Given the model: public abstract class Person { public int Id {get;set;} } public class Customer : Person
I have some code like this: var db = new MYContext(); var invoice = new Invoice { InvoiceId = 7 }; db.Set<Invoice>().Add(invoice);
This question already has answers here: Getting exact error type in from DbValidationException (8 answers)
I need to insert multiple records to different tables, the problem is that some tables have 2 different foreing keys and the EF throws me an exception. Part of my schema is shown below.
I have a scenario where the code under test inserts a record into a database, then attempts to retrieve it back from the database using its primary key.
Given the entities, class A { B DefaultB { get; set; } C DefaultC { get; set; } } class B { A { get; set; }
My application is using EF code-first design and all generally works very well. Via a private configuration file, I can specify how I would like EF to handle changes to the db schema, and so create/r
I have the following code, I am using the repository pattern in EF 4.1 and Unit of Work. However because I dont understand very much how Expression and Predicates works I ask the following:
I am just doing a small application with 3 tables. Applicants Positions ApplicantsPerPosition. This last one would be a many to many relationship with the other 2 tables.
I am using EF. and the repository Pattern. The specific question is how can I write the GetPositionByCustomExpression below so that from the caller I can pass an expression, sometimes the expression
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