EF Core SqlNullValueException: 'Data is Null.' – How Can I Debug This?

Entity Framework Core: SqlNullValueException: Data is Null. How to troubleshoot?

Entity Framework Core (EF Core) is an object-relational mapping (ORM) framework for .NET that enables you to work with a database using .NET objects. When you use EF Core, you can specify the mapping between your .NET objects and the database tables and columns.

If you are using EF Core and you encounter a SqlNullValueException with the message "Data is Null.", it means that EF Core is trying to read a value from the database for a property that is marked as Required in your model, but the value is actually null in the database.

There are a few possible causes of this error:

• The column in the database is not nullable, but the property in your model is nullable.
• The value in the database is actually null, and the property in your model is not nullable.
• There is a problem with the EF Core mapping between the property and the column.

Here are some things you can try to troubleshoot the issue:

• Check the database schema to make sure that the column is nullable.
• Check your model to make sure that the property is not nullable.
• Check the EF Core mapping to make sure that it is correct.

If you have verified all of these things and you are still getting the error, you can try the following:

• Enable detailed errors in EF Core by calling the EnableDetailedErrors method on the DbContextOptionsBuilder. This will provide more information about the error, including the name of the property that is causing the issue.
• Use a tool like EF Core Power Tools to generate the SQL query that EF Core is executing. This can help you to identify the exact problem.

Once you have identified the cause of the error, you can fix it by:

• Updating the database schema to make the column nullable.
• Updating your model to make the property nullable.
• Updating the EF Core mapping to make it correct.

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