VB.NET Enum.IsDefined方法代码示例

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本文整理汇总了VB.NET中System.Enum.IsDefined方法的典型用法代码示例。如果您正苦于以下问题：VB.NET Enum.IsDefined方法的具体用法？VB.NET Enum.IsDefined怎么用？VB.NET Enum.IsDefined使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类System.Enum的用法示例。

在下文中一共展示了Enum.IsDefined方法的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于我们的系统推荐出更棒的VB.NET代码示例。

示例1: Example

<Flags> Public Enum PetType As Integer
   None = 0
   Dog = 1
   Cat = 2
   Rodent = 4
   Bird = 8
   Reptile = 16
   Other = 32
End Enum

Module Example
   Public Sub Main()
      Dim value As Object
      
      ' Call IsDefined with underlying integral value of member.
      value = 1
      Console.WriteLine("{0}: {1}", value, [Enum].IsDefined(GetType(PetType), value))
      ' Call IsDefined with invalid underlying integral value.
      value = 64
      Console.WriteLine("{0}: {1}", value, [Enum].IsDefined(GetType(PetType), value))
      ' Call IsDefined with string containing member name.
      value = "Rodent"
      Console.WriteLine("{0}: {1}", value, [Enum].IsDefined(GetType(PetType), value))
      ' Call IsDefined with a variable of type PetType.
      value = PetType.Dog
      Console.WriteLine("{0}: {1}", value, [Enum].IsDefined(GetType(PetType), value))
      value = PetType.Dog Or PetType.Cat
      Console.WriteLine("{0}: {1}", value, [Enum].IsDefined(GetType(PetType), value))
      ' Call IsDefined with uppercase member name.      
      value = "None"
      Console.WriteLine("{0}: {1}", value, [Enum].IsDefined(GetType(PetType), value))
      value = "NONE"
      Console.WriteLine("{0}: {1}", value, [Enum].IsDefined(GetType(PetType), value))
      ' Call IsDefined with combined value
      value = PetType.Dog Or PetType.Bird
      Console.WriteLine("{0:D}: {1}", value, [Enum].IsDefined(GetType(PetType), value))
      value = value.ToString()
      Console.WriteLine("{0:D}: {1}", value, [Enum].IsDefined(GetType(PetType), value))
   End Sub
End Module

开发者ID:VB.NET开发者，项目名称:System，代码行数:40，代码来源:Enum.IsDefined

输出：

1: True
64: False 
Rodent: True
Dog: True
Dog, Cat: False
None: True
NONE: False
9: False
Dog, Bird: False

示例2: Example

<Flags> Public Enum Pets As Integer
   None = 0
   Dog = 1
   Cat = 2
   Bird = 4
   Rodent = 8
   Other = 16
End Enum

Module Example
   Public Sub Main()
      Dim value As Pets = Pets.Dog Or Pets.Cat
      Console.WriteLine("{0:D} Exists: {1}", 
                        value, Pets.IsDefined(GetType(Pets), value))
      Dim name As String = value.ToString()
      Console.WriteLine("{0} Exists: {1}", 
                        name, Pets.IsDefined(GetType(Pets), name))
   End Sub
End Module

开发者ID:VB.NET开发者，项目名称:System，代码行数:19，代码来源:Enum.IsDefined

输出：