设置长度属性时,Code Behind中的WPF DataTemplate崩溃

Question

我有以下代码:

    protected override DataTemplate _CreateDataTemplate()
    {
        DataTemplate dataTemplate = new DataTemplate();
        FrameworkElementFactory factory = new FrameworkElementFactory(typeof(DockPanel));
        factory.SetBinding(Panel.BackgroundProperty, new Binding(CellContentBindingPath.Replace(".ValueUser", ".Background")));
        dataTemplate.VisualTree = factory;
        var childFactory = new FrameworkElementFactory(typeof(Image));
        childFactory.SetValue(FrameworkElement.WidthProperty, 15);
        factory.AppendChild(childFactory);

        childFactory = new FrameworkElementFactory(typeof(TextBlock));
        factory.AppendChild(new FrameworkElementFactory(""));
        childFactory.SetBinding(TextBlock.TextProperty, !ShowZero ? new Binding(CellContentBindingPath)
                                                                   {
                                                                       Converter = new ValueToNothingConverter()
                                                                   } : new Binding(CellContentBindingPath));
        childFactory.SetValue(FrameworkElement.HorizontalAlignmentProperty, ContentAlignment);

        factory.AppendChild(childFactory);
        return dataTemplate;
    }

错误是"15不是属性宽度的有效值".

当我没有设置图像的宽度一切正常.不幸的是,宽度非常重要.

对不起代码格式错误,我没有发现如何使其格式化.

Answer 1

该FrameworkElement.Width属性的类型为double,但您尝试将其设置为整数值.

相反,将其写为以下之一:

childFactory.SetValue(FrameworkElement.WidthProperty, 15.0);
childFactory.SetValue(FrameworkElement.WidthProperty, 15d);
childFactory.SetValue(FrameworkElement.WidthProperty, 15D);