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我试图绘制使用Modbus命令读取的实时温度。目前,我可以读取温度并绘制图表。但是,一旦绘制出第一点,它就不会持续更新图形和GUI。C#在Windows窗体应用程序中实时绘图
我应该在Form1_Load
以外的方法中运行这个吗?
private void Form1_Load(object sender, EventArgs e)
{
chart1.ChartAreas.Add("Area");
chart1.ChartAreas["Area"].AxisX.Minimum = -100;
chart1.ChartAreas["Area"].AxisX.Maximum = 100;
chart1.ChartAreas["Area"].AxisX.Interval = 1;
chart1.ChartAreas["Area"].AxisY.Minimum = -100;
chart1.ChartAreas["Area"].AxisY.Maximum = 100;
chart1.ChartAreas["Area"].AxisY.Interval = 1;
//create a Data object array
val[] data = new val[5];
string[] ports = SerialPort.GetPortNames();
this.comboBox1.DataSource = ports;
serialPort1.PortName = "COM5";
using (SerialPort port = new SerialPort("COM5"))
{
//start time object
DateTime start = DateTime.Now;
int startSec = start.Second;
port.Open();
byte slaveID = 1;
ushort startAddress = 360;
ushort numOfPoints = 2;
ModbusSerialMaster master = ModbusSerialMaster.CreateRtu(port);
for (int j = 0; j < 5; j++)
{
ushort[] holding_register = master.ReadHoldingRegisters(slaveID, startAddress,
numOfPoints);
ushort val1 = holding_register[0];
ushort val2 = holding_register[1];
uint t1 = (uint)(holding_register[0]);
uint t2 = (uint)(holding_register[1] << 16);
uint temp = (uint)(t1) | (t2);
byte[] floatVals = BitConverter.GetBytes(temp);
float f = BitConverter.ToSingle(floatVals, 0);
c = 5.0/9.0 * (f - 32);
textBox1.Text = c.ToString();
DateTime current = DateTime.Now;
int currentSec = current.Second;
int time = currentSec - startSec;
chart1.Refresh();
data[j].time = time;
data[j].temperature = c;
chart1.Series[j].Points.Add(new DataPoint(data[j].time, data[j].temperature));
chart1.Refresh();
port.Close();
}
}
}
这是一个经典的newb问题。在任何窗口应用程序中都有一个指定的UI线程。它运行一个消息泵(处理用户点击窗口时的东西),并负责绘制窗口的可视化表示。你正在UI线程中工作。通常情况下,没关系,但是当您在UI线程中执行大量工作时,UI线程不能再运行消息泵或绘制窗口。您的应用程序似乎冻结,只有在完成后才进行更新。这就是为什么我们在*后台线程上做了大量工作并且转换到UI线程来发布更新。 – Will
像https://stuff.seans.com/2009/05/21/net-basics-do-work-in-background-thread-to-keep-gui-responsive/或类似的搜索结果的资源吨。 – Will
你的循环在哪里? – TaW