c# - 绑定(bind)后台时"Must create DependencySource on same Thread as the DependencyObject."

Question

我想更改 Backgroundworker 中数据网格的标签和背景。我有这样的网格:

<Grid HorizontalAlignment="Center" Height="499" Margin="96,170,810,0" VerticalAlignment="Top" Width="486" Background="{Binding aBackGround}">
    <Label Content="212" FontSize="100"  HorizontalAlignment="Left" VerticalAlignment="Top" RenderTransformOrigin="-4.395,-11.154" Margin="173,22,0,0" Height="123" Width="178"/>
    <Label Content="{Binding aPace}" FontSize="65"  HorizontalAlignment="Left" VerticalAlignment="Top" Margin="23,202,0,0" Height="84" Width="255"/>
</Grid>

在后面的代码中，我有一个 BackGround 和 aPace，如下所示:

private Brush _aBackGround;
private string _apace;

public Brush aBackGround
{
    get { return _aBackGround; }
    set
    {
        _aBackGround= value;
        RaisePropertyChanged(() => this.aBackGround);    
    }
}

public string aPace
{
    get { return _apace; }
    set
    {
        _apace = value;
        RaisePropertyChanged(() => this.aPace);
    }
}

我可以正确地看到 aPace 的结果，但一秒钟后我得到了

Must create DependencySource on same Thread as the DependencyObject

异常。你能告诉我如何解决吗？谢谢。

Answer 1

无论什么代码直接访问您的 UI，您都只能在 UI 线程上运行。使用调度程序在那里运行它，例如:

Application.Current.Dispatcher.Invoke(() =>
{
    // the code that's accessing UI properties
});