Enumerable.Range Method
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Generates a sequence of integral numbers within a specified range.
Namespace: System.Linq
Assembly: System.Core (in System.Core.dll)
Syntax
'Declaration
Public Shared Function Range ( _
start As Integer, _
count As Integer _
) As IEnumerable(Of Integer)
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.
Exceptions
| Exception | Condition |
|---|---|
| ArgumentOutOfRangeException | count is less than 0. -or- start + count -1 is larger than MaxValue. |
Remarks
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.
Examples
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.
outputBlock.Text &= output.ToString() & vbCrLf
' This code produces the following output:
'
' 1
' 4
' 9
' 16
' 25
' 36
' 49
' 64
' 81
' 100
// 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
*/
Version Information
Silverlight
Supported in: 5, 4, 3
Silverlight for Windows Phone
Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0
XNA Framework
Supported in: Xbox 360, Windows Phone OS 7.0
Platforms
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.