如果未连接到网络，如何在设备上存储信息 [英] How to store information on the device if not connected to a network
问题描述
您好，
我正在使用raspberry pi创建一个数据采集系统，将测量的传感器值添加到缓冲区（类型列表）并将信息写入每隔x秒清除缓冲区之前的SQL Server数据库（使用WPF服务）。我目前正在努力保持连接，而在某些时候运行这个应用程序。我想用某种方法来检查我是否已连接到网络。如果我是，我想在清除之前将缓冲区写入数据库。如果我没有连接，我想继续将
添加到缓冲区再次进行x秒的迭代。
I'm working with the raspberry pi to create a Data Acquisition system that Adds measured sensor values to a buffer (type List) and writes the information to a SQL Server database (using a WPF service) before clearing the buffer every x seconds. I'm currently struggling to stay connected while running this App some of the time. I want some way to check if I'm connected to the network. If I am, I want to be write the buffer to the database before clearing it. If I'm not connected, I would like to continue to add to the buffer for another iteration of x seconds before checking again.
public override void ProcessData(float value)
{
//将传感器测量值添加到缓冲区
dataBuffer.Add（new SensorService.RawDataValue（）{TimeStamp = DateTime 。现在，值=值}）;
//Add sensors measured value to buffer dataBuffer.Add(new SensorService.RawDataValue() { TimeStamp = DateTime.Now, Value = value });
//如果是时候写缓冲区
if（（LastWriteTime.AddSeconds（DataOutputSeconds）< DateTime.Now））//如果数据缓冲区足够大，发送到服务
{
//If it is time to write the buffer if ((LastWriteTime.AddSeconds(DataOutputSeconds) < DateTime.Now))//If data buffer is big enough, send to service {
SensorService.DataServiceClient client = new SensorService.DataServiceClient（）; //启动新客户端
SensorService.RawData rawData =新的SensorService.RawData（）;
rawData.SensorID = this.ParentSensor.SensorID;
rawData.ProgramID = this.ProgramID;
rawData.SensorName = this.ParentSensor.SensorName;
rawData.deviceID = this.ParentSensor.DeviceID;
rawData.ProgramName = this.ProgramName;
rawData.RawDataValues = new ObservableCollection< SensorService.RawDataValue>（dataBuffer as List< SensorService.RawDataValue>）; //将整个缓冲区发送到客户端
client.SendRawDataAsync（rawData）;
SensorService.DataServiceClient client = new SensorService.DataServiceClient();//start new client SensorService.RawData rawData = new SensorService.RawData(); rawData.SensorID = this.ParentSensor.SensorID; rawData.ProgramID = this.ProgramID; rawData.SensorName = this.ParentSensor.SensorName; rawData.deviceID = this.ParentSensor.DeviceID; rawData.ProgramName = this.ProgramName; rawData.RawDataValues = new ObservableCollection<SensorService.RawDataValue>(dataBuffer as List<SensorService.RawDataValue>);//send entire buffer to client client.SendRawDataAsync(rawData);
//设置上次写入到现在
LastWriteTime = DateTime.Now;
//set last write to to now LastWriteTime = DateTime.Now;
//清除数据缓冲区
dataBuffer.Clear（）;
//client.CloseAsync（）;
}
//clear data buffer dataBuffer.Clear(); //client.CloseAsync(); }
推荐答案
hi
似乎标题没有反映内容
基于标题你似乎想知道如何在Windows 10 IoT核心设备上存储数据，答案可能是SQLite，但基于您搜索网络可用性检查的内容
based on the title it seems you want to know how to store data on a Windows 10 IoT Core device, the answer could be SQLite but based on the content you search for a network availability check
NetworkInformation 提供对网络连接信息的访问
https://docs.microsoft.com/en-us/uwp/api/windows。 networking.connectivity.networkinformation
NetworkInformation provides access to network connection information https://docs.microsoft.com/en-us/uwp/api/windows.networking.connectivity.networkinformation
IoT核心默认应用（ https://github.com/Microsoft/Windows-iotcore-samples/tree/develop/Samples/IoTCoreDefaultApp ）以及本教程
< a href ="http://windowsapptutorials.com/windows-10/how-to -check-for-network-availability-in-universal-windows-apps /">
http://windowsapptutorials.com/windows-10/how-to-check-for-network-availability-in-universal -windows-apps / 显示其工作原理
the IoT Core Default App (https://github.com/Microsoft/Windows-iotcore-samples/tree/develop/Samples/IoTCoreDefaultApp) and also this tutorial http://windowsapptutorials.com/windows-10/how-to-check-for-network-availability-in-universal-windows-apps/ shows how it works
br
Andre
br
Andre
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