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我是Microsoft Azure IoT Hub的新成员。我想要获取IoT Hub中的设备列表,并检查列表中是否有设备。从Azure IoT Hub获取设备列表
它的工作很好,如果我使用控制台应用程序。
static async void QueryDevices()
{
registryManager = RegistryManager.CreateFromConnectionString(DeviceConnectionString);
var devices = await registryManager.GetDevicesAsync(100); // Time 1 sek
foreach (var item in devices)
{
Console.WriteLine("Divice id: " + item.Id + ", Connection state: " + item.ConnectionState);
}
Console.WriteLine("\nNumber of devices: " + devices.Count());
}
但是,如果使用“相同”的代码在的WebAPI的GetDevicesAsync()
保持运行,没有任何结果运行。
public bool CheckIoTHubConnection(string iotHubConnectionString)
{
registryManager = RegistryManager.CreateFromConnectionString(iotHubConnectionString);
return CreateConnection().Result;
}
private async Task<bool> CreateConnection()
{
bool connectionOk = false;
try
{
// Gets all devices from IoT Hub
var result = await registryManager.GetDevicesAsync(10); // This never gets further
if (result.Any())
connectionOk = true;
}
catch (Exception ex)
{
connectionOk = false;
throw ex;
}
return connectionOk;
}
我在做什么错?
感谢丽塔。现在它的工作很好 –