WPF属性绑定到MVVM中的文本块？

Question

我有一个文本块，我想将其数据绑定到我的viewModel中的一个属性，我无法更新它，这是代码：

public partial class MainWindow : Window
{
    public MainWindow()
    {
        FurnaceDataViewModel viewModel = new FurnaceDataViewModel();
        InitializeComponent();
    }
}

。

class FurnaceDataViewModel: ObservableObject
{
    public FurnaceDataModel dataModel = new FurnaceDataModel();
    public SerialPort serialPort = new SerialPort();

    public FurnaceDataViewModel()
    {            
        serialPort = new SerialPort("COM3", 9600, Parity.None, 8, StopBits.One);
        try
        {
            if (serialPort.IsOpen != true)
                serialPort.Close();
            serialPort.Open();
            serialPort.DataReceived += new SerialDataReceivedEventHandler(serialReceivedData); 
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.ToString());
        }
    }

    public void serialReceivedData(object sender, SerialDataReceivedEventArgs e)
    {
        dataModel.IncomingMessage = serialPort.ReadExisting();            
    }
}

。

class FurnaceDataModel: ObservableObject
{
    public event PropertyChangedEventHandler PropertyChanged;

    private string incomingMessage;

    public string IncomingMessage
    {
        get { return incomingMessage; }
        set
        {
            incomingMessage = value;
            OnPropertyChanged("IncomingMessage");
        }
    }
}

。

<Window
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="clr-namespace:FurnaceData" x:Class="FurnaceData.MainWindow"
    Title="MainWindow" Height="350" Width="525">
<Grid>
    <TextBlock x:Name="tbkMain" HorizontalAlignment="Left" Height="292" Margin="10,10,0,0" TextWrapping="Wrap" Text="{Binding dataModel.IncomingMessage}" VerticalAlignment="Top" Width="489"/>
</Grid>

以及数据绑定后，如何用文本包装文本块？ 喜欢+ =有点东西？

Answer 1

我认为您需要设置数据上下文或设置一个objectDataProvider。

在构造函数中，尝试添加该行

DataContext = viewModel;

并将您的字段更改为属性

public class FurnaceDataViewModel
{
    public FurnaceDataModel dataModel { get; set; }

而且您应该看到文本换行，但是很难看到何时将文本块代码设置为绝对大小...试试看它换行

 <TextBlock x:Name="tbkMain" HorizontalAlignment="Stretch" VerticalAlignment="Stretch"  Margin="10,10,0,0" TextWrapping="Wrap" 
               Text="{Binding Path=dataModel.IncomingMessage}" />