Question

您好我正在使用microsoft visual studio 2010版本，我需要在其上制作一个if语句。

我正在做的是将一个数字放入文本框，然后进入我的列表框（不过我多次将数字放入3-4个数字）。然后它意味着将它们全部添加并在之后将其放入标签中。

到目前为止，这是该计划的目标

Public Class Form1

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        Dim Result As Integer
        For Each Item As Integer In ListBox1.Items
            Result = Result + Item
        Next
    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim Value As String
        Value = TextBox1.Text
        ListBox1.Items.Add(Value)
    End Sub

    Private Sub Label1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Label1.Click
        Label1.Text = "You have a Balance of " + DialogResult.ToString
    End Sub

    Private Sub TextBox1_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TextBox1.TextChanged

    End Sub

    Private Sub ListBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ListBox1.SelectedIndexChanged
        If (String.a
    End Sub
End Class

Answer 1

在Visual Basic .NET中（您的代码看起来就是这样），If语句的格式如下：

If condition Then DoSomeCodeHere() End If

C＃代码格式为

if (condition) 
{
  DoSomeCodeHere();
}

Answer 2

你的意思是你把列表框中的所有金额都计算在一起，并在点击按钮2后将其显示在标签中？如果是，请添加以下内容。

 Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
    Dim Result As Integer
    For Each Item As Integer In ListBox1.Items
        Result = Result + Item
    Next
    Label1.Text = "You have a Balance of " + Result.ToString
 End Sub

IF声明没有像我预期的那样工作

2 个答案: