jt
2021-06-10 5d0d028456874576560552f5a5c4e8b801786f11
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/********************************************************************************
 
** auth: DBS
 
** date: 2019/3/21 11:49:05
 
** desc: 尚未编写描述
 
** Ver.:  V1.0.0
 
*********************************************************************************/
using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Text;
using System.Threading.Tasks;
 
namespace HH.WMS.Common
{
    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;
 
                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);
        }
    }
}