延迟加载和加载()的区别是什么?

在EntityFramework4中,延迟加载和使用load()方法有什么区别?

编辑:我已经添加了两个“if”语句:

延迟加载:

var query = from c in context.Contacts select c;
foreach ( var contact in query ) {
     if ( contact.ID == 5 )
        Console.WriteLine( contact.Addresses.City );
}

加载()方法:

context.ContextOptions.LazyLoadingEnabled = false;

var query = from c in context.Contacts select c;
foreach ( var contact in query ) {
     if ( contact.ID == 5 ) {
        contact.Addresses.Load()
        Console.WriteLine( contact.Addresses.City );
     }
}

现在,有了这两张“如果”支票,我为什么要先付一张呢?