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Month: November 2021

JSON deserialisation exception with Enumerable.Empty

21 November 2021 / Leave a Comment

I came across this exception in the past after upgrading .NET Core 2.2 to 3.0. I didn’t write about it before but recently I saw this exception again in our error logs so I thought I’d write about this and how to solve it. If you have a model like this That Enumerable.Empty<Author>() is to … [Read more…]

Posted in: Uncategorised Tagged: .Net Core, Json, Json Deserialisation

Cartesian Explosion problem in Entity Framework

7 November 2021 / Leave a Comment

In relational databases like SQL, you can load related entities using Joins. In case of one-to-many relationships, this would lead to duplicated data returned. For example, entity Book has one-to-many Comments. If a book has 3 comments, the query below will return 3 rows, one for each comment with duplicate data for the book. Now … [Read more…]

Posted in: Uncategorised Tagged: EF Core, Net Core, Split Queries, SQL

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