Export (0) Print
Expand All

Enumerable.Take<TSource> Method

Returns a specified number of contiguous elements from the start of a sequence.

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

public static IEnumerable<TSource> Take<TSource>(
	this IEnumerable<TSource> source,
	int count
)

Type Parameters

TSource

The type of the elements of source.

Parameters

source
Type: System.Collections.Generic.IEnumerable<TSource>
The sequence to return elements from.
count
Type: System.Int32
The number of elements to return.

Return Value

Type: System.Collections.Generic.IEnumerable<TSource>
An IEnumerable<T> that contains the specified number of elements from the start of the input sequence.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type IEnumerable<TSource>. When you use instance method syntax to call this method, omit the first parameter.

ExceptionCondition
ArgumentNullException

source is null.

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.

Take<TSource> enumerates source and yields elements until count elements have been yielded or source contains no more elements.

If count is less than or equal to zero, source is not enumerated and an empty IEnumerable<T> is returned.

The Take<TSource> and Skip<TSource> methods are functional complements. Given a sequence coll and an integer n, concatenating the results of coll.Take(n) and coll.Skip(n) yields the same sequence as coll.

In Visual Basic query expression syntax, a Take clause translates to an invocation of Take<TSource>.

The following code example demonstrates how to use Take<TSource> to return elements from the start of a sequence.


      int[] grades = { 59, 82, 70, 56, 92, 98, 85 };

      IEnumerable<int> topThreeGrades =
          grades.OrderByDescending(grade => grade).Take(3);

      outputBlock.Text += "The top three grades are:" + "\n";
      foreach (int grade in topThreeGrades)
      {
         outputBlock.Text += grade + "\n";
      }
      /*
       This code produces the following output:

       The top three grades are:
       98
       92
       85
      */



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

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

Community Additions

ADD
Show:
© 2014 Microsoft