C# 对象快速复制

    public static class TransExpV2<TIn, TOut>
    {
        private static readonly Func<TIn, TOut> cache = GetFunc();
        private static Func<TIn, TOut> GetFunc()
        {
            ParameterExpression parameterExpression = Expression.Parameter(typeof(TIn), "p");
            List<MemberBinding> memberBindingList = new List<MemberBinding>();
            foreach (var item in typeof(TOut).GetProperties())
            {
                if (!item.CanWrite) continue;
                if (typeof(TIn).GetProperty(item.Name) == null) continue;
                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 });
            return lambda.Compile();
        }

        public static TOut Trans(TIn tIn)
        {
            return cache(tIn);
        }
    }

　　看到一个好的方法保存下来以备用，原文地址：https://www.cnblogs.com/emrys5/p/expression_trans_model.html