As a nullable string gives a different result than null

Question

In general, the picture says it all. I have a string that is null and I cannot get my user with it. However, if I type null, it works.

I made this workaround that works, but I don't see how it is needed

I saw something about null primitives and EF 6 (I use EF6), but this is a string.

Does anyone know why?

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Update

As you can see here, I use. UseCSharpNullComparisonBehavior = true; Now I have tried both on Azure and SQL Express.

It is incredible that this works on a living system, we did some development, but nothing, as far as I know, should affect this.

I also updated to the latest version of EF from nuget.

Answer 1

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, Entity Framework - SQL. null, , EF IS NULL SQL

EDIT:

EF 6, , , , , :

objectContext.ContextOptions.UseCSharpNullComparisonBehavior = true;