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Shallow Copy vs. Deep Copy in .NET

, 10 Oct 2008 CPOL 153.7K 913 49
Shallow and deep copy are used for copying data between objects.
ShallowVsDeep.zip
ShallowVsDeep
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ShallowVsDeep.exe
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using System;
using System.Collections.Generic;
using System.Text;

namespace ShallowVsDeep
{
    class Program
    {
        static void Main(string[] args)
        {
            clsRefSalary clsref; int EmpSalary;
            //
            Console.Write("Shallow Copy Tracing:\n---------------------------------\n");
            // Creates an instance of clsShallow and assign values to its fields.
            clsShallow objshallow = new clsShallow();
            objshallow.Age = 25;
            objshallow.EmployeeName = "Ahmed Eid";

            // add the ref value
            clsref = new clsRefSalary(1000);
            objshallow.EmpSalary = clsref;

            // Performs a shallow copy of m1 and assign it to m2.
            clsShallow m2 = objshallow.CreateShallowCopy(objshallow);

            clsShallow m3 = m2;

            // then modify the clsref salary value to be 2000 
            clsref.Salary = 2000;

            // so the m1 object salary value become 2000
            EmpSalary = objshallow.EmpSalary.Salary;

            Console.Write("Name: {0}\nAge: {1}\nSalary: {2}\n\n",objshallow.EmployeeName,objshallow.Age,objshallow.EmpSalary.Salary);

            Console.Write("Deep Copy Tracing:\n---------------------------------\n");
            // Creates an instance of clsDeep and assign values to its fields.
            clsDeep objdeep = new clsDeep();
            objdeep.Age = 25;
            objdeep.EmployeeName = "Ahmed Eid";

            // add the ref value
            clsref = new clsRefSalary(1000);
            objdeep.EmpSalary = clsref;

            // Performs a shallow copy of m1 and assign it to m2.
            clsDeep m4 = objdeep.CreateDeepCopy(objdeep);

            clsDeep m5 = m4;

            // then modify the clsref salary value to be 2000 
            clsref.Salary = 2000;

            // so the m1 object salary value become 2000
            EmpSalary = objdeep.EmpSalary.Salary;

            Console.Write("Name: {0}\nAge: {1}\nSalary: {2}\n\n", objshallow.EmployeeName, objshallow.Age, objshallow.EmpSalary.Salary);
        }
    }
}

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This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Ahmad Eid Salim
Software Developer (Senior)
Egypt Egypt
No Biography provided

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