.NET架構-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執行個體，仍然引用原來的初始對象。但是有的時候，這是不夠的，因為我們複製出來的執行個體，還要對參考型別做出局部值的修改調整，並且保證不能影響初始對象！

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：我們要複製簡曆，並且複製出的版本只與模板簡曆的求職意向中的公司名稱不一致。

我們的第一版代碼是這樣的：

簡曆模型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();        }    }

裡面嵌套的子類教育背景對象EducationInfo

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

還有嵌套的對象WantedJob1:

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

我們在用戶端使用下：

            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;                        //假定各個簡曆版本，僅僅companyName屬性值不同。            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！

不能滿足公司名稱要區分的要求，繼續修改，變為深度複製：

    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);                  }    }

求職意向對象2.0:

   //WantedJob2 實現介面    public class WantedJob2:ICloneable    {            public string companyName { get; set; }            public double eanrings { get; set; }            public object Clone()        {                    return this.MemberwiseClone();        }    }

用戶端調用：

            //此處我們需要對WantedJob做深複製處理。            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;                        //假定各個簡曆版本，僅僅companyName屬性值不同。            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！