Question

嗨，我完全是WPF的新手，我希望能够通过CS文件中的变量控制XAML中任何内容的边距值，我已经阅读了几个问题/ stackoverflow上的答案，试图实现它，但它似乎工作。

这是我到目前为止所尝试过的，但我无法以某种方式让它工作，真的需要就此提出建议。

public partial class MainWindow : Window, INotifyPropertyChanged
{
   private Thickness _Margin = new Thickness(100, 20, 0, 0);

   public Thickness Margin
   {
       get { return _Margin; }
       set
       {
           _Margin = value;
           //Notify the binding that the value has changed.
           this.OnPropertyChanged("Margin");
       }
   }
    public MainWindow()
    {
        InitializeComponent();

        No.DataContext = _Margin;
    }

    protected void OnPropertyChanged(string strPropertyName)
    {
        if (PropertyChanged != null)
            PropertyChanged(this, new PropertyChangedEventArgs(strPropertyName));
    }

    public event PropertyChangedEventHandler PropertyChanged;
}

XAML：

<Window x:Class="WpfApplication1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
<Grid Name="No">
    <Border BorderBrush="Silver" BorderThickness="1" Height="100" HorizontalAlignment="Left" Margin="{Binding _Margin}" Name="border1" VerticalAlignment="Top" Width="200" />
</Grid>
</Window>

Answer 1

属性名称＆＃34;公共厚度保证金＆＃34;存在问题。你使用它是覆盖Window.Margin属性，你应该重命名它。其次，您绑定的是成员值而不是属性值。

试试这段代码（我添加了一个触发PropertyChanged事件的按钮，无论你想使用什么，都应该替换它）：

public partial class MainWindow : Window, INotifyPropertyChanged
{
    private Thickness _margin = new Thickness(100, 20, 0, 0);

    public Thickness GridMargin
    {
        get { return _margin; }
        set
        {
            _margin = value;
            //Notify the binding that the value has changed.
            this.OnPropertyChanged("GridMargin");
        }
    }

    public MainWindow()
    {
        InitializeComponent();

        No.DataContext = this;
    }

    protected void OnPropertyChanged(string strPropertyName)
    {
        if (PropertyChanged != null)
            PropertyChanged(this, new PropertyChangedEventArgs(strPropertyName));
    }

    #region INotifyPropertyChanged Members

    public event PropertyChangedEventHandler PropertyChanged;

    #endregion

    private void ButtonBase_OnClick(object sender, RoutedEventArgs e)
    {
        Random r = new Random();
        GridMargin = new Thickness(r.Next(0, 100));
    }
}

XAML：

<Grid Name="No">
    <Border BorderBrush="Silver" BorderThickness="1" Height="100" HorizontalAlignment="Left" Margin="{Binding GridMargin}" Name="border1" VerticalAlignment="Top" Width="200" />

    <Button Content="Margin" HorizontalAlignment="Right" VerticalAlignment="Bottom" Click="ButtonBase_OnClick"></Button>
</Grid>

Answer 2

您设置数据上下文的方式不一致。 DataContext被设置为“MainWindow”的“_Margin”属性，但绑定也是以“_Margin”为目标。你需要这个：

No.DataContext = this;

通过控制边距移动图像

2 个答案: