当“回归”从'使用'块中调用该怎么办？ [英] What happens when 'return' is called from within a 'using' block?

问题描述

如果我有一个方法，using块这样的...

If I have a method with a using block like this...

    public IEnumerable<Person> GetPersons()
    {
        using (var context = new linqAssignmentsDataContext())
        {
            return context.Persons.Where(p => p.LastName.Contans("dahl"));
        }
    }

...从使用中返回值块，做了IDisposable对象仍然得到处理？

...that returns the value from within the using block, does the IDisposable object still get disposed?

推荐答案

是它。对象的处置发生在finally块，其执行甚至在回电话的脸。它本质上扩展到下面的代码

Yes it does. The disposing of the object occurs in a finally block which executes even in the face of a return call. It essentially expands out to the following code

var context = new linqAssignmentsDataContext();
try {
  return context.Persons.Where(p => p.LastName.Contans("dahl"));
} finally {
  if ( context != null ) {
    context.Dispose();
  }
}

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