Comparing Byte Arrays in LINQ to Objects

Question

In a LINQ query:

from c in results
where c.ByteField == byteData
select c;

I'm getting no results from this even though the bytes are the same:

byte[5] = 49, 50, 51, 52, 53

How do I compare bytes properly in LINQ to Objects?

Thanks.

@Axarydax - I wouldn't call that related. That answer properly tests length and that the same elements are in the array...but ignores sequence. In the OPs case, sequence matters as well. — Justin Niessner
– Justin Niessner, Commented Jan 19, 2011 at 19:38

Justin Niessner · Accepted Answer · 2011-01-20 01:41:05Z

13

In LINQ to Objects (as your post suggests in the title), you can use IEnumerable.SequenceEqual():

from c in results
where c.ByteField.SequenceEqual(byteData)
select c;

Unfortunately, it looks like you're using LINQ to SQL (or Entity Framework) based on your use of context. There's no SQL equivalent of SequenceEqual so this won't work in that case.

edited Jan 20, 2011 at 1:41

answered Jan 19, 2011 at 19:35

Justin Niessner

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4 Comments

Brian Mains Over a year ago

Oops, I didn't mean to have that there, it is actually LINQ to Objects. Thanks.

BlueRaja - Danny Pflughoeft Over a year ago

There are no array properties in LINQ-to-SQL (or Entity Framework) either, so that would be a non-issue.

Mark Whitaker Over a year ago

Not true - VARBINARY maps to byte[].

philu Over a year ago

Timestamp also maps to byte[].

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