Error when saving ObjectContext after replacing Parent item and linking Child item to it



Category : Coding

In my application, the interface allows the user to create and delete entities in an Entity Framework model. All changes are added to the ObjectContext, and saved only when the user selects "Save".


My question is best asked by means of the following simple example:


I have a Foreign Key relation between two entity types, which I will call Parent and Child here. The database, in SQLite, is declared as follows:


CREATE TABLE Parents (ID INTEGER PRIMARY KEY);
CREATE TABLE Children (ID INTEGER PRIMARY KEY,
ParentID INTEGER NOT NULL CONSTRAINT FK_Chi

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