1.传统方式进行对象赋值 2.反射或序列化动态赋值 3.通过表达式结合缓存赋值合适大量的数据复制
具体实现代码
/// <summary> /// 复制对象(反射) /// </summary> /// <typeparam name="TIn">复制需要的对象</typeparam> /// <typeparam name="TOut">输出对象</typeparam> /// <param name="tIn"></param> /// <returns></returns> private static TOut TransReflection<TIn, TOut>(TIn tIn) { TOut tOut = Activator.CreateInstance<TOut>(); foreach (var itemOut in tOut.GetType().GetProperties()) { var itemIn = tIn.GetType().GetProperties().Where(i => i.Name == itemOut.Name).FirstOrDefault(); if (itemIn != null) { itemOut.SetValue(tOut, itemIn.GetValue(tIn)); Console.WriteLine(itemIn.GetValue(tIn)); } } return tOut; } /// <summary> /// 表达式树 复制对象通用代码 /// </summary> /// <typeparam name="TIn">复制需要的对象</typeparam> /// <typeparam name="TOut">输出对象</typeparam> /// <param name="tIn"></param> /// <returns></returns> private static TOut TransExp<TIn, TOut>(TIn tIn) { string key = string.Format("trans_exp_{0}_{1}", typeof(TIn).FullName, typeof(TOut).FullName); if (!_Dic.ContainsKey(key)) { ParameterExpression parameterExpression = Expression.Parameter(typeof(TIn), "p"); List<MemberBinding> memberBindingList = new List<MemberBinding>(); foreach (var item in typeof(TOut).GetProperties()) { MemberExpression property = Expression.Property(parameterExpression, typeof(TIn).GetProperty(item.Name)); MemberBinding memberBinding = Expression.Bind(item, property); memberBindingList.Add(memberBinding); } MemberInitExpression memberInitExpression = Expression.MemberInit(Expression.New(typeof(TOut)), memberBindingList.ToArray()); Expression<Func<TIn, TOut>> lambda = Expression.Lambda<Func<TIn, TOut>>(memberInitExpression, new ParameterExpression[] { parameterExpression }); Func<TIn, TOut> func = lambda.Compile(); _Dic[key] = func; } return ((Func<TIn, TOut>)_Dic[key])(tIn); }
原文:http://www.cnblogs.com/emrys5/p/expression_trans_model.html