src/DotNetCommon.Core/MapperHelper.cs

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using DotNetCommon.Extensions;
using System;
using System.Collections;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;
using System.Linq;
using System.Linq.Expressions;
using System.Reflection;
using System.Text;
using System.Text.Json;
using static System.Net.Mime.MediaTypeNames;

namespace DotNetCommon
{
    /// <summary>
    /// Mapper帮助类，参照: <seealso cref="MapperHelper.Mapper(Type, Type, object, bool, bool)"/>
    /// </summary>
    public class MapperHelper
    {
        /// <summary>
        /// Mapper时用的缓存字典,内部封装了 ConcurrentDictionary&lt;object, object>，由 containsRepeatReference 决定是否使用内部的字典
        /// </summary>
        public class CacheDictionary
        {
            private readonly ConcurrentDictionary<(Type from, Type dest, object obj), object> dic;
            private readonly bool containsRepeatReference = true;
            public CacheDictionary(bool containsRepeatReference, int capacity = 1024)
            {
                this.containsRepeatReference = containsRepeatReference;
                if (containsRepeatReference) dic = new ConcurrentDictionary<(Type from, Type dest, object obj), object>(1, capacity);
            }

            public bool ContainsKey((Type from, Type dest, object obj) key)
            {
                if (!containsRepeatReference) return false;
                return dic.ContainsKey(key);
            }

            public void Add((Type from, Type dest, object obj) key, object value)
            {
                if (!containsRepeatReference) return;
                dic.TryAdd(key, value);
            }

            public object get_Item((Type from, Type dest, object obj) obj)
            {
                if (!containsRepeatReference) return null;
                return dic.ContainsKey(obj) ? dic[obj] : null;
            }

            public void set_Item((Type from, Type dest, object obj) key, object val)
            {
                if (!containsRepeatReference) return;
                dic.TryAdd(key, val);
            }
        }
        class Wrapper
        {