SevenMgCreatine
LINQ: Duplicate key after GroupBy
Hello,
I have the following problem: I get an ArgumentException in the following code:
https://paste.mod.gg/jmzxdwctfzpw/0
The exception in the client system is: System.ArgumentException - An item with the same key has already been added. I don't understand how this could happen, because I
m already grouping the values by the userid and this is also the key for the dictionary. So "GroupBy" creates multiple groups with the "same key"?
I don't have access to the client system, so Im looking for potential causes for the exception. I am working with EF Core.
Thanks for helping.13 replies