Tag Archives: EF

EF core: entity cannot be tracked

Posted on April 21, 2020 by erictummers

We use EF core to store a bulk of data with an auto-number primary key. The auto-number is an Identity column in Sql Server. When inserting a large amount of records with related children we encounter this error: System.InvalidOperationException entity … Continue reading →

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EF codefirst migrations and Cloud Foundry

Posted on October 18, 2019 by erictummers

We’re using the hosted Cloud Foundry solution for development at http://run.pivotal.io. So everybody can hit the floor running I’ve created a template for using Entity Framework Codefirst migrations in a dotnet core web application hosted on Cloud Foundry. The key … Continue reading →

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Linq to entities and CAST

Posted on June 2, 2017 by erictummers

We use an EDMX to access our database with Entity Framework. Before you comment: we have our reasons not to use code-first. Today we encountered a small problem with linq to entities and validating a varchar field that contains an integer … Continue reading →

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Effort: Unhandled exception while trying to initialize the content of Table

Posted on March 2, 2017 by erictummers

We use Effort with the CsvDataLoader in our integration tests. After adding a new data file we got an exception. On the forum every thread ended with something like “my bad” or “never mind”. Looking closer to my csv file showed the error: a typo … Continue reading →

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Entity Framework Fake ObjectContext Realization Tool

Posted on October 24, 2016 by erictummers

With Effort (Entity Framework Fake ObjectContext Realization Tool) I can create integration tests for the datalayer in my project. The tool has an Entity Framework provider that works on an in-memory database. This means I can call SaveChanges without mocking it or having a dependency on a … Continue reading →

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