在WPF项目中,我将Polyline控件绑定到类型为PointCollection的DependencyProperty。
点的坐标应来自硬件(它是物理疗法的力量板硬件)。
我在控制台应用程序中编写了一些代码来从端口com读取数据,它的工作原理是正确的。我应该使用的代码在我的WPF应用程序
代码:在WPF应用程序中与COM端口通信
public class Hardware
{
private SerialPort _serialPort;
public void TestData()
{
InitSerialPort();
Console.WriteLine("Send data:");
string input = string.Empty;
while (input != "exit")
{
Thread.Sleep(3000);
input = "~";
SendData(input);
}
}
private void SendData(string input)
{
if (!_serialPort.IsOpen)
_serialPort.Open();
_serialPort.Write(input);
Console.WriteLine("data '{0}' has been sent to serial port", input);
}
private void InitSerialPort()
{
_serialPort = new SerialPort("COM5", 9600, Parity.None, 8, StopBits.One)
{
Handshake = Handshake.None,
ReadTimeout = 500,
WriteTimeout = 500
};
_serialPort.DataReceived += SerialPortDataReceived;
_serialPort.Open();
return;
}
private void SerialPortDataReceived(object sender, SerialDataReceivedEventArgs e)
{
Thread.Sleep(2000);
var buffer = new byte[100];
double deltaV1 = ((buffer[1]*65535 + buffer[2]*255 + buffer[3])*5)/102400;
double X = (25.73*deltaV1) + (-4.27);
double Y = (25.61*deltaV1) + (-3.79);
Console.WriteLine("X: {0}; Y: {1}", X, Y);
}
}
在视图模型我必然折线的点集合:
internal class RadarViewModel : DependencyObject, INotifyPropertyChanged
{
public static readonly DependencyProperty PtsProperty =
DependencyProperty.Register("Pts", typeof (PointCollection), typeof (RadarViewModel),
new UIPropertyMetadata(new PointCollection()));
public PointCollection Pts
{
get { return (PointCollection) GetValue(PtsProperty); }
set { SetValue(PtsProperty, value); }
}
public void AddPoint()
{
var rnd = new Random();
Pts.Add(new Point(rnd.Next(90), rnd.Next(90)));
if (PropertyChanged != null)
PropertyChanged(this, new PropertyChangedEventArgs("Pts"));
}
}
现在我不知道我怎么能当更新PointCollection从COM端口读取数据以反映UI中硬件的最新变化。
我看过这样的一些文章: Dependency property getters and setters in multithreaded environment
我不知道如何在我的场景中实现。
我建议不要继承'DependencyObject'。创建一个基本的ViewModel类,它实现'INotifyPropertyChanged类 '而不是'PointCollection Pts'使用'ObservableCollection Pts' –
2012-02-28 22:52:00
@jberger谢谢,我会和如何从Com端口更新ObservableCollection? –
Shahin
2012-02-28 23:59:21