如何判断SubmitChanges()是否会实际更改LINQ to SQL中特定实体的任何内容

int changes = dataContext.SubmitChanges();
if (changes > 0)
{
    Console.WriteLine("Changes submitted: {0}", changes);
}
else
{
    Console.WriteLine("No changes submitted");
}

if (entity.State == EntityState.Modified)
{
    Console.WriteLine("Entity has been modified");
}
else
{
    Console.WriteLine("Entity has not been modified");
}

entity.PropertyChanging += (sender, e) =>
{
    Console.WriteLine("Property {0} is changing", e.PropertyName);
};

entity.PropertyChanged += (sender, e) =>
{
    Console.WriteLine("Property {0} has been changed", e.PropertyName);
};