我必须加载一个XAML文件,但由于它仅在STA线程的上下文中起作用,我必须启动一个新线程并将其公寓状态设置为STA。
加载控件后,我想用LogicalTreeHelper.GetChildren(...)获取所有逻辑子代。
此时我得到带有Message =的System.InvalidOperationException。调用线程无法访问此对象,因为另一个线程拥有它。
代码:
public partial class MainWindow : Window
{
private Thread STAThread = null;
/// <summary>
/// XAML path.
/// </summary>
private static string _selectedXAML = Path.GetFullPath( @"..\..\Resources\UserControl1.xaml" );
private FrameworkElement _loadedUI = null;
public MainWindow()
{
InitializeComponent();
}
private void MainWindow_OnLoaded( object sender, RoutedEventArgs e )
{
this.LoadUI();
DependencyObject depObj = _loadedUI as DependencyObject;
var s = LogicalTreeHelper.GetChildren( depObj );
}
private void LoadUI()
{
// Read the text as string from the file
var xamlText = File.ReadAllText( _selectedXAML );
// Replace variable values and script value pairs
StringReader stringReader = new StringReader( xamlText );
XmlReader xmlReader = XmlReader.Create( stringReader );
STAThread = new Thread(
() =>
{
_loadedUI = XamlReader.Load( xmlReader ) as FrameworkElement;
} );
STAThread.SetApartmentState( ApartmentState.STA );
STAThread.Start();
STAThread.Join();
}
}
那么如何更改对象的线程所有者?
在窗口对象上绑定调用任何Dispatcher的“Invoke”方法没有帮助。
答案 0 :(得分:0)
您无法更改拥有的主题。相反,您可以简化LoadUI
方法。
删除所有单独的线程并直接加载XAML,因为Join
调用将阻止您的UI线程,直到加载线程完成。
private FrameworkElement LoadUI()
{
// Read the text as string from the file
var xamlText = File.ReadAllText(_selectedXAML);
// Replace variable values and script value pairs
var stringReader = new StringReader(xamlText);
var xmlReader = XmlReader.Create(stringReader);
return XamlReader.Load(xmlReader) as FrameworkElement;
}
private void MainWindow_OnLoaded(object sender, RoutedEventArgs e)
{
var s = LogicalTreeHelper.GetChildren(LoadUI());
}