实体copy

using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Text;

namespace U1City.Infrastructure
{
    public class EntityExtension
    {
        public static T EntityToEntityByField<T>(object obj, T newObj) where T : class,new()
        {
            if (newObj == null)
            {
                newObj = new T();
            }
            PropertyInfo[] propertyInfos = obj.GetType().GetProperties();
            PropertyInfo[] newPropertyInfos = typeof(T).GetProperties();
            foreach (var newPropertyInfoItem in newPropertyInfos)
            {
                foreach (var propertyInfoItem in propertyInfos)
                {

                    if (
                      propertyInfoItem.PropertyType.FullName.Equals(newPropertyInfoItem.PropertyType.FullName)
                      && propertyInfoItem.Name == newPropertyInfoItem.Name
                      && propertyInfoItem.CanRead
                      && newPropertyInfoItem.CanWrite
                      )
                    {
                        newPropertyInfoItem.SetValue(newObj, propertyInfoItem.GetValue(obj, null), null);
                        break;
                    }
                    else if (
                        propertyInfoItem.Name == newPropertyInfoItem.Name
                        && !propertyInfoItem.PropertyType.FullName.Equals(newPropertyInfoItem.PropertyType.FullName))
                    {
                      //??  EntityToEntityByField(propertyInfoItem.GetValue(obj, null), newPropertyInfoItem.GetValue(newObj, null));
                    }
                }
            }
            return newObj;
        }
    }
}