem"></asp:CompareValidator>
                     <asp:RequiredFieldValidator Display="Dynamic" ID="RequiredFieldValidator1" runat="server" ErrorMessage="Key In Value!" ControlToValidate="txtRedeem"></asp:RequiredFieldValidator>
                </ItemTemplate>
                <ItemStyle HorizontalAlign="Left" />
            </asp:TemplateField>
        </Columns>

        <HeaderStyle CssClass="gridheader" Height="30px" BackColor="#000084" Font-Bold="True" ForeColor="White" />
        <AlternatingRowStyle CssClass="gridaltrow" BackColor="#DCDCDC" />
        <RowStyle CssClass="gridrow" BackColor="#EEEEEE" ForeColor="Black" />
        <FooterStyle BackColor="#CCCCCC" ForeColor="Black" />
        <PagerStyle BackColor="#999999" ForeColor="Black" HorizontalAlign="Center" />
        <SelectedRowStyle BackColor="#008A8C" Font-Bold="True" ForeColor="White" />
    </asp:GridView>

我的后台代码

Partial Class _Default
    Inherits System.Web.UI.Page

    Dim sqlQuery As String
    Dim conn As SqlConnection = New SqlConnection("Server=gsc-volvo-Hp;Database=GET_PANORAMA;Trusted_Connection=True;")
    Dim cmd As SqlCommand
    'Dim dr As SqlDataReader
    Dim da As SqlDataAdapter = New SqlDataAdapter()


    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        If (Page.IsPostBack = False) Then

            Dim cmd As SqlCommand
            'Dim dr As SqlDataReader
            Dim da As SqlDataAdapter = New SqlDataAdapter()

            conn.Open()
            sqlQuery = "SELECT webtpay_trn.*,PaymentDateTime from webtrcp_trn inner join webtpay_trn on (webtrcp_trn.TransactionNo = webtpay_trn.TransactionNo)"
            cmd = New SqlCommand(sqlQuery, conn)
            da.SelectCommand = New SqlCommand(sqlQuery, conn)

            GridView1.DataSource = cmd.ExecuteReader()
            GridView1.DataBind()
            conn.Close()
        End If

    End Sub




Private Sub CheckQty()
Dim row As GridViewRow
Dim total As Integer
lblMessage.Text = ""

For Each row In GridView1.Rows
    Dim lblAvailable As Integer
    Dim lblRedeemedQty As Integer
    Dim amtRedeem As Integer
    Dim transNo As String

    ' write ur DB process code here

    row.ForeColor = Drawing.Color.Empty
    lblMessage.ForeColor = Drawing.Color.Empty

    Try
        lblAvailable = CType(row.FindControl("lblAvailable"), Label).Text
        amtRedeem = CType(row.FindControl("txtRedeem"), TextBox).Text
        lblRedeemedQty = CType(row.FindControl("lblRedeemedQty"), Label).Text
        transNo = CType(row.FindControl("lblTransactionNo"), Label).Text

    Catch ex As Exception
        lblError.ForeColor = System.Drawing.Color.Red
        lblError.Text = "** Error Occur In Quantity Redeem.Default=0 **"
    End Try

    total = total + amtRedeem

    If (amtRedeem > lblAvailable) Or amtRedeem < 0 Then
        lblMessage.ForeColor = System.Drawing.Color.Red
        lblMessage.Text = "** Quantity Error or Insufficient. Please Check Your Redeem Quantity **"

        row.ForeColor = Drawing.Color.Red
        row.Focus()

        Exit For

    ElseIf total = 0 Then
        lblMessage.ForeColor = System.Drawing.Color.Red
        lblMessage.Text = "** No Amount Entered. Please Enter Some Value **"

    Else


    sqlQuery = sqlQuery + "Update WebTpay_Trn set RedeemedQuantity =RedeemedQuantity + '" & amtRedeem & "' "
    sqlQuery = sqlQuery + " WHERE webtpay_trn.TransactionNo = '" & transNo & "'  "
        Dim cmd As SqlCommand = New SqlCommand(sqlQuery, conn)

        conn.Open()
        cmd.ExecuteNonQuery()
        conn.Close()

        'lblMessage.ForeColor = System.Drawing.Color.Green
        lblMessage.Text = " Total Redeem =  " + total.ToString + " Tickets "
        'Response.Redirect("showTicketRedeem.aspx")
    End If

Next
End Sub


    Protected Sub btnRedeem_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnRedeem.Click

        CheckQty()

    End Sub

End Class

Answer 1

好的，我想问题是您已经声明了变量 amtRedeem and total outside the loop，因此这些变量在下一次迭代中保持 old values。所以你需要声明这些inside the loop。我不确定变量 total 但 amtRedeem 必须在循环内。

For Each row In GridView1.Rows
Dim amtRedeem As Integer
Dim total As Integer
//Rest of your code will remain same.

Answer 2

认为可能是SQL更新语句

 UPDATE WebTpay_Trn set RedeemedQuantity = '" & amtRedeem & "' 
 FROM webtrcp_trn INNER JOIN webtpay_trn ON 
 (webtrcp_trn.TransactionNo = webtpay_trn.TransactionNo)

没有 WHERE 语句，因此每个 RedeemedQuantity 字段都使用当前行的 txtRedeem 文本框的值进行更新。

添加一个项目模板来保存每一行的 TransactionNo，就像您为 RedeemedQuantity 所做的那样

 <asp:TemplateField  HeaderText="TransactionNo">
            <ItemTemplate>
             <asp:Label ID="lblTransactionNo" runat="server" text='<%# Eval("TransactionNo") %>'>
             </asp:Label>
           </ItemTemplate>
       </asp:TemplateField>

添加一个变量来保存该行的交易编号（例如使用名为 lblTransactionNo 的标签）

Dim transactionNo as string = lblTransactionNo.Text

您需要添加引用该行的 TransactionNo

的 WHERE 语句

类似

sqlQuery = String.Format("UPDATE WebTpay_Trn set RedeemedQuantity = {0} 
WHERE webtrcp_trn.TransactionNo = {1}", amtRedeem, transactionNo)

Answer 3

我不确定这是否是解决方案，但我的值可以毫无问题地获取每个文本框并将其插入到每个特定行，感谢 Peter Campbell 和 Mairaj Ahmad 的帮助。

持有我的交易号如下： Dim lblTransactionNo As Label = DirectCast(row.FindControl("lblTransactionNo"), 标签)

sqlQuery = "Update WebTpay_Trn set RedeemedQuantity = RedeemedQuantity + '" & amtRedeem & "' "
                    sqlQuery = sqlQuery + " WHERE TransactionNo = '" & lblTransactionNo.Text & "' "
                    'sqlQuery = String.Format("UPDATE WebTpay_Trn set RedeemededQuantity = {0} WHERE webtPay_trn.TransactionNo = {1}", amtRedeem, lbltransactionNo)

                    Dim cmd As SqlCommand = New SqlCommand(sqlQuery, conn)

                    conn.Open()
                    cmd.ExecuteNonQuery()
                    conn.Close()

如何将每个文本框的值更新到gridview中的每一行列，然后将值更新到数据库中

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