ObjectHelper.cs
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using AutoMapper;
using System;
using System.Collections.Generic;
using System.Linq.Expressions;
using System.Text;
namespace HHECS.Infrastructure.CommonHelper
{
public static class ObjectHelper
{
/// <summary>
/// 对象克隆，反射
/// </summary>
/// <typeparam name="TIn"></typeparam>
/// <typeparam name="TOut"></typeparam>
/// <param name="tIn"></param>
/// <returns></returns>
public static TOut TransReflection<TIn, TOut>(TIn tIn)
{
TOut tOut = Activator.CreateInstance<TOut>();
var tInType = tIn.GetType();
foreach (var itemOut in tOut.GetType().GetProperties())
{
var itemIn = tInType.GetProperty(itemOut.Name); ;
if (itemIn != null)
{
try
{
itemOut.SetValue(tOut, itemIn.GetValue(tIn));
}
catch (Exception)
{
}
}
}
return tOut;
}
#region MapTo
/// <summary>
/// 类型映射,默认字段名字一一对应
/// </summary>
/// <typeparam name="TDestination">转化之后的model，可以理解为viewmodel</typeparam>
/// <typeparam name="TSource">要被转化的实体，Entity</typeparam>
/// <param name="source">可以使用这个扩展方法的类型，任何引用类型</param>
/// <returns>转化之后的实体</returns>
public static TDestination MapTo<TSource, TDestination>(this TSource source) where TDestination : class where TSource : class
{
if (source == null) return default;
var config = new MapperConfiguration(cfg => cfg.CreateMap<TSource, TDestination>());
var mapper = config.CreateMapper();
return mapper.Map<TDestination>(source);
}
/// <summary>
/// 快速将当前对象的属性赋值给已存在的相同类型对象
/// </summary>
/// <typeparam name="TSource"></typeparam>
/// <typeparam name="TDestination"></typeparam>
/// <param name="source"></param>
/// <param name="destination"></param>
/// <returns></returns>
public static TDestination MapTo<TSource, TDestination>(this TSource source, TDestination destination) where TDestination : class where TSource : class
{
if (source == null) return default;
var config = new MapperConfiguration(cfg => cfg.CreateMap<TSource, TDestination>());
var mapper = config.CreateMapper();
return mapper.Map(source, destination);
}
/// <summary>
/// 集合快速复制
/// </summary>
/// <typeparam name="TSource"></typeparam>
/// <typeparam name="TDestination"></typeparam>
/// <param name="source"></param>
/// <returns></returns>
public static IEnumerable<TDestination> MapListTo<TSource, TDestination>(this IEnumerable<TSource> source)
{
if (source == null) return default;
var config = new MapperConfiguration(cfg => cfg.CreateMap<TSource, TDestination>());
var mapper = config.CreateMapper();
return mapper.Map<IEnumerable<TSource>, IEnumerable<TDestination>>(source);
}
#endregion
}
/// <summary>
/// 对象克隆
/// </summary>
/// <typeparam name="TIn"></typeparam>
/// <typeparam name="TOut"></typeparam>
public static class TransExpObject<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);
}
}
}