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  • Generation Operators in LINQ

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    In this blog we illustrate the generation operators in linq.
    We have a three Generation Operators :
    1. Empty
    2. Range
    3. Repeat


    1. Empty:-
    Empty operator  is used to return an empty sequence of the type that is specified . It is a static method  involved in Enumerable static class.

     

    Example:-
    To understand Empty operator, see the below code:-

                var data1 = Enumerable.Empty<int>();
                var data2 = Enumerable.Empty<Employee>();
    
                Console.WriteLine("Count: {0} ", data1.Count());
                Console.WriteLine("Type: {0} ", data1.GetType().Name);
    
                Console.WriteLine("Count: {0} ", data2.Count());
                Console.WriteLine("Type: {0} ", data2.GetType().Name);
    

     

    Output:-

     

    2. Range:-
    Range operator returns an integer sequence  with specified number of items and sequential values starting from the first item. It takes two parameters, start index and end index.


    Example:-
    In the below code, we generate an integer sequence from 1 to 20.
    Code:-

                var dataCollection = Enumerable.Range(1, 20);
                Console.WriteLine("Total Count: {0} ", dataCollection.Count());
    
                for (int i = 0; i < dataCollection.Count(); i++)
                    Console.WriteLine("Value at index {0} : {1}", i, dataCollection.ElementAt(i));
    

     

    Output:-

     

    3. Repeat:-
    Repeat operator is used to repeat a specified statement/item. It accepts two parameters,  First parameter is the statement/item that is to be repeated and the second parameter is used to define a number of times the first parameter is to be repeated.

     

    Example:-
    Code:-

           var dataCollection = Enumerable.Repeat<string>("Dot Net", 3);
           Console.WriteLine("Total Count: {0} ", dataCollection.Count());
    
        for (int i = 0; i < dataCollection.Count(); i++)
                Console.WriteLine("Value at index {0} : {1}", i, dataCollection.ElementAt(i));
    

     

    Output:-

     

     

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