Enumerable.Range Method (Int32, Int32)

 

Generates a sequence of integral numbers within a specified range.

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

Public Shared Function Range (
	start As Integer,
	count As Integer
) As IEnumerable(Of Integer)

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(Of Int32)

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

Exception Condition
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 project their squares.
Dim squares As IEnumerable(Of Integer) = _
    Enumerable.Range(1, 10).Select(Function(x) x * x)

Dim output As New System.Text.StringBuilder
For Each num As Integer In squares
    output.AppendLine(num)
Next

' Display the output.
MsgBox(output.ToString())

' This code produces the following output:
'
' 1
' 4
' 9
' 16
' 25
' 36
' 49
' 64
' 81
' 100

Universal Windows Platform
Available since 8
.NET Framework
Available since 3.5
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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