如何将变量绑定到文本块 [英] How to bind a variable with a textblock

问题描述

我想知道如何将一个文本块绑定到我的C＃类中的一个变量。

I was wondering how I would be able to bind a text block to a variable within my C# class.

我的基本上是一个cart变量。 cs文件。在该购物车类中，我可以访问不同的总计。

Basically I have a "cart" variable in my .cs file. Within that Cart class I have access to the different totals.

以下是我用于绑定的，但它似乎并不绑定到变量...

The following is what I have for binding, but it does not seem to bind to the variable...

<StackPanel
   Width="Auto"
   Height="Auto"
   Grid.ColumnSpan="2"
   Grid.Row="5"
   HorizontalAlignment="Right">
   <TextBlock
      Name="Subtotal"
      FontFamily="Resources/#Charlemagne Std"
      FontSize="20"
      Text="{Binding ElementName=cart, Path=SubTotal}">
   </TextBlock>
   <TextBlock
      Name="Tax"
      FontFamily="Resources/#Charlemagne Std"
      FontSize="20"
      Text="{Binding ElementName=cart, Path=Tax}">
   </TextBlock>
   <TextBlock
      Name="Total"
      FontFamily="Resources/#Charlemagne Std"
      FontSize="20"
      Text="{Binding ElementName=cart, Path=Total}">
   </TextBlock>
</StackPanel>

正确的方法是什么？再次感谢您的帮助！

What is the correct way of doing it? Thanks again for the help!

推荐答案

如果您进一步希望文本框在您的购物车类更改时自动更新，您的课程必须实现 INotifyPropertyChanged 界面：

If you further want the TextBoxes to update automatically when your cart class changes, your class must implement the INotifyPropertyChanged interface:

class Cart : INotifyPropertyChanged 
{
    // property changed event
    public event PropertyChangedEventHandler PropertyChanged;

    private int _subTotal;
    private int _total;
    private int _tax;

    private void OnPropertyChanged(String property)
    {
        if (PropertyChanged != null)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(property));
        }
    }

    public int SubTotal
    {
        get
        {
            return _subTotal;
        }
        set
        {
            _subTotal = value;
            OnPropertyChanged("SubTotal");
        }
    }

    public int Total
    {
        get
        {
            return _total;
        }
        set
        {
            _total = value;
            OnPropertyChanged("Total");
        }
    }

    public int Tax
    {
        get
        {
            return _tax;
        }
        set
        {
            _tax = value;
            OnPropertyChanged("Tax");
        }
    }

}

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