How do I perform a case-insensitive compare of GUIDs with LINQ?

Question

In the code below, I want to compare two GUIDs. The problem is I don\'t get any tasks returned because the GUIDS are different case (uppercase vs. lowercase). I need to perf

Answer 1

The == is overloaded on Guid so you don't need to compare the string representations.

See http://msdn.microsoft.com/en-us/library/system.guid.op_equality(v=VS.90).aspx

Answer 2

An easy way to ignore case when doing a string comparison is just convert everything to lower (or upper) case before you compare it. So:

var userTasks = dc.tasks.Where(t => t.user_id.ToString().ToLower() == userId.ToString().ToLower()).ToList();

That being said, I agree with the other commenters that you should be using a native GUID comparison, not a string comparison.

Answer 3

Not sure why you're comparing them as text, but instead of t.user_id == userId use t.userId.Equals(userId, StringComparison.OrdinalIgnoreCase)

Answer 4

I always had a dillema of using == for guid/uniqueidentifier columns comparison in linq statements (especially in where clause) so I took a rather safe route of using - (entityGuidColumn.CompareTo(guidParameter)==0) . This worked for me. Give it a shot.