詳解c#動態類型和動態對象的建立,合并2個對象,map執行個體代碼

下面小編就為大家帶來一篇c#動態類型,及動態對象的建立,合并2個對象,map執行個體。小編覺得挺不錯的，現在就分享給大家，也給大家做個參考。一起跟隨小編過來看看吧

經常會遇到這樣的情況，我們在響應用戶端請求的資料的時候需要對資料進行處理，比如資料庫中的資料是int型，它可能表示某個枚舉，或者其它的邏輯意義（資料庫這樣的設計可能是從資料安全性、儲存量上等角度考慮），但是用戶端顯示的時候需要是它具體的意義。

這個時候我們的處理方式一般都是2中的，如果邏輯不複雜，且單一的話，直接修改sql語句就能處理好資料來源，這個時候代碼裡面不需要處理什麼。

但是如果邏輯複稍許複雜或者判斷的情況有很多分支，我們不得不從代碼角度來處理了。單個對象還好，多個對象比如是個list<T>,那就要迴圈對某個對象的欄位進行XXX了。

進而衍生出了這就出現了DTO，Arg的中間對象，當然，我個人是很喜歡這樣的設計的，但是某些時候也會偷懶不想寫（多半情況我直接寫代碼生器批量生產），比如在測試的時候，在接私活的時候，在示範的時候，只為快速呈現想要的效果 都懶得去屑，是的，你會說市面上不是有很多的map庫，比如automap，tinymap，甚至json.net裡面的動態特性重寫，方法當然很多，但用一個大輪子來費力搞這麼個小事，我覺得划不來。且輪子越來越大它要乾的事越多，我可不想搞的那麼複雜，嗯，就是這樣，寫了個。

具體的代碼貼到下面，如果看明白，會很方便的擴充了或修改成自己想要的效果。

using System.Dynamic;using System.Reflection;using System.Collections.Concurrent;private static readonly ConcurrentDictionary<RuntimeTypeHandle, PropertyInfo[]>  DynamicObjectProperties = new ConcurrentDictionary<RuntimeTypeHandle, PropertyInfo[]>();private IDictionary<string, Object> ToDynamicResult<T>(T classobj, Func<string, object, object> injectAct)  where T : IInjectClass, new(){  var type = typeof(T);  var key = type.TypeHandle;  var dynamicResult = new ExpandoObject() as IDictionary<string, Object>;  PropertyInfo[] queryPts = null;  DynamicObjectProperties.TryGetValue(key, out queryPts);  if (queryPts == null)  {    queryPts = type.GetProperties();    DynamicObjectProperties.TryAdd(key, queryPts);  }  foreach (var p in queryPts)  {    var attributes = p.GetCustomAttributes(typeof(IngorePropertyAttribute), true);    var columnMapping = attributes.FirstOrDefault();    if (columnMapping != null) continue;    var _name = p.Name;    var _value = p.GetValue(classobj, null);    object _tempvalue = _value;    if (injectAct != null) _tempvalue = injectAct.Invoke(_name, _value);    //var value = Convert.ChangeType(value，typeof(string));     dynamicResult.Add(p.Name, _tempvalue);  }  return dynamicResult;}/// <summary>/// 支援動態輸出的對象介面/// </summary>public interface IInjectClass{}/// <summary>/// 動態輸出時忽略此標記的屬性/// </summary>public class IngorePropertyAttribute : Attribute{}

下面我們測試一個：

 public class kk : IInjectClass {  public string aa { get; set; }  public int bb { get; set; }  [IngoreProperty]  public bool cc { get; set; }  public DateTime dd { get; set; } }kk ist = new kk();ist.aa = "aaa";ist.bb = 123;ist.cc = false;ist.dd = DateTime.Now;var tt = ToDynamicResult<kk>(ist, (k, v) =>{  if (k != "aa") return v;  return v + "(改變了哦)";});var json = Tools.JsonUtils.JsonSerializer(tt);json = json + "<br /><br />" + Tools.JsonUtils.JsonSerializer(ToDynamicResult<kk>(    new kk    {      aa = "test",      bb = 789,      cc = true,      dd = DateTime.Now.AddDays(2)    }, null));Response.Write(json);

