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Enumerable.Range Method

Generates a sequence of integral numbers within a specified range.

Namespace:  System.Linq
Assemblies:   System.Linq (in System.Linq.dll)
  System.Core (in System.Core.dll)

public static IEnumerable<int> Range(
	int start,
	int count
)

Parameters

start
Type: System.Int32

The value of the first integer in the sequence.

count
Type: System.Int32

The number of sequential integers to generate.

Return Value

Type: System.Collections.Generic.IEnumerable<Int32>
An IEnumerable<Int32> in C# or IEnumerable(Of Int32) in Visual Basic that contains a range of sequential integral numbers.

ExceptionCondition
ArgumentOutOfRangeException

count is less than 0.

-or-

start + count -1 is larger than MaxValue.

This method is implemented by using deferred execution. The immediate return value is an object that stores all the information that is required to perform the action. The query represented by this method is not executed until the object is enumerated either by calling its GetEnumerator method directly or by using foreach in Visual C# or For Each in Visual Basic.

The following code example demonstrates how to use Range to generate a sequence of values.

            // Generate a sequence of integers from 1 to 10  
            // and then select their squares.
            IEnumerable<int> squares = Enumerable.Range(1, 10).Select(x => x * x);

            foreach (int num in squares)
            {
                Console.WriteLine(num);
            }

            /*
             This code produces the following output:

             1
             4
             9
             16
             25
             36
             49
             64
             81
             100
            */

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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