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56 lines
2.8 KiB
56 lines
2.8 KiB
3 months ago
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//------------------------------------------------------------------------------
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// 此代码版权（除特别声明或在XREF结尾的命名空间的代码）归作者本人若汝棋茗所有
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// 源代码使用协议遵循本仓库的开源协议及附加协议，若本仓库没有设置，则按MIT开源协议授权
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// CSDN博客：https://blog.csdn.net/qq_40374647
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// 哔哩哔哩视频：https://space.bilibili.com/94253567
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// Gitee源代码仓库：https://gitee.com/RRQM_Home
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// Github源代码仓库：https://github.com/RRQM
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// API首页：https://www.yuque.com/rrqm/touchsocket/index
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// 交流QQ群：234762506
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// 感谢您的下载和使用
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//------------------------------------------------------------------------------
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//------------------------------------------------------------------------------
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using System;
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using System.Collections.Generic;
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using System.Linq.Expressions;
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namespace TouchSocket.Core
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{
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/// <summary>
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/// 表达式复制
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/// </summary>
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public class ExpressionMapper
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{
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private static readonly Dictionary<string, object> m_dic = new Dictionary<string, object>();
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/// <summary>
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/// 字典缓存表达式树
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/// </summary>
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public static TOut Trans<TIn, TOut>(TIn tIn)
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{
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string key = string.Format("funckey_{0}_{1}", typeof(TIn).FullName, typeof(TOut).FullName);
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if (!m_dic.ContainsKey(key))
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{
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ParameterExpression parameterExpression = Expression.Parameter(typeof(TIn), "p");
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List<MemberBinding> memberBindingList = new List<MemberBinding>();
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foreach (var item in typeof(TOut).GetProperties())
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{
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MemberExpression property = Expression.Property(parameterExpression, typeof(TIn).GetProperty(item.Name));
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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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foreach (var item in typeof(TOut).GetFields())
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{
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MemberExpression property = Expression.Field(parameterExpression, typeof(TIn).GetField(item.Name));
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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(TOut)), memberBindingList.ToArray());
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Expression<Func<TIn, TOut>> lambda = Expression.Lambda<Func<TIn, TOut>>(memberInitExpression, parameterExpression);
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Func<TIn, TOut> func = lambda.Compile();//拼装是一次性的
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m_dic[key] = func;
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}
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return ((Func<TIn, TOut>)m_dic[key]).Invoke(tIn);
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}
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}
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}
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