在.NET Core中获取枚举值中文描述的方法详解

public enum UserStatus
{
    [Description("未激活")]
    Inactive = 0,
    
    [Description("已激活")]
    Active = 1,
    
    [Description("已禁用")]
    Disabled = 2,
    
    [Description("待审核")]
    Pending = 3
}

using System;

/// <summary>
/// 枚举描述特性
/// </summary>
public class DescriptionAttribute : Attribute
{
    public string Description { get; }

    public DescriptionAttribute(string description)
    {
        Description = description;
    }
}

public enum UserStatus
{
    [Description("未激活")]
    Inactive = 0,
    
    [Description("已激活")]
    Active = 1,
    
    [Description("已禁用")]
    Disabled = 2,
    
    [Description("待审核")]
    Pending = 3
}

using System;
using System.ComponentModel;
using System.Reflection;

public static class EnumExtensions
{
    /// <summary>
    /// 获取枚举值的描述
    /// </summary>
    /// <param name="value">枚举值</param>
    /// <returns>描述信息</returns>
    public static string GetDescription(this Enum value)
    {
        if (value == null)
            return string.Empty;

        var field = value.GetType().GetField(value.ToString());
        if (field == null)
            return value.ToString();

        // 尝试获取DescriptionAttribute
        var attribute = field.GetCustomAttribute<DescriptionAttribute>();
        if (attribute != null)
            return attribute.Description;

        // 如果没有DescriptionAttribute，返回枚举名称
        return value.ToString();
    }

    /// <summary>
    /// 获取枚举类型的所有值和描述
    /// </summary>
    /// <typeparam name="T">枚举类型</typeparam>
    /// <returns>值和描述的字典</returns>
    public static Dictionary<int, string> GetEnumDescriptions<T>() where T : Enum
    {
        var result = new Dictionary<int, string>();
        var values = Enum.GetValues(typeof(T));

        foreach (T value in values)
        {
            result.Add(Convert.ToInt32(value), value.GetDescription());
        }

        return result;
    }

     /// <summary>
     /// 获取枚举类型的所有值和描述
     /// </summary>
     /// <typeparam name="T">枚举类型</typeparam>
     /// <returns>值和描述的字典</returns>
     public static Dictionary<T, string> GetEnumDescriptionsDict<T>() where T : Enum
     {
         return Enum.GetValues(typeof(T))
                    .Cast<T>()
                    .ToDictionary(e => e, e => e.GetDescription());
     }
}

Console.WriteLine("Hello, World!");

// 示例1：获取单个枚举值的描述
UserStatus status = UserStatus.Active;
string description = status.GetDescription();
Console.WriteLine($"状态描述: {description}"); // 输出: 状态描述: 已激活

// 示例2：遍历所有枚举值
foreach (UserStatus value in Enum.GetValues(typeof(UserStatus)))
{
    Console.WriteLine($"{value}: {value.GetDescription()}");
}

// 示例3：获取所有枚举值的字典
var statusDict = EnumExtensions.GetEnumDescriptions<UserStatus>();
foreach (var item in statusDict)
{
    Console.WriteLine($"值: {item.Key}, 描述: {item.Value}");
}
Console.ReadKey();

using System.ComponentModel;

public enum UserStatus
{
    [Description("未激活")]
    Inactive = 0,
    
    [Description("已激活")]
    Active = 1
}

// 修改扩展方法中的引用
public static class EnumExtensions
{
    public static string GetDescription(this Enum value)
    {
        if (value == null)
            return string.Empty;

        var field = value.GetType().GetField(value.ToString());
        if (field == null)
            return value.ToString();

        // 使用System.ComponentModel.DescriptionAttribute
        var attribute = field.GetCustomAttribute<DescriptionAttribute>();
        if (attribute != null)
            return attribute.Description;

        return value.ToString();
    }
}