实体类与实体DTO类之间的转换

<div id="content_views" class="markdown_views">  <svg xmlns="http://www.w3.org/2000/svg" style="display: none;"> <path stroke-linecap="round" d="M5,0 0,2.5 5,5z" id="raphael-marker-block" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0);"></path> </svg> <h2 id="实体类与实体dto类之间的转换"><a name="t0"></a>实体类与实体DTO类之间的转换</h2>前端

<div class="toc"><div class="toc"> <ul> <li><ul> <li><a href="#实体类与实体dto类之间的转换" rel="nofollow" target="_self">实体类与实体DTO类之间的转换</a><ul> <li><a href="#1经过使用第三方序列化反序列化工具newtonsoftjson" rel="nofollow" target="_self">1.经过使用第三方序列化反序列化工具Newtonsoft.Json</a></li> <li><a href="#2经过反射实现" rel="nofollow" target="_self">2.经过反射实现</a></li> <li><a href="#3经过表达式目录树加字典缓存实现" rel="nofollow" target="_self">3.经过表达式目录树加字典缓存实现</a></li> <li><a href="#4-经过表达式目录树加泛型缓存实现静态构造函数" rel="nofollow" target="_self">4. 经过表达式目录树加泛型缓存实现(静态构造函数)</a></li> </ul> </li> </ul> </li> </ul> </div> </div> web

<h3 id="1经过使用第三方序列化反序列化工具newtonsoftjson"><a name="t1"></a>1.经过使用第三方序列化反序列化工具Newtonsoft.Json</h3>json

经过Nuget包管理器添加Newtonsoft.Json <img src="https://img-blog.csdn.net/20180520214411143?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzM3NTkxNjcx/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70" alt="这里写图片描述" title=""> 构造一个Trans的静态方法：缓存

<pre class="prettyprint" name="code"><code class="hljs cs has-numbering" onclick="mdcp.signin(event)">public static TOut Trans<TIn,TOut>(TIn tIn) { return JsonConvert.DeserializeObject<TOut>(JsonConvert.SerializeObject(tIn)); } <div class="hljs-button signin" data-title="登陆后复制"></div></code></pre>markdown

前端调用：app

<pre class="prettyprint" name="code"><code class="hljs vbscript has-numbering" onclick="mdcp.signin(event)">People people = new People { Id = 1, Name = "ddd", Class = 1 }; PeopleCopy peopleCopy = SerializeMapper.Trans<People, PeopleCopy>(people); <div class="hljs-button signin" data-title="登陆后复制"></div></code></pre>svg

<h3 id="2经过反射实现"><a name="t2"></a>2.经过反射实现</h3>函数

构造一个Trans的静态方法：工具

前端调用：

<pre class="prettyprint" name="code"><code class="hljs vbscript has-numbering" onclick="mdcp.signin(event)">People people = new People { Id = 1, Name = "ddd", Class = 1 }; PeopleCopy peopleCopy = ReflectionMapper.Trans<People, PeopleCopy>(people); <div class="hljs-button signin" data-title="登陆后复制"></div></code></pre>

<h3 id="3经过表达式目录树加字典缓存实现"><a name="t3"></a>3.经过表达式目录树加字典缓存实现</h3>

静态字典：

<pre class="prettyprint" name="code"><code class="hljs cs has-numbering" onclick="mdcp.signin(event)">public static Dictionary<string, Object> _Dictionary = new Dictionary<string, object>();<div class="hljs-button signin" data-title="登陆后复制"></div></code></pre>

