2

我有一个动态数据透视项目模板，如下所示：

<controls:Pivot.ItemTemplate>
                <DataTemplate>
                    <ListBox ItemsSource="{Binding Articles}">
                        <ListBox.ItemTemplate>
                            <DataTemplate>
                                <local:DropPageSelector Content="{Binding}">
                                    <local:DropPageSelector.hasImage>
                                        <DataTemplate>
                                            <!--Code-->
                                        </DataTemplate>
                                    </local:DropPageSelector.hasImage>
                                    <local:DropPageSelector.noImage>
                                        <DataTemplate>
                                            <!--Code-->
                                        </DataTemplate>
                                    </local:DropPageSelector.noImage>
                                </local:DropPageSelector>
                            </DataTemplate>

                        </ListBox.ItemTemplate>

                    </ListBox>
                </DataTemplate>
            </controls:Pivot.ItemTemplate>
        </controls:Pivot>

这是我的 DropPageSelector 数据模板选择器类的代码：

class DropPageSelector : DataTemplateSelector
    {
        public DataTemplate noImage
        {
            get;
            set;
        }
        public DataTemplate hasImage
        {
            get;
            set;
        }

        public override DataTemplate SelectTemplate(object item, DependencyObject container)
        {
            News nws = item as News;
            if (nws != null) 
            { 
                if ( nws.Image != null || nws.Image =="" )
                {
                    return hasImage;
                }
                else 
                {
                    return noImage;
                }
            }
            return base.SelectTemplate(item, container);
        }
    }

但是当我尝试运行代码时，出现以下错误：

A first chance exception of type 'System.IO.FileNotFoundException' occurred in mscorlib.dll
A first chance exception of type 'MS.Internal.NativeParseException' occurred in System.Windows.dll
A first chance exception of type 'System.Exception' occurred in System.Windows.dll
An unhandled exception of type 'System.Exception' occurred in System.Windows.dll
Additional information: Unspecified error

有谁知道为什么会这样？

4

1 回答 1

1

解决了这个。问题是班级

class DropPageSelector : DataTemplateSelector

不公开。它应该是

public class DropPageSelector : DataTemplateSelector
于 2014-05-07T17:38:56.523 回答