我正在尝试实现 WCF 回调。当我在服务端调用回调方法时,它会异步执行。有没有办法在服务方法进入下一条语句之前等待回调方法完成执行,而不从回调返回值给服务?
//Server Side
public interface ICallback
{
[OperationContract]
void Oncallback1(string str);
[OperationContract]
int Oncallback2(string str);
}
[ServiceContract(CallbackContract = typeof(ICallback))]
public interface IServiceContract
{
[OperationContract]
void Method1();
}
[ServiceBehavior(ConcurrencyMode = ConcurrencyMode.Reentrant)]
public class MycallbackService : IServiceContract
{
public void Method1()
{
ICallback objIcallback = OperationContext.Current.GetCallbackChannel<ICallback>();
Thread.Sleep(5000);
objIcallback.Oncallback1(obj1);
Console.WriteLine("calling callback2");
Console.WriteLine(objIcallback.Oncallback2("2"));
Console.WriteLine("Service Execution over!");
}
}
//Client Side
[CallbackBehavior]
public class callbackClient : ICallback
{
public void Oncallback1(CallbackService.EventInfo obj)
{
Thread.Sleep(5000);
Console.WriteLine("Callback 1");
}
public int Oncallback2(string str)
{
Thread.Sleep(5000);
Console.WriteLine("Callback 4");
return 2;
}
}
这里的语句“Console.WriteLine("calling callback2");” 在 callback1 方法完成之前执行。而它一直等到 callback2 完成。