C＃| Type.GetEnumName()方法

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。

句法：

public virtual string GetEnumName (object value);

在这里，它使用要检索其名称的值。

返回值：该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。

例外情况：

• 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。

下面的程序说明了上述方法的用法：

范例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/zh-cn/dotnet/api/system.type.getenumname?view=netframework-4.8