VB.Net嵌套If语句怎么使用

嵌套If语句的使用方法与普通的If语句类似，只是在If语句中再次嵌套了一个或多个If语句。

下面是VB.Net中嵌套If语句的基本语法：

If condition1 Then
   ' code block executed if condition1 is true
   
   If condition2 Then
      ' code block executed if both condition1 and condition2 are true
   Else
      ' code block executed if condition1 is true and condition2 is false
   End If
   
Else
   ' code block executed if condition1 is false
End If

以下是一个示例，演示了如何使用嵌套If语句来检查两个条件：

Dim num1 As Integer = 10
Dim num2 As Integer = 5

If num1 > num2 Then
   Console.WriteLine("num1 is greater than num2.")
   
   If num1 > 0 Then
      Console.WriteLine("num1 is positive.")
   Else
      Console.WriteLine("num1 is negative.")
   End If
   
Else
   Console.WriteLine("num1 is not greater than num2.")
End If

在上面的示例中，首先检查了num1是否大于num2。如果是，则输出"num1 is greater than num2.“，同时检查num1是否大于0。如果num1大于0，则输出"num1 is positive.”；否则输出"num1 is negative.“。如果num1不大于num2，则输出"num1 is not greater than num2.”。

注意：在嵌套If语句中可以使用任意数量的If语句，只要满足编程需求。