您可以重新構造帶參數的特性或者修改injectAct對象，改成適合自己的

下面寫個測試，改成運算式樹狀架構最好了，先上個碼

using System;using System.Linq;using System.Dynamic;using System.Reflection;using System.Linq.Expressions;using System.Collections.Generic;using System.Collections.Concurrent;namespace Tools{  public class Class2Map  {    private static readonly ConcurrentDictionary<RuntimeTypeHandle, PropertyInfo[]>      DynamicObjectProperties = new ConcurrentDictionary<RuntimeTypeHandle, PropertyInfo[]>();    private static PropertyInfo[] GetObjectProperties<T>()    {      var type = typeof(T);      var key = type.TypeHandle;      PropertyInfo[] queryPts = null;      DynamicObjectProperties.TryGetValue(key, out queryPts);      if (queryPts == null)      {        queryPts = type.GetProperties();        DynamicObjectProperties.TryAdd(key, queryPts);      }      return queryPts;    }    /// <summary>    /// 單個對象映射    /// </summary>    /// <typeparam name="T">類型</typeparam>    /// <param name="source">執行個體</param>    /// <param name="injectAct">map方法集</param>    /// <returns>映射後的動態對象</returns>    public static IDictionary<string, Object> DynamicResult<T>(T source, params MapCondition[] injectAct)//where T : ICustomMap    {      var queryPts = GetObjectProperties<T>();      var dynamicResult = new ExpandoObject() as IDictionary<string, Object>;      foreach (var p in queryPts)      {        var attributes = p.GetCustomAttributes(typeof(IngoreProperty), true);        if (attributes.FirstOrDefault() != null) continue;        var _name = p.Name;           //原來是屬性名稱        var _value = p.GetValue(source, null); //原來的屬性值        object _resultvalue = _value;      //最終的映射值        if (injectAct != null)        {          string _tempname = null;          var condition = injectAct.FirstOrDefault(x => x.Orginal == _name);          if (CheckChangeInfo(condition, out _tempname))          {            _resultvalue = condition.fn.Invoke(_value);            dynamicResult.Add(_tempname ?? _name, _resultvalue);            continue;          }        }        //var value = Convert.ChangeType(value，typeof(string));         dynamicResult.Add(_name, _resultvalue);      }      return dynamicResult;    }    /// <summary>    /// 合并2個對象    /// </summary>    /// <typeparam name="TSource">對象1類型</typeparam>    /// <typeparam name="TTarget">對象2類型</typeparam>    /// <param name="s">對象1執行個體</param>    /// <param name="t">對象2執行個體</param>    /// <returns>合并後的動態對象</returns>    public static IDictionary<string, Object> MergerObject<TSource, TTarget>(TSource s, TTarget t)    {      var targetPts = GetObjectProperties<TSource>();      PropertyInfo[] mergerPts = null;      var _type = t.GetType();      mergerPts = _type.Name.Contains("<>") ? _type.GetProperties() : GetObjectProperties<TTarget>();      var dynamicResult = new ExpandoObject() as IDictionary<string, Object>;      foreach (var p in targetPts)      {        var attributes = p.GetCustomAttributes(typeof(IngoreProperty), true);        if (attributes.FirstOrDefault() != null) continue;        dynamicResult.Add(p.Name, p.GetValue(s, null));      }      foreach (var p in mergerPts)      {        var attributes = p.GetCustomAttributes(typeof(IngoreProperty), true);        if (attributes.FirstOrDefault() != null) continue;        dynamicResult.Add(p.Name, p.GetValue(t, null));      }      return dynamicResult;    }    /// <summary>    /// 合并2個對象    /// </summary>    /// <typeparam name="TSource">對象1類型</typeparam>    /// <typeparam name="TTarget">對象2類型</typeparam>    /// <param name="s">對象1執行個體</param>    /// <param name="t">對象2執行個體</param>    /// <returns>合并後的動態對象</returns>    public static List<IDictionary<string, Object>> MergerListObject<TSource, TTarget>(List<TSource> s, TTarget t)    {      var targetPts = GetObjectProperties<TSource>();      PropertyInfo[] mergerPts = null;      var _type = t.GetType();      mergerPts = _type.Name.Contains("<>") ? _type.GetProperties() : GetObjectProperties<TTarget>();      var result = new List<IDictionary<string, Object>>();      s.ForEach(x =>      {        var dynamicResult = new ExpandoObject() as IDictionary<string, Object>;        foreach (var p in targetPts)        {          var attributes = p.GetCustomAttributes(typeof(IngoreProperty), true);          if (attributes.FirstOrDefault() != null) continue;          dynamicResult.Add(p.Name, p.GetValue(x, null));        }        foreach (var p in mergerPts)        {          var attributes = p.GetCustomAttributes(typeof(IngoreProperty), true);          if (attributes.FirstOrDefault() != null) continue;          dynamicResult.Add(p.Name, p.GetValue(t, null));        }        result.Add(dynamicResult);      });      return result;    }    private static bool CheckChangeInfo(MapCondition condition, out string name)    {      name = null;      bool result = condition != null &&             condition.fn != null &&             !string.IsNullOrWhiteSpace(condition.Orginal);//&&            //!string.IsNullOrWhiteSpace(condition.NewName);      if (result)      {        var temp = condition.NewName;        name = (string.IsNullOrWhiteSpace(temp) || temp.Trim().Length == 0) ? null : temp;      }      return result;    }  }}

測試一下：

List<KeyValue> kk = new List<KeyValue> {   new KeyValue{key="aaa", value="111"},  new KeyValue{key="bbb", value="222"},  new KeyValue{key="ccc", value="333"},  new KeyValue{key="ddd", value="444"},};var result = Class2Map.MergerListObject<KeyValue, dynamic>(kk, new { p = "jon test" });var json = JsonUtils.JsonSerializer(result);Response.Write(json);

輸出如下：

[{"key":"aaa","value":"111","p":"jon test"},{"key":"bbb","value":"222","p":"jon test"},{"key":"ccc","value":"333","p":"jon test"},{"key":"ddd","value":"444","p":"jon test"}]var result = Class2Map.MergerObject<KeyValue, dynamic>(        new KeyValue { key = "aaa", value = "111" },        new { p = "jon test" }      );var json = JsonUtils.JsonSerializer(result);Response.Write(json);

輸出如下：

{ "key": "aaa", "value": "111", "p": "jon test" }