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Back to Standard Query Operator Index


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Introduction

The Concat operator concatenates two sequences. It returns all elements from the first sequence, then all elements from the second sequence. If you want duplicate elements returned, consider using the Union operator instead.

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Method Signatures

public static IEnumerable<TSource> Concat<TSource>(
    this IEnumerable<TSource> first, 
    IEnumerable<TSource> second)

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Exceptions

Throws an ArgumentNullException if first or second is null.

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Pseudo-code

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