C#对集合进行深度复制,C#深度复制封装

@TOC

场景说明

有时候方法更改外部传进来的对象，又不得不对其进行修改再返回结果时
直接上代码

pubilc class ToolX
{
	public static object Clone(object obj)
	{
	    if (obj == null || obj.GetType().BaseType == typeof(ValueType)) return obj;
	    try
	    {
	        Type t = obj.GetType();
	        if (obj is ICloneable) return (obj as ICloneable).Clone();
	        if (t == typeof(System.Data.DataTable)) return (obj as System.Data.DataTable).Copy();
	        if (t == typeof(System.Data.DataSet)) return (obj as System.Data.DataSet).Copy();
	        if (obj is System.Collections.IDictionary)
	        {
	            var dic = (obj as System.Collections.IDictionary);
	            var nDic = t.Assembly.CreateInstance(t.FullName) as System.Collections.IDictionary;
	            if (dic != null && nDic != null)
	            {
	                foreach (var k in dic.Keys)
	                {
	                    if (nDic.Contains(k) == false) nDic.Add(k, dic[k]);
	                }
	                return nDic;
	            }
	        }
	        if (t.IsGenericType)//是集合
	        {
	            //A方案，不需要对类标记Serializable，但性能比B方案差（千次170ms）
	            object retval;
	            using (System.IO.MemoryStream ms = new System.IO.MemoryStream())
	            {
	                System.Xml.Serialization.XmlSerializer xml = new System.Xml.Serialization.XmlSerializer(t);
	                xml.Serialize(ms, obj);
	                ms.Seek(0, System.IO.SeekOrigin.Begin);
	                retval = xml.Deserialize(ms);
	                ms.Close();
	            }
	            return retval;
	            //B方案，需要对类标记Serializable（千次40ms）
	            //using (System.IO.Stream objectStream = new System.IO.MemoryStream())
	            //{
	            //    System.Runtime.Serialization.IFormatter formatter = new System.Runtime.Serialization.Formatters.Binary.BinaryFormatter();
	            //    formatter.Serialize(objectStream, obj);
	            //    objectStream.Seek(0, System.IO.SeekOrigin.Begin);
	            //    return formatter.Deserialize(objectStream);
	            //}
	        }
	        else //是一个类
	        {
	            var nObj = t.Assembly.CreateInstance(t.FullName);
	            foreach (System.Reflection.FieldInfo f in t.GetFields()) f.SetValue(nObj, f.GetValue(obj));
	            foreach (System.Reflection.PropertyInfo p in t.GetProperties()) p.SetValue(nObj, p.GetValue(obj, null), null);
	            return nObj;
	        }
	    }
	    catch (Exception e) 
	    { 
	        /*日志自行实现*/ 
	        throw e; 
	    }
	    return obj;
	}
}

原文链接：/2020-07-03-csharp-clone.html

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