entity framework inserting a many-to-many relationship between two existing objects while updating
- by redbluegreen
I'm trying to do this:
using(var context = new SampleEntities())
{
User user = select a user from database;
//Update user's properties
user.Username = ...
user.Website = ...
//Add a role
Role role = select a role from database
//trying to insert into table UserRoles which has columns (UserID, RoleID)
user.Roles.Add(role);
//Apply property changes
context.ApplyPropertyChanges("Users", user);
context.SaveChanges();
}
However, I get an exception telling me that "The existing object in the ObjectContext is in the Added state" and can't "ApplyPropertyChanges".
If "ApplyPropertyChanges()" is removed, it adds a User.
What orders should these methods be called? I don't need to do them separately right?
Thanks.
