Export (0) Print
Expand All

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)

'Declaration
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.

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 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

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0

Portable Class Library

Supported in: Portable Class Library

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8
Show:
© 2015 Microsoft