.NET框架-Clone如何由淺變深的範例程式碼詳解

有的場合下，我們需要淺複製便能解決問題，因為我們複製出來的實例，仍然引用原來的初始物件。但是有的時候，這是不夠的，因為我們複製出來的實例，還要對引用型別做出局部值的修改調整，保證不能影響初始物件！

這便要求深度複製了！

需求是這樣的：
首先看一下淺複製為什麼不能滿足我們的要求：我們要複製簡歷，並且複製出的版本只與模板簡歷的求職意向中的公司名稱不一致。

我們的第一版程式碼是這樣的：

簡歷模型1.0版本

    public class ResumeInfo1:ICloneable
    {        
    public ResumeInfo1(string name, string telephone, EducationInfo educationInfo,WantedJob1 job)
        {            
        this._name = name;            
        this._telephone = telephone;            
        this._educationInfo = educationInfo;            
        this._wantedJob = job;
        }        
        private string _name;        
        public string name
        {            
        get { return this._name; }
        }       
         private string _telephone;        
         public string telephone
        {            
        get { return _telephone; }
        }        
        private EducationInfo _educationInfo;        
        public EducationInfo educationInfo
        {            
        get { return _educationInfo; }
        }        
        private WantedJob1 _wantedJob;        
        public WantedJob1 WantedJob
        {            
        get { return _wantedJob; }
        }        
        public object Clone()
        {           
        return this.MemberwiseClone();
        }


    }

裡面嵌套的子類別教育背景物件EducationInfo

    public class EducationInfo
    {        
    public string schoolName { get; set; }        
    public DateTime enrollTime { get; set; }        
    public DateTime leaveTime { get; set; }
    }

還有嵌套的物件WantedJob1:

    public class WantedJob1
    {        
    public string companyName { get; set; }        
    public double eanrings { get; set; }

    }

我們在客戶端使用下：

            EducationInfo educationInfo = new EducationInfo();
            WantedJob1 wantedJob = new WantedJob1();
            ResumeInfo1 templateResume = new ResumeInfo1("qaz", "18810002000", educationInfo, wantedJob);
            educationInfo.enrollTime = new DateTime(2010, 7, 1);
            educationInfo.leaveTime = new DateTime(2015, 1, 1);
            educationInfo.schoolName = "wsx";
            wantedJob1.companyName = "edc";
            wantedJob1.eanrings = 1000;            
            //假定各个简历版本，仅仅companyName属性值不同。

            var res1 = templateResume.Clone();
            (res1 as ResumeInfo1).WantedJob.companyName = "baidu";            
            var res2 = templateResume.Clone();
            (res1 as ResumeInfo1).WantedJob.companyName = "ali";

但是我們得到了公司名稱都是”ali”

#這是典型的淺複製！

無法滿足公司名稱要區分的要求，繼續修改，變成深度複製：

    public class ResumeInfo2:ICloneable
    {        
    public ResumeInfo2(string name, string telephone, EducationInfo educationInfo,WantedJob2 job)
        {            
        this._name = name;            
        this._telephone = telephone;            
        this._educationInfo = educationInfo;            
        this._wantedJob = job;
        }        //
        private void cloneJob(WantedJob2 job)
        {            
        this._wantedJob = job.Clone() as WantedJob2;
        }        private string _name;        
        public string name
        {            
        get { return this._name; }
        }        
        private string _telephone;        
        public string 
        telephone
        {            
        get { return _telephone; }
        }        
        private EducationInfo _educationInfo;        
        public EducationInfo educationInfo
        {            
        get { return _educationInfo; }
        }        
        private WantedJob2 _wantedJob;        
        public WantedJob2 WantedJob
        {            
        get { return _wantedJob; }
        }        
        public object Clone()
        {
            cloneJob(this._wantedJob);            
            return new ResumeInfo2(_name,_telephone,_educationInfo,_wantedJob);          
        }


    }

求職意願物件2.0:

   //WantedJob2 实现接口
    public class WantedJob2:ICloneable
    {        
    public string companyName { get; set; }        
    public double eanrings { get; set; }        
    public object Clone()
        {            
        return this.MemberwiseClone();
        }
    }

客戶端呼叫：

            //此处我们需要对WantedJob做深复制处理。

            EducationInfo educationInfo = new EducationInfo();
            WantedJob2 wantedJob = new WantedJob2();
            ResumeInfo2 templateResume = new ResumeInfo2("qaz", "18810002000", educationInfo, wantedJob);
            educationInfo.enrollTime = new DateTime(2010, 7, 1);
            educationInfo.leaveTime = new DateTime(2015, 1, 1);
            educationInfo.schoolName = "wsx";
            wantedJob.companyName = "edc";
            wantedJob.eanrings = 1000;            
            //假定各个简历版本，仅仅companyName属性值不同。

            var res1 = templateResume.Clone();
            (res1 as ResumeInfo2).WantedJob.companyName = "baidu";            
            var res2 = templateResume.Clone();
            (res2 as ResumeInfo2).WantedJob.companyName = "ali";

得到不同的公司名稱！深度複製成功！

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