无法跟踪实体类型“用户”的实例，因为已经在跟踪另一个具有相同键值的“Id”实例

Question

I know about questions has already been asked, but solutions didn't help me.

The instance of entity type 'User' cannot be tracked because another instance with the same key value for {'Id'} is already being tracked. When attaching existing entities, ensure that only one entity instance with a given key value is attached. Consider using 'DbContextOptionsBuilder.EnableSensitiveDataLogging' to see the conflicting key values.

I use Identity update method and it is invoke this exception.

await _userManager.UpdateAsync(user);

Also I tried to use Repository pattern update and it is updating right.

public async Task UpdateAsync(TEntity entity)
{
    _dbSet.Update(entity);
    _context.Entry(entity).State = EntityState.Modified;
}

By using attach it isn't updating connected to user class(by navigation property).

public async Task UpdateAsync(TEntity entity)
{
    _dbSet.Attach(entity);
    _context.Entry(entity).State = EntityState.Modified;
}

What am i doing wrong? I think a class of Identity should work correctly.

Answer 1

Are you getting "user" twice? If you get a "user1" with id = 1 and "user2" with id = 1, you will have this problem.