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{TOC}

Back to Standard Query Operator Index


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Introduction

Compares two sequences and returns true only if the members values, order and count are identical. (This operated was new in the January CTP, it is identical to the EqualAll Operator that was in previous CTP's).

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Method Signatures

// 1 - Return true if the two sequences are equal in values, order and count.
public static bool SequenceEqual<TSource>(
    this IEnumerable<TSource> first, 
    IEnumerable<TSource> second)
 
// 2 - Return true if the two sequences are equal in values, order and count.
// Allows you to specify a custom comparer function.
public static bool SequenceEqual<TSource>(
    this IEnumerable<TSource> first, 
    IEnumerable<TSource> second, 
    IEqualityComparer<TSource> comparer)

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Exceptions

Throws an ArgumentNullException if first or second is null.


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Pseudo-code

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


Begin iterating the first and second sequences.

If there are any remaining second elements (more than the first sequence has), return false.
Else, return true. The sequence elements are equal in value, order and length.


Overload 2
If first is null, throw an ArgumentNullException.
If second is null, throw an ArgumentNullException.


Begin iterating the first and second sequences.

If there are any remaining second elements (more than the first sequence has), return false.
Else, return true. The sequence elements are equal in value, order and length.


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Loop Count

2 if true, < 2 if false. Iterates through both the first and second sequences. Will return false at the first difference.


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Code Samples

TODO: Needs code sample.