VB.Net - 其他操作符
2018-12-16 13:45 更新
有很少其他重要的操作系统支持VB.Net。
运算符 | 描述 | 示例 |
---|---|---|
AddressOf | Returns the address of a procedure. 返回过程的地址。 | AddHandler Button1.Click, AddressOf Button1_Click |
Await | It is applied to an operand in an asynchronous method or lambda expression to suspend execution of the method until the awaited task completes. 它应用于异步方法或lambda表达式中的操作数,以挂起该方法的执行,直到等待的任务完成。 | Dim result As res = Await AsyncMethodThatReturnsResult() Await AsyncMethod() |
GetType | It returns a Type object for the specified type. The Type object provides information about the type such as its properties, methods, and events. 它返回指定类型的Type对象。 Type对象提供有关类型的信息,例如其属性,方法和事件。 | MsgBox(GetType(Integer).ToString()) |
Function Expression | It declares the parameters and code that define a function lambda expression. 它声明定义函数lambda表达式的参数和代码。 | Dim add5 = Function(num As Integer) num + 5 'prints 10 Console.WriteLine(add5(5)) |
If | It uses short-circuit evaluation to conditionally return one of two values. The If operator can be called with three arguments or with two arguments. 它使用短路评估有条件地返回两个值之一。 可以使用三个参数或两个参数调用If运算符。 | Dim num = 5 Console.WriteLine(If(num >= 0, "Positive", "Negative")) |
示例:
以下示例演示了其中一些运算符:
Module assignment
Sub Main()
Dim a As Integer = 21
Console.WriteLine(GetType(Integer).ToString())
Console.WriteLine(GetType(Double).ToString())
Console.WriteLine(GetType(String).ToString())
Dim multiplywith5 = Function(num As Integer) num * 5
Console.WriteLine(multiplywith5(5))
Console.WriteLine(If(a >= 0, "Positive", "Negative"))
Console.ReadLine()
End Sub
End Module
当上述代码被编译和执行时,它产生以下结果:
System.Int32
System.Double
System.String
25
Positive
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