WPF MVVM绑定控件与帮助器方法PDFTron PDFViewer

// ViewModel
public class MainViewModel : INotifyPropertyChanged
{
    private PDFDocument _document;
    public PDFDocument Document
    {
        get { return _document; }
        set
        {
            _document = value;
            OnPropertyChanged(nameof(Document));
        }
    }

    public ICommand LoadDocumentCommand { get; }

    public MainViewModel()
    {
        LoadDocumentCommand = new RelayCommand(LoadDocument);
    }

    private void LoadDocument()
    {
        // 使用帮助器方法加载PDF文档
        Document = PDFHelper.LoadDocument("path/to/pdf");
    }

    // INotifyPropertyChanged实现代码省略...

    // 帮助器方法
    public static class PDFHelper
    {
        public static PDFDocument LoadDocument(string filePath)
        {
            // 使用PDFTron API加载PDF文档
            return new PDFDocument(filePath);
        }
    }
}

// View
<Window>
    <Grid>
        <PDFTron:PDFViewCtrl Document="{Binding Document}" />
        <Button Content="Load Document" Command="{Binding LoadDocumentCommand}" />
    </Grid>
</Window>