使用 INotifyPropertyChanged 接口绑定 Winform 图表

Question

我正在尝试实现一个 winform 应用程序，它在折线图上显示一组样本（来自硬件设备）。

我使用了 INotifyPropertyChanged 接口并将图表绑定到硬件设备的模型，但是在硬件模型处更改样本时，图表似乎没有更新。

对不起，如果这太基本了（我更像是一个嵌入式的人），但似乎我缺少将 INotifyPropertyChanged 事件连接到数据绑定器的部分。

这里有什么遗漏吗？还是我应该以不同的方式实现它？

在 WinForm 类中，我编写了以下代码来将图表绑定到 HW 模型的示例 当 'ADCSamples' 发生变化时，按钮应显示大小写：

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
        StreamChart.Series[0].Points.DataBindY(GSWatch.ADCSamples);
    }

    private GSWatchModel GSWatch = new GSWatchModel();

    private void button1_Click(object sender, EventArgs e)
    {
        uint[] muki = new uint[128];
        for (int i = 0; i < 128; i++)
        {
            muki[i] = (uint)(i / 10);
        }

        GSWatch.ADCSamples = muki;
        //StreamChart.Series[0].Points.DataBindY(GSWatch.ADCSamples);   //The chart is only updated if this line is executed
    }

    private void button2_Click(object sender, EventArgs e)
    {
        GSWatch.StartStreamADC();
        //StreamChart.Series[0].Points.DataBindY(GSWatch.ADCSamples);   //The chart is only updated if this line is executed
    }
}

在硬件模型中，我编写了以下代码来实现 INotifyPropertyChanged 功能：

    public class GSWatchModel : INotifyPropertyChanged
    {
    public event PropertyChangedEventHandler PropertyChanged;
    private void NotifyPropertyChanged([CallerMemberName] String propertyName = "")
    {
        if (PropertyChanged != null)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }
    }

    private uint[] aDCSamples = new uint[128];

    public uint[] ADCSamples
    {
        get
        {
            return aDCSamples;
        }

        set
        {
            aDCSamples = value;
            NotifyPropertyChanged();
        }
    }

    public GSWatchModel()
    {
        CommLink = new GSCommManager();
        for (int i = 0; i < 128; i++)
        {
            aDCSamples[i] = (uint)(i);      //initial values for demo
        }
    }

    uint muki = 0;
    public void StartStreamADC()
    {
        GSPacket StreamRequestPacket = new GSPacket(GSPTypes.Stream);
        CommLink.SendViaGSWatchLink(StreamRequestPacket);

        for (int i = 0; i < 128; i++)
        {
            aDCSamples[i] = (uint)i / 10;   //steps for demonstration
        }
        NotifyPropertyChanged();
        muki += 100;
    }
}

Answer 1

在绑定之前移动StartStreamADC...见下文：

    private void Form1_Load(object sender, EventArgs e)
    {
        GSWatchModel GSWatch = new GSWatchModel();
        GSWatch.StartStreamADC();

        StreamChart.Series[0].Points.DataBindY(GSWatch.ADCSamples);
    }

结果：

为了获得通知，请执行以下操作：

    private void Form1_Load(object sender, EventArgs e)
    {
        GSWatch = new GSWatchModel();
        GSWatch.StartStreamADC();

        StreamChart.Series[0].Points.DataBindY(GSWatch.ADCSamples);

        GSWatch.PropertyChanged += GSWatch_PropertyChanged;

    }

    private void GSWatch_PropertyChanged(object sender, PropertyChangedEventArgs e)
    {
        StreamChart.Series[0].Points.DataBindY(GSWatch.ADCSamples);
    }

另外，请将ADCSamples 更改为：

        public List<uint> ADCSamples = new List<uint>();

这样可以省去很多麻烦。

Answer 2

ADCSamples 根本没有实现 IOnNotifyPropertyChanged。

你可以：

• 将其更改为索引器属性并正确实现IOnNotifyPropertyChangedPropertyChanged for indexer property

• 将其更改为已实现 IOnNotifyPropertyChanged 的 ObservableCollection：

  公共类 GSWatchModel：INotifyPropertyChanged { 公共事件 PropertyChangedEventHandler PropertyChanged； 私人无效NotifyPropertyChanged（[CallerMemberName] String propertyName =“”） { if (PropertyChanged != null) { PropertyChanged(this, new PropertyChangedEventArgs(propertyName)); } }

  private ObservableCollection<uint> aDCSamples = new ObservableCollection<uint>();
  public ObservableCollection<uint> ADCSamples
  {
      get
      {
          return aDCSamples;
      }
  
      set
      {
          aDCSamples = value;
          NotifyPropertyChanged("ADCSamples");
      }
  }
  
  public GSWatchModel()
  {
      CommLink = new GSCommManager();
  
      for (int i = 0; i < 128; i++)
      {
          ADCSamples.Add((uint)(i));      //initial values for demo
      }
  }
  
  uint muki = 0;
  public void StartStreamADC()
  {
      GSPacket StreamRequestPacket = new GSPacket(GSPTypes.Stream);
      CommLink.SendViaGSWatchLink(StreamRequestPacket);
  
      for (int i = 0; i < 128; i++)
      {
          ADCSamples[i] = (uint)i / 10;   //steps for demonstration
      }
  
      muki += 100;
  }
  

  }

  公共部分类 Form1 : Form { 公共表格1（） { 初始化组件（）； StreamChart.Series[0].Points.DataBindY(GSWatch.ADCSamples); }

  private GSWatchModel GSWatch = new GSWatchModel();
  
  private void button2_Click(object sender, EventArgs e)
  {
      GSWatch.StartStreamADC();
  }
  

  }