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.NET框架-Clone如何由浅变深的示例代码详解

黄舟

发布： 2017-03-18 13:20:08

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1457人浏览过

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();
        }


    }

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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; }
    }

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还有嵌套的对象WantedJob1:

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

    }

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我们在客户端使用下：

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查看详情

            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";

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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);          
        }


    }

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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();
        }
    }

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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";

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得到不同的公司名称！深度复制成功！

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