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Editorial Team
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Asked: 2026-05-24T20:50:21+00:00

I am using the Entity Framework with MySQL, and every table has a ID

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I am using the Entity Framework with MySQL, and every table has a ID column that is of type CHAR(36). In the EDMX file they are all of type System.Guid, and the SSDL xml looks like:

<EntityType Name="Accounts">
  <Key>
    <PropertyRef Name="ID" />
  </Key>
  <Property Name="ID" Type="guid" Nullable="false" />
  ...

When I try to use any method (Single, Where, Any, etc), it throws an InvalidOperationException stating that the sequence contains no elements. Here’s the weird part, if I expand the results view in the debugger, it does show the elements. The GUID values are the same, so it should be returning exactly one element. I have included a picture below (right click save as to see larger), but can anyone explain what is going on here? The GUID’s do match:

(method argument) accountID: 
{7767402f-9b29-4026-b40d-6eb991748f8c}
(should match) element in results view:
{7767402f-9b29-4026-b40d-6eb991748f8c}

enter image description here

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1 Answer

  1. Editorial Team

    My bet is that it’s a bug in the MySQL connector and that it has to do with how the GUID is stored in the DB. For some reason the comparison is not working. I think you should use BINARY(16) instead of CHAR(36).

    Check out the answer to this question: Storing MySQL GUID/UUIDs

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