.NET框架-Clone如何由浅变深的示例代码详解-木庄网络博客

本文摘自PHP中文网，作者黄舟，侵删。

有的场合下，我们需要浅复制便能解决问题，因为我们复制出来的实例，仍然引用原来的初始对象。但是有的时候，这是不够的，因为我们复制出来的实例，还要对引用类型做出局部值的修改调整，并且保证不能影响初始对象！

这便要求深度复制了！

需求是这样的：
首先看一下浅复制为什么不能满足我们的要求：我们要复制简历，并且复制出的版本只与模板简历的求职意向中的公司名称不一致。

我们的第一版代码是这样的：

简历模型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();
    }
 
 
}

里面嵌套的子类教育背景对象EducationInfo

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

还有嵌套的对象WantedJob1:

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

我们在客户端使用下：

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";

但是我们得到了公司名称都是”ali”

这是典型的浅复制！

不能满足公司名称要区分的要求，继续修改，变为深度复制：

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);          
    }
 
 
}

求职意向对象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();
     }
 }

客户端调用：

//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";