方法1

Dictionary<int, string> mydic = new Dictionary<int, string>();

foreach (EnumName foo in Enum.GetValues(typeof(EnumName)))
{
    mydic.Add((int)foo, foo.ToString());
}

方法2

var dict = Enum.GetValues(typeof(EnumName))
               .Cast<EnumName>()
               .ToDictionary
 
(t => (int)t, t => t.ToString());

方法3

/// <summary>
/// 列舉轉字典集合(Key是value,Value是description（如果不存在description 則是name）)
/// </summary>
/// <typeparam name="T">列舉類名稱</typeparam>
/// <param name="keyDefault">預設key值</param>
/// <param name="valueDefault">預設value值</param>
 

/// <returns>返回生成的字典集合</returns>
public static Dictionary<string, object> EnumListDic<T>(string keyDefault, string valueDefault = "")
{
    Dictionary<string, object> dicEnum = new Dictionary<string, object>();
    Type enumType = typeof(T);
    if (!enumType.IsEnum)
    {
        return
 
 dicEnum;
    }
    if (!string.IsNullOrEmpty(keyDefault)) //判斷是否新增預設選項
    {
        dicEnum.Add(keyDefault, valueDefault);
    }
    string[] fieldstrs = Enum.GetNames(enumType); //獲取列舉欄位陣列
    foreach (var item in fieldstrs)
    {
        string description = string.Empty;
        var field = enumType.GetField(item);
        object[] arr = field.GetCustomAttributes(typeof(DescriptionAttribute), true); //獲取屬性欄位陣列
        if (arr != null && arr.Length > 0)
        {
            description = ((DescriptionAttribute)arr[0]).Description;   //屬性描述
        }
        else
        {
            description = item;  //描述不存在取欄位名稱
        }
        dicEnum.Add(description, (int)Enum.Parse(enumType, item));  //不用列舉的value值作為字典key值的原因從列舉例子能看出來，其實這邊應該判斷他的值不存在，預設取欄位名稱
    }
    return dicEnum;
}