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{TOC}

Back to Standard Query Operator Index


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Introduction

The TakeWhile operator yields elements from a sequence while a test is true and then skips the remainder of the sequence.

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Method Signatures

// 1 - Return elements until the predicate returns false.
public static IEnumerable<TSource> TakeWhile<TSource>(
    this IEnumerable<TSource> source, 
    Func<TSource, bool> predicate)
 
// 2 - Return elements until the predicate returns false.
// The predicate has access to the current elements index.
public static IEnumerable<TSource> TakeWhile<TSource>(
    this IEnumerable<TSource> source, 
    Func<TSource, int, bool> predicate)
 

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Exceptions

Throws an ArgumentNullException if source or predicate are null.

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Pseudo-code

Overload 1
If source is null, throw an ArgumentNullException.
If predicate is null, throw an ArgumentNullException.
Iterate the source sequence.

Overload 2
If source is null, throw an ArgumentNullException.
If predicate is null, throw an ArgumentNullException.
Initialize a counter to zero.
Iterate the source sequence.

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Loop Count

This operator implements the standard deferred execution iterator pattern. This means, no looping will occur until the result is iterated over.

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Code Samples

TODO: Needs code sample.