77 lines
3.0 KiB
C#
77 lines
3.0 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Linq.Expressions;
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using System.Reflection;
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using System.Text;
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using System.Threading.Tasks;
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namespace Tnb.Common.Utils
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{
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public class DeepCopyHelper<T> where T : class, new() // 需要无参构造函数，构造表达式树的时候需要利用无参构造函数创建对象
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{
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/// <summary>
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/// 映射表达式，泛型缓存每个类型存一份
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/// </summary>
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private static readonly Func<T, T> s_CopyFunc = null;
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/// <summary>
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/// 静态构造函数，每个泛型类型会且只会执行一次
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/// </summary>
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static DeepCopyHelper()
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{
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BindingFlags bindingFlags = BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic;
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ParameterExpression parameterExpression = Expression.Parameter(typeof(T), "m"); // 参数m :m =>
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List<MemberBinding> memberBindingList = new List<MemberBinding>();
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foreach (var item in typeof(T).GetProperties(bindingFlags))
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{
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if (!item.CanWrite) // 只读属性不拷贝
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{
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continue;
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}
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MemberExpression property = Expression.Property(parameterExpression, item); // m.Name
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MemberBinding memberBinding = Expression.Bind(item, property); // Name = m.Name
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memberBindingList.Add(memberBinding);
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}
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foreach (var item in typeof(T).GetFields(bindingFlags))
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{
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MemberExpression property = Expression.Field(parameterExpression, item);
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MemberBinding memberBinding = Expression.Bind(item, property);
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memberBindingList.Add(memberBinding);
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}
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MemberInitExpression memberInitExpression = Expression.MemberInit(Expression.New(typeof(T)), memberBindingList.ToArray());// new T() {Name = m.Name}
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Expression<Func<T, T>> lambda = Expression.Lambda<Func<T, T>>(memberInitExpression, new ParameterExpression[]
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{
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parameterExpression
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}); // m => new T() {Name = m.Name}
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s_CopyFunc = lambda.Compile();
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}
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/// <summary>
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/// 对象拷贝（拷贝private/public：实例成员、属性、静态成员）
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/// </summary>
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/// <param name="data">源</param>
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/// <returns></returns>
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public static T DeepCopy(T data)
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{
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return s_CopyFunc(data);
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}
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/// <summary>
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/// 集合拷贝（拷贝private/public：实例成员、属性、静态成员）
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/// </summary>
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/// <param name="data">源</param>
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/// <returns></returns>
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public static List<T> DeepCopyList(List<T> data)
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{
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if (data == null || data.Count < 1)
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{
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return Enumerable.Empty<T>().ToList();
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}
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return data.Select(a => DeepCopy(a)).ToList();
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}
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}
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}
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