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Editorial Team
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Asked: 2026-05-23T17:53:10+00:00

I think the title pretty much nails it. I am using a Char(36) in

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I think the title pretty much nails it.

I am using a Char(36) in a MySql table which automatically gets recognized as a GUID when using the Entity Framework.

Inserting the GUID is no problem, but trying to compare it in a WHERE clause is a nightmare.

What I’ve tried:

First of all I’ve tried a WHERE element.GUID == GuidToCompare.

This resulted in LINQ to Entities does not recognize the method 'System.Object CompareObjectEqual(System.Object, System.Object, Boolean)' method, and this method cannot be translated into a store expression.

Then I tried to just convert the value to String, like so:

WHERE element.GUID.ToString() == GuidtoCompare.ToString()

This resulted in this error: LINQ to Entities does not recognize the method 'System.String ToString()' method, and this method cannot be translated into a store expression.

So either way, I just can’t compare them. I am ready to just not use GUIDs if they don’t work out.

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1 Answer

  1. Editorial Team

    I know what was wrong: It was just a stupid error of myself.

    The thing with comparing guids was quite correct, this was not the part that gave the error. Actually a later part in the same LINQ query fired the error. It compared ProviderUserKey (Object) to ID (int). The ProviderUserKey is essentialls an int, I just had to explicitly state it’s type ( CType(Object, Integer) in VB.NET or (int)Object in C#)

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