74 lines
2.6 KiB
C#
74 lines
2.6 KiB
C#
using System;
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using System.Linq;
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namespace WX.CRM.Common
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{
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public class Mapper
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{
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/// <summary>
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/// 通过反射，将 T1 映射为 T2
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/// </summary>
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/// <typeparam name="T1"></typeparam>
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/// <typeparam name="T2"></typeparam>
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/// <param name="t1"></param>
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/// <returns></returns>
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public static T2 T1MapToT2<T1, T2>(T1 t1)
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where T1 : class
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where T2 : class //, new()
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{
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T2 t2 = Activator.CreateInstance<T2>(); //T2 t2 = new T2(); //后面这种写法，要在 where 中添加 new()
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if (t1 == null)
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{
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return t2;
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}
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var p1 = t1.GetType().GetProperties();
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var p2 = typeof(T2).GetProperties();
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for (int i = 0; i < p1.Length; i++)
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{
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//条件：1、属性名相同；2、t2属性可写；3、属性可读性一致；4、数据类型相近（相同，或者接近。接近如：int 和 int?）
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var p = p2.Where(t => t.Name == p1[i].Name && t.CanWrite && t.CanRead == p1[i].CanRead).FirstOrDefault();
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if (p == null)
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continue;
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var v = p1[i].GetValue(t1);
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if (v == null)
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continue;
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try { p.SetValue(t2, v); } //难判定数据类型，暂时这样处理
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catch
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{
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try { p.SetValue(t2, Convert.ChangeType(v, p.PropertyType)); } //int? -> object -> int? 会抛错
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catch { }
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}
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}
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return t2;
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}
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//这种写法和上面的写法没啥差别
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public static T2 T1MapToT2_2<T1, T2>(T1 t1)
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where T1 : class
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where T2 : class //, new()
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{
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T2 t2 = Activator.CreateInstance<T2>(); //T2 t2 = new T2(); //后面这种写法，要在 where 中添加 new()
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var p1 = t1.GetType().GetProperties();
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var p2 = typeof(T2);
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for (int i = 0; i < p1.Length; i++)
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{
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//条件：1、属性名相同；2、t2属性可写；3、属性可读性一致；4、数据类型相近（相同，或者接近。接近如：int 和 int?）
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var p = p2.GetProperty(p1[i].Name);
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if (p == null || !p.CanWrite || p.CanRead != p1[i].CanRead)
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continue;
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var v = p1[i].GetValue(t1);
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if (v == null)
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continue;
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try { p.SetValue(t2, Convert.ChangeType(v, p.PropertyType)); }
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catch { }
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}
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return t2;
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}
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}
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}
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