C# Type.GetEnumName()用法及代码示例

Type.GetEnumName(Object)方法用于返回具有当前枚举类型的指定值的常量的名称。

用法:

public virtual string GetEnumName (object value);

在这里，它使用要检索其名称的值。

返回值：此方法返回具有指定值的当前枚举类型的成员的名称。如果找不到这样的常量，则它将返回null。

异常：

ArgumentException：如果当前类型不是枚举，或者值既不是当前类型，也不具有与当前类型相同的基础类型。
ArgumentNullException：如果value为null。

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.GetEnumName(Object) Method 
using System; 
using System.Globalization; 
using System.Reflection; 
  
class GFG { 
  
    // Defining enum ABC 
    enum ABC {A, B, C} 
  
    // Main Method 
    public static void Main() 
    { 
  
        // Creating 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(); 
  
            string obj = type.GetEnumName(a); 
  
            Console.WriteLine("Name of constant is: " + obj); 
        } 
  
        // catch ArgumentNullException here 
        catch (ArgumentNullException e) 
        { 
            Console.Write("Exception Thrown: "); 
            Console.Write("{0}", e.GetType(), e.Message); 
        } 
    } 
}

输出：

Name of constant is: A

示例2:对于ArgumentException

// C# program to demonstrate the 
// Type.GetEnumName(Object) Method 
using System; 
using System.Globalization; 
using System.Reflection; 
  
class GFG { 
  
    // Defining enum ABC 
    enum ABC {A, B, C} 
  
    // Main Method 
    public static void Main() 
    { 
  
        // Creating 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 = typeof(int); 
  
            string obj = type.GetEnumName(a); 
  
            Console.WriteLine("Name of constant is: " + obj); 
        } 
  
        // catch ArgumentNullException here 
        catch (ArgumentNullException e)  
        { 
            Console.WriteLine("value is null. "); 
            Console.Write("Exception Thrown: "); 
            Console.Write("{0}", e.GetType(), e.Message); 
        } 
  
        // 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

示例3:对于ArgumentNullException

// C# program to demonstrate the 
// Type.GetEnumName(Object) Method 
using System; 
using System.Globalization; 
using System.Reflection; 
  
class GFG { 
  
   // Defining enum ABC 
    enum ABC {A, B, C} 
  
    // Main Method 
    public static void Main() 
    { 
  
        // Creating 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 = typeof(int); 
  
            string obj = type.GetEnumName(null); 
  
            Console.WriteLine("Name of constant is " + obj); 
        } 
  
        // catch ArgumentNullException here 
        catch (ArgumentNullException e)  
        { 
            Console.WriteLine("value is null. "); 
            Console.Write("Exception Thrown: "); 
            Console.Write("{0}", e.GetType(), e.Message); 
        } 
  
        // 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：

value is null. 
Exception Thrown: System.ArgumentNullException

参考：

https://docs.microsoft.com/en-us/dotnet/api/system.type.getenumname?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.GetEnumName() 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。