如何通过将扩展方法替换为等效的.NET 2.0来将这段代码更改为.NET 2.0兼容?
public interface IMessagingService {
void sendMessage(object msg);
}
public interface IServiceLocator {
object GetService(Type serviceType);
}
public static class ServiceLocatorExtenstions {
//.NET 3.5 or later extension method, .NET 2 or earlier doesn't like it
public static T GetService<T>(this IServiceLocator loc) {
return (T)loc.GetService(typeof(T));
}
}
public class MessagingServiceX : IMessagingService {
public void sendMessage(object msg) {
// do something
}
}
public class ServiceLocatorY : IServiceLocator {
public object GetService(Type serviceType) {
return null; // do something
}
}
public class NotificationSystem {
private IMessagingService svc;
public NotificationSystem(IServiceLocator loc) {
svc = loc.GetService<IMessagingService>();
}
}
public class MainClass {
public void DoWork() {
var sly = new ServiceLocatorY();
var ntf = new NotificationSystem(sly);
}
}
非常感谢你。
最佳答案
只需从扩展方法中删除this
关键字即可。
public static class ServiceLocatorExtensions
{
public static T GetService<T>(IServiceLocator loc) {
return (T)loc.GetService(typeof(T));
}
}
并通过传递您要“扩展”的对象实例,将其作为其他任何静态方法调用:
IServiceLocator loc = GetServiceLocator();
Foo foo = ServiceLocatorExtensions.GetService<Foo>(loc);
实际上,这就是.Net 3.5编译器在后台执行的操作。顺便说一句后缀
Extensions
您也可以删除。例如。使用Helper
不要混淆别人。
关于c# - .NET 2.0等效于C#扩展方法,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/10410501/