我在编码和寻求每个人的帮助时遇到了一些困难。 我在gridview中添加了文本框，并在gridview中绑定了数据库详细信息。 文本框的目的是更新名为“Total Redeemed Total”的列中的值。 我编写了以下代码，但问题出现了。 只有最后一行文本框值才会更新所有列值。 例如，我的最后一行文本框值为'2'，数据库会将“Total Redeemed Total”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？ 希望有人可以清除我的疑问，谢谢。
我的HTML代码（Gridview）
<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>
我背后的代码
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
答案 0 :(得分：0)
好吧我想问题是你已经声明了变量amtRedeem and total outside the loop所以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.
答案 1 :(得分：0)
认为它可能是SQL更新语句
series: [{
data: [
[0, 291],
[1, 289],
[2, 289],
[3, 285],
[4, 284],
[5, 283],
[6, 263]
],
color: '#FF0000'
}, {
data: [
[7, 135],
[8, 119],
[9, 100],
[10, 96],
[11, 89],
[12, 80],
[13, 65],
[14, 60],
[15, 57],
[16, 46],
[17, 20]
],
color: '#1aadce'
}]
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。
添加项目模板以保存每一行的TransactionNo，就像您为RedeemedQuantity所做的那样
UPDATE WebTpay_Trn set RedeemedQuantity = '" & amtRedeem & "'
FROM webtrcp_trn INNER JOIN webtpay_trn ON
(webtrcp_trn.TransactionNo = webtpay_trn.TransactionNo)
添加一个变量来保存该行的Transaction No（例如使用名为lblTransactionNo的标签）
<asp:TemplateField HeaderText="TransactionNo">
<ItemTemplate>
<asp:Label ID="lblTransactionNo" runat="server" text='<%# Eval("TransactionNo") %>'>
</asp:Label>
</ItemTemplate>
</asp:TemplateField>
您需要添加引用该行的TransactionNo
的WHERE语句像
这样的东西Dim transactionNo as string = lblTransactionNo.Text
答案 2 :(得分：0)
我不确定它是否是解决方案，但我的价值可以得到并将每个文本框插入每个特定行而没有问题，感谢Peter Campbell和Mairaj Ahmad的帮助。
按我的指示执行以下操作： Dim lblTransactionNo As Label = DirectCast（row.FindControl（“lblTransactionNo”），Label）
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()