构造一个Trans的静态方法：

<pre class="prettyprint" name="code"><code class="hljs avrasm has-numbering" onclick="mdcp.signin(event)">public static TOut Trans<TIn, TOut>(TIn tIn) { TOut tOut = Activator.CreateInstance<TOut>(); string key = string.Format("funckey_{0}_{1}", tIn.GetType().Name, tOut.GetType().Name); if (!_Dictionary.ContainsKey(key)) { ParameterExpression parameterExpression = Expression.Parameter(typeof(TIn), "p"); List<MemberBinding> memberBindingsList = new List<MemberBinding>(); foreach (var item in typeof(TOut).GetProperties()) { MemberExpression property = Expression.Property(parameterExpression, typeof(TIn).GetProperty(item.Name)); MemberBinding memberBinding = Expression.Bind(item, property); memberBindingsList.Add(memberBinding); } foreach (var item in typeof(TOut).GetFields()) { MemberExpression filed = Expression.Field(parameterExpression, typeof(TIn).GetField(item.Name)); MemberBinding memberBinding = Expression.Bind(item, filed); memberBindingsList.Add(memberBinding); } MemberInitExpression memberInitExpression = Expression.MemberInit(Expression.New(typeof(TOut)), memberBindingsList.ToArray()); Expression<Func<TIn, TOut>> lambda = Expression.Lambda<Func<TIn, TOut>>(memberInitExpression, new ParameterExpression[] { parameterExpression }); Func<TIn, TOut> func = lambda.Compile(); _Dictionary[key] = func; } return ((Func<TIn, TOut>)_Dictionary[key]).Invoke(tIn); } <div class="hljs-button signin" data-title="登陆后复制"></div></code></pre>

前端调用：

<pre class="prettyprint" name="code"><code class="hljs vbscript has-numbering" onclick="mdcp.signin(event)">People people = new People { Id = 1, Name = "ddd", Class = 1 }; PeopleCopy peopleCopy = ExpressionMapper.Trans<People, PeopleCopy>(people); <div class="hljs-button signin" data-title="登陆后复制"></div></code></pre>

<h3 id="4-经过表达式目录树加泛型缓存实现静态构造函数"><a name="t4"></a>4. 经过表达式目录树加泛型缓存实现(静态构造函数)</h3>

构造一个泛型缓存类：

<pre class="prettyprint" name="code"><code class="hljs cs has-numbering" onclick="mdcp.signin(event)"> public class ExpressionGenericMapper<TIn,TOut> { private static Func<TIn, TOut> _FUNC = null; static ExpressionGenericMapper() { ParameterExpression parameterExpression = Expression.Parameter(typeof(TIn),"p"); List<MemberBinding> memberBindingsList = new List<MemberBinding>(); foreach (var item in typeof(TOut).GetProperties()) { MemberExpression property = Expression.Property(parameterExpression, typeof(TIn).GetProperty(item.Name)); MemberBinding memberBinding = Expression.Bind(item, property); memberBindingsList.Add(memberBinding); } foreach (var item in typeof(TOut).GetFields()) { MemberExpression property = Expression.Field(parameterExpression, typeof(TIn).GetField(item.Name)); MemberBinding memberBinding = Expression.Bind(item, property); memberBindingsList.Add(memberBinding); } MemberInitExpression memberInitExpression = Expression.MemberInit(Expression.New(typeof(TOut)), memberBindingsList.ToArray()); Expression<Func<TIn, TOut>> lambda = Expression.Lambda<Func<TIn, TOut>>(memberInitExpression, new ParameterExpression[] { parameterExpression }); _FUNC = lambda.Compile();//拼装是一次性的 } public static TOut Trans(TIn tIn) { return _FUNC(tIn); } } <div class="hljs-button signin" data-title="登陆后复制"></div></code></pre>

前端调用：

<pre class="prettyprint" name="code"><code class="hljs vbscript has-numbering" onclick="mdcp.signin(event)">People people = new People { Id = 1, Name = "ddd", Class = 1 }; PeopleCopy peopleCopy = ExpressionGenericMapper.Trans<People, PeopleCopy>(people);<div class="hljs-button signin" data-title="登陆后复制"></div></code></pre> </div>

原文地址：https://blog.csdn.net/m0_37591671/article/details/80386122