C# Type.GetEnumUnderlyingType()用法及代码示例

Type.GetEnumUnderlyingType()方法用于返回当前枚举类型的基础类型。

用法:

public virtual Type GetEnumUnderlyingType ();

返回值：此方法返回当前枚举的基础类型。

异常：如果当前类型不是枚举或枚举类型无效(由于包含多个实例字段)，则此方法将返回ArgumentException。

以下示例程序旨在说明上述方法的用法：

示例1:

// C# program to demonstrate the 
// Type.GetEnumUnderlyingType() Method 
using System; 
using System.Globalization; 
using System.Reflection; 
  
class GFG { 
  
    // Defining enum ABC 
    enum ABC { A, 
               B, 
               C, 
               D, 
               E, 
               F } 
  
    // Main Method 
    public static void Main() 
    { 
  
        // try-catch block to 
        // handle exceptions 
        try { 
  
            // Creating and initializing object 
            // of ABC with instace of enum ABC 
            ABC a = ABC.A; 
  
            // Declaring and initializing 
            // object of Type 
            Type type = a.GetType(); 
  
            // Getting underlying type of current enumeration 
            // By using GetEnumUnderlyingType() method 
            Type obj = type.GetEnumUnderlyingType(); 
  
            // Display underlying type 
            Console.Write("Underlying type is : {0} ", obj); 
        } 
  
        // ArgumentException here 
        catch (ArgumentException e)  
        { 
            Console.Write("The current type is not an enumeration."); 
            Console.Write("Exception Thrown: "); 
            Console.Write("{0}", e.GetType(), e.Message); 
        } 
    } 
}

输出：

Underlying type is : System.Int32

示例2:对于ArgumentException

// C# program to demonstrate the 
// Type.GetEnumUnderlyingType() Method 
using System; 
using System.Globalization; 
using System.Reflection; 
  
class GFG { 
  
    // Defining enum ABC 
    enum ABC { A, 
               B, 
               C, 
               D, 
               E, 
               F } 
  
    // Main Method 
    public static void Main() 
    { 
  
        // try-catch block to 
        // handle exceptions 
        try { 
  
            // Declaring and initializing 
            // object of Type 
            Type type = typeof(int); 
  
            // Getting underlying type of current enumeration 
            // By using GetEnumUnderlyingType() method 
            Type obj = type.GetEnumUnderlyingType(); 
  
            // Display underlying type 
            Console.Write("underlying type is : {0} ", obj); 
        } 
  
        // catch ArgumentException here 
        catch (ArgumentException e)  
        { 
            Console.WriteLine("The current type is not an enumeration."); 
            Console.Write("Exception Thrown: "); 
            Console.Write("{0}", e.GetType(), e.Message); 
        } 
    } 
}

输出：

The current type is not an enumeration.
Exception Thrown: System.ArgumentException

参考：

https://docs.microsoft.com/en-us/dotnet/api/system.type.getenumunderlyingtype?view=netframework-4.8

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注：本文由纯净天空筛选整理自RohitPrasad3大神的英文原创作品 C# | Type.GetEnumUnderlyingType() Method。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。