C# Type.GetEnumName()用法及代碼示例

Type.GetEnumName(Object)方法用於返回具有當前枚舉類型的指定值的常量的名稱。

用法:

public virtual string GetEnumName (object value);

在這裏，它使用要檢索其名稱的值。

返回值：此方法返回具有指定值的當前枚舉類型的成員的名稱。如果找不到這樣的常量，則它將返回null。

異常：

ArgumentException：如果當前類型不是枚舉，或者值既不是當前類型，也不具有與當前類型相同的基礎類型。
ArgumentNullException：如果value為null。

以下示例程序旨在說明上述方法的用法：

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); 
        } 
    } 
}

輸出：

Name of constant is: A

示例2:對於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); 
        } 
    } 
}

輸出：

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

示例3:對於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); 
        } 
    } 
}

輸出：

value is null. 
Exception Thrown: System.ArgumentNullException

參考：

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

相關用法

注：本文由純淨天空篩選整理自RohitPrasad3大神的英文原創作品 C# | Type.GetEnumName() Method。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。