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Lazy initialization of object in C# with Lazy class

, 10 Aug 2011
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Lazy initialization of object in C# with Lazy class

Lazy<T> is a class introduced in the .NET Framework 4.0 to initialize the object later on, i.e., allows to initialize object when we are going to utilize or assign value to the object.

To understand Lazy initialization, consider the below class:

public class Employee
    {
        public string Name { get; set; }
        public int Salary { get; set; }
        public string Address { get; set; }
        public int Id { get; set; }
    }

In the following code, I am using the Employee class. As you can see, I have initialized the class to null.

Employee emp1=null;
     Console.WriteLine(emp1);
     ///Code do perform other task
     if(Condition)
     {
      if (emp1 == null)
        emp1 = new Employee();
     }

In the above code, I am initializing class when I need it rather than initializing before using it same way we can do in the Singleton design pattern. By this way, we are lazing initializing the object and consume memory when we need it rather than initializing it in the first line of the method.

But now .NET 4.0 Framework provides the new class to do this thing easily. The class is Lazy<T>. So the above code is something as below:

Lazy<employee> emp = new Lazy<employee>();
     Console.WriteLine(emp);

     emp.Value.Id = 1;
     emp.Value.Name = "pranay";
     emp.Value.Salary = 123;
     emp.Value.Address = "Ahmedabad";
     Console.WriteLine(emp);

Output of the program is as follows:

As you can see in output window, in its display no value is defined.

Important Properties

Object gets created when we access property Value and assign value to it. To find out the details, I used reflector which shows that the object get created when I access property.

Another important property is IsValueCreated-Gets a value that indicates whether a value has been created for this Lazy instance.

License

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

Pranay Rana
Software Developer (Senior) GMind Solusion
India India

Microsoft C# MVP (12-13)

 
Hey, I am Pranay Rana, working as a ITA in MNC. Web development in Asp.Net with C# and MS sql server are the experience tools that I have had for the past 5.5 years now.
 
For me def. of programming is : Programming is something that you do once and that get used by multiple for many years
 

You can visit my blog

StackOverFlow - http://stackoverflow.com/users/314488/pranay
My CV :- http://careers.stackoverflow.com/pranayamr
 
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Comments and Discussions

 
QuestionFeedback PinmemberModestas Krusa24-Jul-13 20:22 
GeneralMy vote of 5 Pinmemberhoernchenmeister1-Aug-11 21:14 
GeneralRe: My vote of 5 PinmemberPranay Rana11-Aug-11 0:26 

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