我在 Windows 窗体项目中有一个 WPF 用户控件,但我遇到了问题。每次我的应用程序崩溃,因为元素主机无法在用户控件中加载数据。
当我把它放在 WPF 项目中时,也会发生同样的事情。每隔一秒,我的应用程序就会正常启动。
知道可能是什么问题吗?这是我的用户控制代码:
<UserControl x:Class="Fleet_management.Info"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
mc:Ignorable="d" Height="492" Width="578">
<UserControl.Background>
<LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
<GradientStop Color="#FFE2E2E2" Offset="0" />
<GradientStop Color="White" Offset="1" />
</LinearGradientBrush>
</UserControl.Background>
<UserControl.Resources>
<XmlDataProvider x:Key="rssData" XPath="//item" Source="******" />
</UserControl.Resources>
<Grid Margin="3" Height="598" Width="565">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="252*" />
<ColumnDefinition Width="90*" />
<ColumnDefinition Width="223*" />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="177*" />
<RowDefinition Height="55*" />
<RowDefinition Height="122*" />
<RowDefinition Height="177*" />
</Grid.RowDefinitions>
<ListBox x:Name="lstItems" Margin="3,0" ItemsSource="{Binding Source={StaticResource rssData}}"
SelectedIndex="0" VerticalAlignment="Stretch" FontStretch="Normal" FontSize="14" FontFamily="Lucida Sans Unicode" Grid.ColumnSpan="3">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<Image Width="20" Margin="3" Source="{Binding XPath=enclosure/@url}" />
<TextBlock Margin="3" VerticalAlignment="Center" Text="{Binding XPath=title}" FontWeight="Bold" />
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
<StackPanel Grid.Row="1" Orientation="Vertical" DataContext="{Binding ElementName=lstItems, Path=SelectedItem}" Margin="0,0,0,5" Grid.ColumnSpan="3">
<TextBlock Margin="3" FontSize="13" FontWeight="Bold" Text="{Binding XPath=title, Path=InnerText}" />
<TextBlock Margin="3" Opacity="0.72" Text="{Binding XPath=pubDate}" />
</StackPanel>
<ScrollViewer CanContentScroll="True" Grid.Row="2" HorizontalScrollBarVisibility="Disabled" VerticalScrollBarVisibility="Auto" DataContext="{Binding ElementName=lstItems, Path=SelectedItem}" Margin="0,0,3,115" Grid.RowSpan="2" Grid.ColumnSpan="3">
<TextBlock Margin="3"
FontStyle="Italic" Text="{Binding XPath=description, Path=InnerText}" TextWrapping="Wrap" TextAlignment="Justify" AllowDrop="False"
Foreground="#FF0000E7" FontFamily="Lucida Sans Unicode" FontSize="14" Padding="0,0,5,0" VerticalAlignment="Center" />
</ScrollViewer>
</Grid>
</UserControl>