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，该应用程序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 HW 设备的模型，但是当在 HW 模型上更改示例时图表似乎没有更新。

抱歉，如果这太基础了（我更像是一个嵌入式的人），但我似乎遗漏了将 INotifyPropertyChanged 事件连接到数据绑定器的部分。

这里是不是少了什么？还是我应该以不同的方式实施？

在 WinForm class 我编写了以下代码将图表绑定到 HW 模型的示例当 'ADCSamples' 更改时，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

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施 IOnNotifyPropertyChanged PropertyChanged for indexer property

将其更改为 ObservableCollection 已经实现了 IOnNotifyPropertyChanged:

public class GSWatchModel：INotifyPropertyChanged { public 事件 PropertyChangedEventHandler PropertyChanged； private void NotifyPropertyChanged([CallerMemberName] String 属性Name = "") { 如果（PropertyChanged！= null） { PropertyChanged（这个，新的 PropertyChangedEventArgs（属性Name））； } }

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;
}

}

public 部分 class Form1 : 表格 { public 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();
}

}

Answer 2

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：

要获得通知，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改为：

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

它会让你省去很多麻烦。

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