[英]Visual Basic how to stop an event after MsgBox is shown
我想確保用戶在我的進一步處理之前檢查了我的 3 個復選框之一,因此我在下面創建了 function 並在他們沒有檢查任何內容時生成一個 Msg。 問題是在消息框之后該過程仍在進行。 那么在顯示這個特定的 msgbox 之后有什么方法可以阻止這個事件?
Private Sub btnPay_Click(sender As Object, e As EventArgs) Handles btnPay.Click
If chkbNotes.Checked = True Then
conn.Open()
sql = "UPDATE Order SET payment_method_id = 1 WHERE Id = '" + FoodMenu.OrderID + "';"
cmd = New SqlCommand(sql, conn)
cmd.ExecuteNonQuery()
Else
If chkbCreditCard.Checked = True Then
conn.Open()
sql = "UPDATE Order SET payment_method_id = 2 WHERE Id = '" + FoodMenu.OrderID + "';"
cmd = New SqlCommand(sql, conn)
cmd.ExecuteNonQuery()
Else
If chkbEwallet.Checked = True Then
conn.Open()
sql = "UPDATE Order SET payment_method_id = 2 WHERE Id = '" + FoodMenu.OrderID + "';"
cmd = New SqlCommand(sql, conn)
cmd.ExecuteNonQuery()
Else
MsgBox("Please choose 1 Payment Method", MsgBoxStyle.Exclamation, "Error")
End If
End If
End If
Dim Amount As String
Amount = InputBox("Enter Paying Amount (EX:100.00)", "Amount")
If (IsNumeric(Amount)) = True Then
.
.
.
這是您的代碼應如下所示:
Private Sub btnPay_Click(sender As Object, e As EventArgs) Handles btnPay.Click
Dim paymentMethodId As Integer
If chkbNotes.Checked Then
paymentMethodId = 1
ElseIf chkbCreditCard.Checked Then
paymentMethodId = 2
ElseIf chkbEwallet.Checked Then
paymentMethodId = 3
Else
MessageBox.Show("Please choose 1 Payment Method", "Error", MessageBoxButtons.OK, MessageBoxIcon.Exclamation)
Return
End If
sql = "UPDATE Order SET payment_method_id = @PaymentMethodId WHERE Id = @Id"
cmd = New SqlCommand(sql, conn)
cmd.Parameters.Add("@PaymentMethodId", SqlDbType.Int).Value = paymentMethodId
cmd.Parameters.Add("@Id", SqlDbType.Int).Value = FoodMenu.OrderID
conn.Open()
cmd.ExecuteNonQuery()
我冒昧地假設 payemtn 方法 ID 在第三種情況下應該是 3,而不是您在原始代碼中使用的 2。
我還建議更改您的 ADO.NEt 代碼,因為您似乎正在重用連接和命令對象。 您應該在需要它們的時間和地點創建和銷毀它們。
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.