Dictionary<int, string> mydic = new Dictionary<int, string>();
 
foreach (EnumName foo in Enum.GetValues(typeof(EnumName)))
{
    mydic.Add((int)foo, foo.ToString());
}

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

/// <summary>
/// 枚举转字典集合
/// </summary>
/// <typeparam name="T">枚举类名称</typeparam>
/// <param name="keyDefault">默认key值</param>
/// <param name="valueDefault">默认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)) //判断是否添加默认选项
    {
        dicEnum.Add(keyDefault, valueDefault);
    }
    string[] fieldstrs = Enum.GetNames(enumType); //获取枚举字段数组
    foreach (var item in fieldstrs)
    {
        string description = string.Empty;
        var field = enumType.GetField(item);
        object[] arr = field.GetCustomAttributes(typeof(DescriptionAttribute), true); //获取属性字段数组
        if (arr != null && arr.Length > 0)
        {
            description = ((DescriptionAttribute)arr[0]).Description;   //属性描述
        }
        else
        {
            description = item;  //描述不存在取字段名称
        }
        dicEnum.Add(description, (int)Enum.Parse(enumType, item));  //不用枚举的value值作为字典key值的原因从枚举例子能看出来，其实这边应该判断他的值不存在，默认取字段名称
    }
    return dicEnum;
}