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{TOC}

Back to Standard Query Operator Index


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Introduction

The Intersect operator produces the set intersection of two sequences.

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Method Signatures

// 1 - Find the intersection between two sequences.
public static IEnumerable<TSource> Intersect<TSource>(
    this IEnumerable<TSource> first, 
    IEnumerable<TSource> second)
 
// New in January CTP
// 2 - Find the intersection between two sequences using custom comparer
public static IEnumerable<TSource> Intersect<TSource>(
    this IEnumerable<TSource> first, 
    IEnumerable<TSource> second, 
    IEqualityComparer<TSource> comparer)

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Exceptions

Throws an ArgumentNullException if first or second are null.

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Pseudo-code

Overload 1
If first is null, throw an ArgumentNullException.
If second is null, throw an ArgumentNullException.
Iterate the second sequence.
Iterate the first sequence.

Overload 2 - custom comparer
If first is null, throw an ArgumentNullException.
If second is null, throw an ArgumentNullException.
If comparer is null, default to EqualityComparer<TSource>.Default;
Iterate the second sequence.
Iterate the first sequence.

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Loop Count

1 loop through second sequence initially, then 1 loop through the first sequence as an iterator. 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.