VB.NET语法规则有哪些

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VB.NET语法规则实例1：

同 Integer 类型的变量比较

1. Public Class CompareForm

2. Private Sub Button1_Click
   (ByVal sender As System.Object,
   ByVal e As System.EventArgs)
   Handles Button1.Click

3. Dim A As Integer = 10

4. Dim B As Integer = 20

5. If A <= B Then

6. MessageBox.Show("提示：A<=B")

7. Else

8. MessageBox.Show("提示：A>B")

9. End If

10. End Sub

11. End Class

VB.NET语法规则实例2：

Boolean变量的比较

1. ublic Class LogicForm

2. Private Sub Button1_Click(ByVal
   sender As System.Object, ByVal e
   As System.EventArgs) Handles
   Button1.Click

3. Dim a As Boolean = True

4. Dim b As Boolean = False

5. If a And b = True Then ''
   和If a And b Then相同

6. MessageBox.Show("提示：a和b都是True ")

7. Else

8. MessageBox.Show("提示：a和b有一个不是True ")

9. End If

10. End Sub

11. End Class

VB.NET语法规则实例3：

同String类型变量比较 String和Integer不同变量的比较

1. Public Class StrForm

2. Private Sub Button1_Click(ByVal
   sender As System.Object, ByVal e
   As System.EventArgs) Handles
   Button1.Click

3. Dim str1, str2 As String

4. str1 = "Hello"

5. str2 = "World"

6. MessageBox.Show("提示：" &
   str1 + " " + str2) ''Message
   Box.show(str1 & " " & str2)也可以

7. End Sub

8. Private Sub Button2_Click(ByVal
   sender As System.Object, ByVal e
   As System.EventArgs) Handles
   Button2.Click

9. Dim z As Integer

10. Dim x As String = " 100"

11. z = 50

12. MessageBox.Show(x & z) ''
    MessageBox.Show(x + z)

13. End Sub

14. End Class

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