为什么图像转换器没有显示在命名空间中?

Question

我正在尝试在不锁定图像文件的情况下在列表视图中加载几百张图像。我希望能够在程序运行时删除该文件。我创建了一个自定义图像转换器并将其绑定到列表视图。

但是，代码没有编译，我得到"命名空间"clr-namespace：CoolApp.ImageConverter"中不存在名称"图像转换器">

我做错了什么？

XAML：

<Window x:Class="CoolApp.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:CoolApp"
xmlns:c="clr-namespace:CoolApp.ImageConverter"
mc:Ignorable="d"
Title="MainWindow" MinHeight="600" Height="600" MinWidth="800" Width="800" 
Background="#FF222431" WindowStartupLocation="CenterScreen">
<Window.Resources>
<c:ImageConverter x:Key="ImgConverter" />
</Window.Resources>

<Grid Name="ThumbGrid" Grid.Row="1" Margin="10,10,0,0" >
<Grid.RowDefinitions>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<ListView x:Name="Thumbview" Grid.Row="0" BorderThickness="1" IsTextSearchEnabled="True" TextSearch.TextPath="{Binding title}" VirtualizingPanel.IsVirtualizingWhenGrouping="True" ScrollViewer.VerticalScrollBarVisibility="Auto" ScrollViewer.HorizontalScrollBarVisibility="Disabled" Background="{x:Null}" BorderBrush="{x:Null}" >
<ListView.ItemTemplate>
<DataTemplate>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="*"/>
<RowDefinition Height="*"/>
<RowDefinition />
</Grid.RowDefinitions>
<Image Name="Thumbnails" Grid.Row="0" Source="{Binding picPath, Converter={StaticResource ImgConverter}, IsAsync=True}" Stretch="Uniform" Height="255" Width="170" ToolTip="{Binding title}" HorizontalAlignment="Center" VerticalAlignment="Center">
</Image>
</Grid>               
</DataTemplate>
</ListView.ItemTemplate>
<ListView.ItemsPanel>
<ItemsPanelTemplate>
<WrapPanel Orientation="Horizontal"/>
</ItemsPanelTemplate>
</ListView.ItemsPanel>
</ListView>
</Grid>
</Window>

C#：

namespace CoolApp
{

public class ImageConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
var image = new BitmapImage();
image.BeginInit();
image.UriSource = value is Uri ? (Uri)value : new Uri(value.ToString());
image.CacheOption = BitmapCacheOption.OnLoad;
image.EndInit();
return image;
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
throw new NotImplementedException();
}
}
public partial class MainWindow : Window
{

public MainWindow()
{
InitializeComponent();
}
//code to add images to ItemsSource
}

Answer 1

当你告诉编译器在命名空间内查找CoolAppCoolApp.ImageConverterImageConverter时，你的ImageConverter是在命名空间内定义的因为 xaml 中的命名空间映射错误。 命名空间映射应如下所示：

xmlns:c="clr-namespace:CoolApp"