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Enumerable.Range Method

Generates a sequence of integral numbers within a specified range.

Namespace:  System.Linq
Assembly:  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 three integers starting at 4, 
            // and then select their squares.
            IEnumerable<int> squares = Enumerable.Range(4, 3).Select(x => x * x);

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

            /*
             This code produces the following output:
             16
             25
             36
            */



.NET Framework

Supported in: 4, 3.5

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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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