Question

public class RichTextBoxExtended : RichTextBox
{
    static RichTextBoxExtended()
    {
        //DefaultStyleKeyProperty.OverrideMetadata(typeof(RichTextBoxExtended), new FrameworkPropertyMetadata(typeof(RichTextBoxExtended)));
    }

    public byte[] Text
    {
        get { return (byte[])GetValue(TextProperty); }
        set { SetValue(TextProperty, value); }
    }

    // Using a DependencyProperty as the backing store for Text.  This enables animation, styling, binding, etc...
    public static readonly DependencyProperty TextProperty =
        DependencyProperty.Register("Text", typeof(byte[]), typeof(RichTextBoxExtended), new UIPropertyMetadata(null, new PropertyChangedCallback(TextChangedCallback)));

    private static void TextChangedCallback(DependencyObject obj, DependencyPropertyChangedEventArgs e)
    {
        RichTextBoxExtended richTextBoxExtended = obj as RichTextBoxExtended;
        richTextBoxExtended.ChangeText(e);
    }

    private void ChangeText(DependencyPropertyChangedEventArgs e)
    {
        //clear out any formatting properties
        TextRange range = new TextRange(base.Document.ContentStart, base.Document.ContentEnd);
        range.ClearAllProperties();

        //load bytes into stream, load stream into range
        MemoryStream stream = new MemoryStream(e.NewValue as byte[]);
        range.Load(stream, DataFormats.Rtf);
    }
}

以上是自定义控件...

XAML实施自定义控制......

<Grid>
    <controls:RichTextBoxExtended x:Name="Document" Text="{Binding Path=File}">
    </controls:RichTextBoxExtended>
</Grid>

相关虚拟机......

public class FileViewerViewModel : AViewModel
{
    private byte[] _file = null;

    public FileViewerViewModel(ILoggerFacade logger)
    {

    }

    /// <summary>
    /// Gets or sets the <seealso cref="DataFormats.Rtf"/> file representation as a <seealso cref="byte[]"/>
    /// </summary>
    public byte[] File
    {
        get 
        {
            return _file;
        }
        set 
        {
            _file = value;
            RaiseChanged(() => this.File);
        }
    }
}

最后..如果我打电话......

FileViewerView view = _container.Resolve<FileViewerView>();

失败了。

Resolution of the dependency failed, type = "cyos.infrastructure.Views.FileViewerView", name = "". Exception message is: The current build operation (build key Build Key[cyos.infrastructure.Views.FileViewerView, null]) failed: Object reference not set to an instance of an object. (Strategy type BuildPlanStrategy, index 3)

如果我从XAML中移除绑定......

<Grid> 
    <controls:RichTextBoxExtended x:Name="Document">
    </controls:RichTextBoxExtended>
</Grid>

一切顺利无故......没有任何问题......想法？

编辑：

切换到创建新实例，绕过Unity。问题仍然在同一个地方，在InitializeComponent（）构造FileViewerView时出现异常，“对象引用未设置为对象的实例。”

在System.Windows.Markup.BamlRecordReader.ProvideValueFromMarkupExtension（MarkupExtension markupExtension，Object obj，Object member）在System.Windows.Markup.BamlRecordReader.ReadPropertyArrayEndRecord（）在System.Windows.Markup.BamlRecordReader.ReadRecord（BamlRecord bamlRecord）在System.Windows.Markup.BamlRecordReader.Read（Boolean singleRecord）在System.Windows.Markup.TreeBuilderBamlTranslator.ParseFragment（）在System.Windows.Markup.TreeBuilder.Parse（）在System.Windows.Markup.XamlReader.LoadBaml（Stream stream，ParserContext parserContext，Object parent，Boolean closeStream）在System.Windows.Application.LoadComponent（对象组件，Uri resourceLocator）在c：\ Documents and Settings \ amciver \ My Documents \ dev \ cyos \ cyos \ cyos.infrastructure \ Views \ FileViewerView.xaml：line 1中的cyos.infrastructure.Views.FileViewerView.InitializeComponent（）现在在cyos.infrastructure.Views.FileViewerView..ctor（FileViewerViewModel viewModel）......

Answer 1

我不知道数组有什么问题，但List＆lt; byte＆gt;的工作原理。

使用Unity的自定义WPF控件无法解决

1 个答案: