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Apr 16, 2014 · Entity Framework must have a key field in order to work. It doesn't have to be a true primary key in the database but it needs to be unique.
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Oct 30, 2017 · Save this question. Show activity on this post. I want to insert a new entry into my database with the following commands:
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Dec 2, 2019 · Unable to track an entity 'User' of type because primary key property 'id' is null. Here User represents my extension of the Identity model.
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Jan 25, 2017 · My question is why is it trying to insert NULL in Id column when I deploy the application and not when I run the code without deployment? entity ...
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May 27, 2013 · The TableNumber column is primary key of integer data type (see "Primary Key column properties" image file). I have installed the latest EF6 ...
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Apr 27, 2019 · The error message indicates that EF Core is trying to read string value for a required property, i.e. a property which should never have null ...
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Apr 11, 2023 · If that is an SQL Server database for instance, go into the table designer and for the PK field, look for the "Identity" option and select "Yes" ...
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Mar 25, 2009 · Workaround for Linq-to-SQL: var result = from entry in table where entry.something.Equals(value) select entry;.
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Aug 20, 2019 · No, you cannot compose a primary key from nullable columns. However, if you just need to query this table (no inserts or updates), ...
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