Verification on one or more entities fails. For more information, see the "EntityValidationErrors" attribute ., Detailed steps for opening a physical store

Verification on one or more entities fails. For more information, see the "EntityValidationErrors" attribute ., Detailed steps for opening a physical store

The cause of the problem: a field in the database table cannot be blank. When modifying object attributes, the field in the table corresponding to the object cannot be null.

Details:

Database:

C #:

Error code:

            static void EditAdvance()            {                Category c = new Category() { CategoryID = 11,Description = "bad" };                 System.Data.Entity.Infrastructure.DbEntityEntry<Category> a = db.Entry<Category>(c);                a.State = System.Data.EntityState.Unchanged;                a.Property("Description").IsModified = true;                db.SaveChanges();                Console.WriteLine("modify success");            }

 

Correct code:

            static void EditAdvance()            {                Category c = new Category() { CategoryID = 11, CategoryName="new",Description = "bad" };                 System.Data.Entity.Infrastructure.DbEntityEntry<Category> a = db.Entry<Category>(c);                a.State = System.Data.EntityState.Unchanged;                a.Property("Description").IsModified = true;                db.SaveChanges();                Console.WriteLine("modify success");            }