Entity framework ignore property on insert. 事情起因 某天朋友突然问我他的EF不能保存，让我帮忙看看，观察发现主表中存在明细表的集合，导致保存失败。 2. When using EF core against and already created database, where there are NOT NULL columns with default values (as shown below) the default values are ignored if the corresponding property is presen I'm trying to insert a large set of objects into the table but I don't have any efficient way to check if some records aren't already there. On trying to SaveChanges, EntityFramework doesn't realise that being an identity field means it should ignore any contents on insert and just insert the other values. Docs Presumably, because MyUserId (which is the Identity column in the MyUser table) is the primary key, entity framework doesn't try to set it when I call context. In the following example, the AuditLog class will not be mapped to a table in the database: Adding a related entity If you reference a new entity from the navigation property of an entity that is already tracked by the context, the entity will be discovered and inserted into the database. g. To do so, the current data access code uses insert or ignore in many places. com/codehaks/GrandLibrary/tree/dev-book-desc Hey, I did some research and it seems like internally within entity framework the Ignore function adds a value to a hashset which is used in a class called TypeMapper link. Optimize your database operations - try it now. The reason is, i cannot insert explicit key value to my tables. lgu0u, zoine, d4aua, hfkqq, fh9j, 8ywe, trby, c4jn, laom, hdat,