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Serializing Objects using C#

Introduction

In simple words serialization is a process of storing the object instance to a disk file. Serialization stores state of the object i.e. member variable values to disk. Deserialization is reverse of serialization i.e. it's a process of reading objects from a file where they have been stored. In this code sample we will see how to serialize and deserialize objects using C#.

Namespaces involved

Following namespaces are involved in serialization process :

  • System.Runtime.Serialization
  • System.Runtime.Serialization.Formatters.Binary

Example 1

using System;
using System.IO;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Formatters.Binary;




public class SerialTest
{

    public void SerializeNow()
    {
        ClassToSerialize c=new ClassToSerialize();
        File f=new File("temp.dat");
        Stream s=f.Open(FileMode.Create);
        BinaryFormatter b=new BinaryFormatter();
        b.Serialize(s,c);
        s.Close();
    }

    public void DeSerializeNow()
    {
        ClassToSerialize c=new ClassToSerialize();
        File f=new File("temp.dat");
        Stream s=f.Open(FileMode.Open);
        BinaryFormatter b=new BinaryFormatter();
        c=(ClassToSerialize)b.Deserialize(s);
        Console.WriteLine(c.name);
        s.Close();
    }

    public static void Main(string[] s)
    {

        SerialTest st=new SerialTest();
        st.SerializeNow();
        st.DeSerializeNow();

    }

}



public class ClassToSerialize
{
    public int age=100;
    public string name="bipin";

}

Explanation

Here we have our own class named ClassToSerialize. This class has two public variables name and age with some default values. We will write this class to a disk file (temp.dat) using SerializeTest class.

SerializeTest class has two methods SerializeNow() and DeSerializeNow() which perform the task of serialization and deserialization respectively.

The general steps for serializing are :

  • Create an instance of File that will store serialized object
  • Create a stream from the file object
  • Create an instance of BinaryFormatter
  • Call serialize method of the instance passing it stream and object to serialize

The steps for de-serializing the object are similar. The only change is that you need to call deserialize method of BinaryFormatter object.

Example 2

Now, let us see an example where we have used 'real' class with public and shared members and properties to encapsulate them. The class also uses another supporting class. This is just to make clear that if your class contains further classes, all the classes in the chain will be serialized.

using System;
using System.IO;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Formatters.Binary;
public class SerialTest
{
	public void SerializeNow()
	{
	ClassToSerialize c=new ClassToSerialize();
	File f=new File("temp.dat");
	Stream s=f.Open(FileMode.Create);
	BinaryFormatter b=new BinaryFormatter();
	b.Serialize(s,c);
	s.Close();
	}

	public void DeSerializeNow()
	{
	ClassToSerialize c=new ClassToSerialize();
	File f=new File("temp.dat");
	Stream s=f.Open(FileMode.Open);
	BinaryFormatter b=new BinaryFormatter();
	c=(ClassToSerialize)b.Deserialize(s);
	Console.WriteLine(c.name);
	s.Close();
	}

	public static void Main(string[] s)
	{
		SerialTest st=new SerialTest();
		st.SerializeNow();
		st.DeSerializeNow();
	}
}




public class ClassToSerialize
{
    private int age;
    private string name;
    static string companyname;
    SupportClass supp=new SupportClass();

    public ClassToSerialize()
    {
        supp.SupportClassString="In support class";

    }

    public int Age
    {
        get
        {
            return age;
        }
        set
        {
            age=value;
        }

    }

    public string Name
    {
        get
        {
            return name;
        }
        set
        {
            name=value;
        }

    }

    public static string CompanyName
    {
        get
        {
            return companyname;
        }
        set
        {
            companyname=value;
        }

    }

    public string GetSupportClassString()
    {
        return supp.SupportClassString;
    }


}


public class SupportClass
{
    public string SupportClassString;

}

Example 3

The final example shows how to serialize array of objects.

using System;
using System.IO;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Formatters.Binary;


public class SerialTest
{

    public void SerializeNow()
    {
        ClassToSerialize[] c=new ClassToSerialize[3];

        c[0]=new ClassToSerialize();
        c[0].Name="bipin";
        c[0].Age=26;

        c[1]=new ClassToSerialize();
        c[1].Name="abc";
        c[1].Age=75;

        c[2]=new ClassToSerialize();
        c[2].Name="pqr";
        c[2].Age=50;

        ClassToSerialize.CompanyName="xyz";
        File f=new File("temp.dat");
        Stream s=f.Open(FileMode.Create);
        BinaryFormatter b=new BinaryFormatter();
        b.Serialize(s,c);
        s.Close();
    }

    public void DeSerializeNow()
    {
        ClassToSerialize[] c;
        File f=new File("temp.dat");
        Stream s=f.Open(FileMode.Open);
        BinaryFormatter b=new BinaryFormatter();
        c=(ClassToSerialize[])b.Deserialize(s);
        Console.WriteLine("Name :" + c[2].Name);
        Console.WriteLine("Age :" + c[2].Age);
        Console.WriteLine
("Company Name :" + ClassToSerialize.CompanyName);
        s.Close();
    }

    public static void Main(string[] s)
    {

        SerialTest st=new SerialTest();
        st.SerializeNow();
        st.DeSerializeNow();

    }

}



public class ClassToSerialize
{
    private int age;
    private string name;
    static string companyname;

    public int Age
    {
        get
        {
            return age;
        }
        set
        {
            age=value;
        }

    }

    public string Name
    {
        get
        {
            return name;
        }
        set
        {
            name=value;
        }

    }

    public static string CompanyName
    {
        get
        {
            return companyname;
        }
        set
        {
            companyname=value;
        }

    }

}

 


Bipin Joshi is a software consultant, an author and a yoga mentor having 22+ years of experience in software development. He also conducts online courses in ASP.NET MVC / Core and Design Patterns. He is a published author and has authored or co-authored books for Apress and Wrox press. Having embraced the Yoga way of life he also teaches Meditation and Mindfulness to interested individuals. To know more about him click here.

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Posted On : 06 May 2001


Tags : .NET Framework Components Programming Languages