Question

我正在尝试实现一个winform应用程序，该应用程序在线图上显示一组样本（来自HW设备）。

我使用了INotifyPropertyChanged接口并将图表绑定到HW设备的模型，但似乎在HW模型中更改样本时图表不会更新。

很抱歉，如果这太基础了（我更像是一个嵌入式人员），但似乎我错过了将INotifyPropertyChanged事件连接到数据绑定器的部分。

这里缺少什么东西吗？或者我应该以不同的方式实施它？

在WinForm类中，我编写了以下代码将图表绑定到HW模型的示例按钮应该显示“ADCSamples＆＃39;变化：

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HW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

将其更改为已实施ObservableCollection的{{1}}：

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

IOnNotifyPropertyChanged

}

公共部分类Form1：表单 { 公共Form1（） { 的InitializeComponent（）; StreamChart.Series [0] .Points.DataBindY（GSWatch.ADCSamples）; }

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;
}

}

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更改为：

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

它会为你省去很多麻烦。

使用INotifyPropertyChanged接口

2 个答案: