Question

我想使用＆＃34; BluetoothLEAdvertisementWatcher＆＃34;在WCF服务中

public override void StartWathchingAsync()
        {
            BluetoothLEAdvertisementWatcher BluetoothWatcher = new BluetoothLEAdvertisementWatcher();
        }

但是当我创建＆＃34; BluetoothLEAdvertisementWatcher＆＃34;的实例时我收到以下错误

Error Image

类型＆System; Service.ServiceModel.FaultException`1＆＃39;的未处理异常发生在mscorlib.dll

其他信息：参数不正确。（例外   HRESULT：0x80070057（E_INVALIDARG））

ExceptionDetail，可能由。创建   IncludeExceptionDetailInFaults = true，其值为：   System.ArgumentException：参数不正确。（例外   HRESULT：0x80070057（E_INVALIDARG））at   MeasuringDeviceService.MeasuringDeviceClasseis.XiaomiMiScale.StartWathchingAsync（）   在MeasuringDeviceService.DeviceService.GetData（MeasuringDevice   measuringDevice）在C：\ Users \ Programmer \ Desktop \ Project中   MahdKodak \ MahdKodak \ MeasuringDeviceService \ DeviceService.svc.cs：行   37点   MeasuringDeviceService.DeviceService.GetDataXiaomiMiScale（XiaomiMiScale   xiaomiMiScale）在C：\ Users \ Programmer \ Desktop \ Project中   MahdKodak \ MahdKodak \ MeasuringDeviceService \ DeviceService.svc.cs：行   25在SyncInvokeGetDataXiaomiMiScale（Object，Object []，Object []）   在System.ServiceModel.Dispatcher.SyncMethodInvoker.Invoke（Object   实例，对象[]输入，对象[]＆amp;输出）   System.ServiceModel.Dispatcher.DispatchOperationRuntime.InvokeBegin（MessageRpc＆安培;   rpc）at   System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage5（MessageRpc＆安培;   rpc）at   System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage41（MessageRpc＆安培;   rpc）at   System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage4（MessageRpc＆安培;   rpc）at   System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage31（MessageRpc＆安培;   rpc）at   System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage3（MessageRpc＆安培;   rpc）at   System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage2（MessageRpc＆安培;   rpc）at   System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage11（MessageRpc＆安培;   rpc）at   System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage1（MessageRpc＆安培;   rpc）at System.ServiceModel.Dispatcher.MessageRpc.Process（Boolean   isOperationContextSet）

当我评论下面的代码行时，我的程序运作良好

//BluetoothLEAdvertisementWatcher BluetoothWatcher = new BluetoothLEAdvertisementWatcher();

编辑：

这是我的代码

服务代码：

public class DeviceService : IDeviceService
    {
        Semaphore DeviceSemaphor = null;
        public DeviceService()
        {
            DeviceSemaphor = new Semaphore(1, 1);
        }
        public XiaomiMiScaleData GetDataXiaomiMiScale(XiaomiMiScale xiaomiMiScale)
        {
            return GetData(xiaomiMiScale) as XiaomiMiScaleData;
        }

        public MeasuringDeviceData GetData(MeasuringDevice measuringDevice)
        {
            try
            {
                measuringDevice.StartWathchingAsync();
                return measuringDevice.LastData;
            }
            catch (Exception ex)
            {
                return null;
            }
        }
    }

其他课程：

[DataContract]
    public class MeasuringDevice
    {
        [DataMember]
        public MeasuringDeviceData LastData { get; set; }
        public MeasuringDevice()
        {
        }
        [DataMember]
        public ulong DeviceBluetoothAddress { get; set; }
        public virtual void StartWathchingAsync()
        {

        }
    }

[DataContract]
    public class XiaomiMiScale : MeasuringDevice
    {
        public XiaomiMiScale()
        {
            LastData = new XiaomiMiScaleData();
        }

        public override void StartWathchingAsync()
        {
            BluetoothLEAdvertisementWatcher BluetoothWatcher = new BluetoothLEAdvertisementWatcher();
        }
    }

Answer 1

问题出在MeasuringDeviceService.MeasuringDeviceClasseis.XiaomiMiScale.StartWathchingAsync（）或者MeasureDeviceService.DeviceService.GetData（MeasuringDevice measuringDevice）中导致异常被抛出的地方。

您在堆栈中看到WCF的原因是因为上面的代码正在WCF服务中执行，并且当错误发生时，异常将通过FaultException发送回客户端。

我不知道您的代码或系统，但我的第一个猜测是您需要弄清楚DeviceService.GetData（）的作用以及如何让它以独立的方式工作。

编辑：尝试运行BluetoothLEAdvertisementWatcher BluetoothWatcher = new BluetoothLEAdvertisementWatcher（）;在WCF领域之外的独立方法中调用。

当你这样做时，它是否按预期工作？你能在服务器端放一个断点，看看究竟抛出了什么异常并粘贴了callstack吗？

C＃ - 在WCF服务中使用Windows.winmd

1 个答案: