Enumerable.Range Method

July 28, 2014

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 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)
      {
         outputBlock.Text += num + "\n";
      }

      /*
       This code produces the following output:

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



Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

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