C# 对象映射

1.之前在使用AutoMapper 框架感觉用着比较不够灵活，而且主要通过表达式树Api 实现对象映射 ，写着比较讨厌，当出现复杂类型和嵌套类型时性能直线下降，甚至不如序列化快。

2.针对AutoMapper 处理复杂类型和嵌套类型时性能非常差的情况，自己实现一个简化版对象映射的高性能方案

 public class Article
    {
        public int Id { get; set; }
        public string CategoryId { get; set; }
        public string Title { get; set; }
        public string Pic { get; set; }
        public string Host { get; set; }
        public string PicHost => Pic.FormatHostUrl(Host);
        public string Content { get; set; }
        public bool TopStatus { get; set; }
        public DateTime PublishDate { get; set; }
        public string LastUpdateUser { get; set; }
        public DateTime LastUpdateDate { get; set; }
        public bool IsTeacher { get; set; }
        public bool IsParent { get; set; }
        public bool IsOrg { get; set; }
        public bool IsLeaner { get; set; }
        public string ToUserStr
        {
            get
            {
                List<string> strArr = new List<string>();
                if (IsLeaner)
                {
                    strArr.Add("学员");
                }
                if (IsOrg)
                {
                    strArr.Add("机构");
                }
                if (IsParent)
                {
                    strArr.Add("家长");
                }
                if (IsTeacher)
                {
                    strArr.Add("老师");
                }
                return string.Join(",", strArr);
            }
        }
        public int OrgId { get; set; }
        public object OrgInfo { get; set; }
        public string IsPlatformStr => OrgId == 0 ? "平台" : "机构";
    }

现在我们来使用两行代码来搞定对象映射问题

为了实现操作更方便，多对象映射

实现对象映射功能的代码如下：

  public static T CopyObjValue<T>(this T toobj, Object fromobj) where T : class
        {
            if (fromobj != null && toobj != null)
            {
                var otherobjPorps = fromobj.GetType().GetProperties();
                foreach (var formp in otherobjPorps)
                {
                    var top = toobj.GetType().GetProperty(formp.Name);
                    if (top != null)
                    {
                        try
                        {
                            top.SetValue(toobj, formp.GetValue(fromobj));
                        }
                        catch (Exception e)
                        {
                            Console.WriteLine(e.Message);
                        }
                    }
                }
            }
            return toobj;
        }