[英]WPF Binding to converter for an Image (Bitmap) not showing
我在使用Converter從本地目錄創建圖像的WPF控件中無法顯示圖像時遇到問題。 我做錯了任何方向將不勝感激。
XAML
<UserControl x:Class="Coms.Views.ImageDetailView"
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"
xmlns:c="clr-namespace:Coms.Converter"
mc:Ignorable="d"
d:DesignHeight="100" d:DesignWidth="300" Background="Wheat">
<Control.Resources>
<c:ImageDetailConverter x:Key="converter" />
</Control.Resources>
<ListBox ItemsSource="{Binding icList}" ScrollViewer.HorizontalScrollBarVisibility="Disabled" ScrollViewer.VerticalScrollBarVisibility="Auto">
<ListBox.ItemTemplate>
<DataTemplate>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="100"/>
<ColumnDefinition Width="200"/>
</Grid.ColumnDefinitions>
<Image Name="imgBox" Width="auto" Height="auto" Grid.Column="0" Source="{Binding Converter={StaticResource converter}}" />
<TextBlock Name="txtBlock2" Grid.Column="1" Text="{Binding coordinates}"/>
</Grid>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
類
public class ImageDetail
{
public string fileName { get; set; }
public string coordinates { get; set; }
}
變流器
public class ImageDetailConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
IRuntimeConfigurations configs = ServiceLocator.Current.GetInstance<IRuntimeConfigurations>();
return new Bitmap(Image.FromFile(Path.Combine(configs.rootImagePath, ((IImageDetail)value).fileName)));
}
}
您的轉換器返回System.Drawing.Bitmap
,它是WinForms,而不是WPF。
它應該返回WPF ImageSource
(例如BitmapImage
):
public object Convert(
object value, Type targetType, object parameter, CultureInfo culture)
{
var imageDetail = (ImageDetail)value;
var configs = ServiceLocator.Current.GetInstance<IRuntimeConfigurations>();
var path = Path.Combine(configs.rootImagePath, imageDetail.fileName);
var uri = new Uri(path, UriKind.RelativeOrAbsolute);
return new BitmapImage(uri);
}
還要注意,WPF提供了從Uri
和string
(包含有效URI)到ImageSource
內置類型轉換,因此您的轉換器還可以返回uri
或path
值。
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