【发布时间】：2021-10-19 16:39:43
【问题描述】：
我以Microsoft Docs import-media-from-a-device 为例，在 WPF 应用程序中使用 Windows Media Import API。我现在几乎让它工作了，但还没有让数据绑定工作来提供可导入项目的列表，所以对此的任何帮助将不胜感激。源码可以下载here.
XAML 主窗口
enter<Window x:Class="ImportProofOfConcept.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:ImportProofOfConcept"
mc:Ignorable="d"
Title="Media Import" Height="450" Width="800" Loaded="Window_Loaded">
<Grid Margin="6">
<Grid.RowDefinitions>
<RowDefinition Height="100" />
<RowDefinition Height="*"/>
<RowDefinition Height="50"/>
<RowDefinition Height="30"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<StackPanel Grid.ColumnSpan="3">
<Label Content="Select the required source to import photos and videos from and then select the required files and click OK."/>
<Label Content="Source:"/>
<ComboBox x:Name="CboSources" SelectionChanged="CboSources_SelectionChanged"/>
<Label Content="Files:"/>
</StackPanel>
<ListView Grid.Row="1" Grid.ColumnSpan="3" MinHeight="10" VerticalAlignment="Stretch" x:Name="fileListView"
HorizontalAlignment="Left" Margin="10,11,0,21"
Width="756"
BorderBrush="#FF858585"
BorderThickness="1"
ScrollViewer.VerticalScrollBarVisibility="Visible">
<ListView.ItemTemplate>
<DataTemplate>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="0.05*"/>
<ColumnDefinition Width="0.20*"/>
<ColumnDefinition Width="0.75*"/>
</Grid.ColumnDefinitions>
<CheckBox Grid.Column="0" IsChecked="{Binding IsSelected, Mode=TwoWay}" />
<Image Grid.Column="1" Source="{Binding Thumbnail}" Width="120" Height="120" Stretch="Uniform"/>
<TextBlock Grid.Column="2" Text="{Binding Name}" VerticalAlignment="Center" Margin="10,0"/>
</Grid>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
<Button Grid.Row="2" Grid.Column="1" Click="ButtonOK_Click" IsDefault="True" Margin="6">OK</Button>
<Button Grid.Row="2" Grid.Column="2" Click="ButtonCancel_Click" IsCancel="True" Margin="6">Cancel</Button>
<ProgressBar Grid.Row="3" Grid.ColumnSpan="3" x:Name="progressBar" SmallChange="0.01" LargeChange="0.1" Maximum="1"/>
</Grid>
private async void FindItems()
{
this.cts = new CancellationTokenSource();
try
{
this.importSession = this.importSource.CreateImportSession();
// Progress handler for FindItemsAsync
var progress = new Progress<uint>((result) =>
{
System.Diagnostics.Debug.WriteLine(String.Format("Found {0} Files", result.ToString()));
});
this.itemsResult =
await this.importSession.FindItemsAsync(PhotoImportContentTypeFilter.ImagesAndVideos, PhotoImportItemSelectionMode.SelectAll)
.AsTask(this.cts.Token, progress);
// GeneratorIncrementalLoadingClass is used to incrementally load items in the Listview view including thumbnails
this.itemsToImport = new GeneratorIncrementalLoadingClass<ImportableItemWrapper>(this.itemsResult.TotalCount,
(int index) =>
{
return new ImportableItemWrapper(this.itemsResult.FoundItems[index]);
});
// Set the items source for the ListView control
this.fileListView.ItemsSource = this.itemsToImport;
// Log the find results
if (this.itemsResult != null)
{
var findResultProperties = new System.Text.StringBuilder();
findResultProperties.AppendLine(String.Format("Photos\t\t\t : {0} \t\t Selected Photos\t\t: {1}", itemsResult.PhotosCount, itemsResult.SelectedPhotosCount));
findResultProperties.AppendLine(String.Format("Videos\t\t\t : {0} \t\t Selected Videos\t\t: {1}", itemsResult.VideosCount, itemsResult.SelectedVideosCount));
findResultProperties.AppendLine(String.Format("SideCars\t\t : {0} \t\t Selected Sidecars\t: {1}", itemsResult.SidecarsCount, itemsResult.SelectedSidecarsCount));
findResultProperties.AppendLine(String.Format("Siblings\t\t\t : {0} \t\t Selected Sibilings\t: {1} ", itemsResult.SiblingsCount, itemsResult.SelectedSiblingsCount));
findResultProperties.AppendLine(String.Format("Total Items Items\t : {0} \t\t Selected TotalCount \t: {1}", itemsResult.TotalCount, itemsResult.SelectedTotalCount));
System.Diagnostics.Debug.WriteLine(findResultProperties.ToString());
}
if (this.itemsResult.HasSucceeded)
{
// Update UI to indicate success
System.Diagnostics.Debug.WriteLine("FindItemsAsync succeeded.");
}
else
{
// Update UI to indicate that the operation did not complete
System.Diagnostics.Debug.WriteLine("FindItemsAsync did not succeed or was not completed.");
}
}
catch (Exception ex)
{
System.Diagnostics.Debug.WriteLine("Photo import find items operation failed. " + ex.Message);
}
this.cts = null;
}
【问题讨论】：
标签： wpf windows-runtime