Develop Reference

Binding an image to ImageBrush

i am having an issue while trying to bind an image to an ImageSource. I have tried some of the other fix on stackoverflow but none of them works.
I seem to get an error on this line saying that collection "Items" must be empty.
ImageList.ItemsSource = List;
The bind works well while using the "url" member of the FlickrData class.
MainWindow.xaml
<ScrollViewer>
<ListView x:Name="ImageList" ScrollViewer.HorizontalScrollBarVisibility="Disabled">
<ListView.ItemsPanel>
<ItemsPanelTemplate>
<WrapPanel />
</ItemsPanelTemplate>
</ListView.ItemsPanel>
<Rectangle Margin="5" Width="100" Height="100">
<Rectangle.Fill>
<ImageBrush ImageSource="{Binding imageBinding}"/>
</Rectangle.Fill>
</Rectangle>
</ListView>
</ScrollViewer>
FlickrData Class:
public class FlickrData
{
public String url { get; set;}
public FlickrData(Photo photo)
{
url = photo.SmallUrl;
}
public ImageBrush imageBinding
{
get
{
ImageBrush brush = new ImageBrush();
brush.ImageSource = new BitmapImage(new Uri(url));
return brush;
}
}
}
MainWindow class:
public partial class MainWindow : Window
{
public ObservableCollection<FlickrData> List = new ObservableCollection<FlickrData>();
public static Flickr flickr = new Flickr("XXXXXXXXXXXXXX");
public MainWindow()
{
InitializeComponent();
}
public void SearchWithInput(object sender, RoutedEventArgs e)
{
var options = new PhotoSearchOptions { Tags = SearchInput.Text, PerPage = 20, Page = 1 };
PhotoCollection photos = flickr.PhotosSearch(options);
List.Clear();
foreach (Photo photo in photos)
{
String flickrUrl = photo.WebUrl;
Console.WriteLine("Photo {0} has title {1} with url {2}", photo.PhotoId, photo.Title, photo.WebUrl);
List.Add(new FlickrData(photo));
}
ImageList.ItemsSource = List;
}
}

Do this to clean up the process
Change your XAML's ListView to ItemsSource="{Binding List}" which only needs to be done once.
Remove the now redundant ImageList.ItemsSource = List;
The list control will update itself accordingly because an ObservableCollection sends notifications of the change which are subscribed to by the list control.

WPF: How to upload an image to your project and use it later on as a resource

I'm studying WPF at school but I ran into a problem with uploading a new image to my project.
The goal is to be able to add an image (at runtime) using a file browser. This image should be uploaded into the project and the filename should be saved in a database. Than it should be accessible as a resource in the project so I can show the image in a listbox for example.
This is what I've got so far:
View where the upload happens:
<Image Height="70px" Source="{Binding newImg}"/>
<Button Height="23" Name="btnLoad" VerticalAlignment="Bottom"
Width="75" Grid.Column="0" Grid.Row="1" Command="{Binding ImgUploadCommand}">_Browse</Button>
ViewModel UploadView
private string fullPath;
private BitmapImage image;
private Patient newPatient = new Patient();
private void KoppelenCommands()
{
FotoUploadCommand = new BaseCommand(FotoPatientUpload);
PatientOpslaanCommand = new BaseCommand(PatientOpslaan);
}
public ICommand FotoUploadCommand { get; set; }
public ICommand PatientOpslaanCommand { get; set; }
public void FotoPatientUpload()
{
OpenFileDialog op = new OpenFileDialog();
op.Title = "Select a picture";
op.Filter = "All supported graphics|*.jpg;*.jpeg;*.png|" +
"JPEG (*.jpg;*.jpeg)|*.jpg;*.jpeg|" +
"Portable Network Graphic (*.png)|*.png";
if (op.ShowDialog() == true)
{
image= new BitmapImage(new Uri(op.FileName));
fullPath = op.FileName;
string[] partsFileName = fullPath.Split('\\');
System.Windows.MessageBox.Show(delenFileName[(partsFileName.Length - 1)]);
NewPatient.Image= partsFileName[(delenFileName.Length - 1)];
}
}
public void PatientOpslaan()
{
string destinationPath = GetDestinationPath(NewPatient.Afbeelding, "\\assets\\images");
File.Copy(fullPath, destinationPath, true);
//dataservice (My DS works fine, I can see the correct filename in the database but I save only the name not the Path)
PatientDataService patientDS =
new PatientDataService();
patientDS.InsertPatient(NewPatient);
}
else
{
MessageBox.Show("Niet alle velden zijn ingevuld! Een nieuwe patient moet tenminste een naam en een voornaam krijgen!", "Fout!", MessageBoxButton.OK, MessageBoxImage.Error);
}
}
//opslaan foto in opgegeven map <<Code afkomstig van stackoverflow auteur: Yashpal Singla>>
private static String GetDestinationPath(string filename, string foldername)
{
String appStartPath = System.IO.Path.GetDirectoryName(Process.GetCurrentProcess().MainModule.FileName);
appStartPath = String.Format(appStartPath + "\\{0}\\" + filename, foldername);
return appStartPath;
}
The image is correctly saved to the bin/debug/assets/images folder but not as a resource. Because it isn't saved as a resource I can't use it in my MainWindow View which looks like this:
<ListBox HorizontalContentAlignment="Center" ItemsSource="{Binding Patienten}" SelectedItem="{Binding SelectedPatient}" Grid.Column="0" Grid.Row="0">
<ListBox.ItemTemplate>
<DataTemplate>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition></ColumnDefinition>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition></RowDefinition>
<RowDefinition></RowDefinition>
</Grid.RowDefinitions>
<TextBlock Name="ImageNameListBox" Visibility="Collapsed"
Text="{Binding Image, StringFormat=../assets/images/{0}}" />
<Border Style="{StaticResource imageBorderStyle}" Grid.Column="0" Grid.Row="0" Height="80px" Width="80px">
<Rectangle Margin="1,-2,-2,1" Height="80px" Width="80px">
<Rectangle.Fill>
<ImageBrush ImageSource="{Binding Text, ElementName=ImageNameListBox}"/>
</Rectangle.Fill>
</Rectangle>
</Border>
</Grid>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
MainWindow ViewModel:
class MainWindowViewModel : BaseViewModel
{
private DialogService dialogService;
private ObservableCollection<Patient> patienten;
public ObservableCollection<Patient> Patienten
{
get
{
return patienten;
}
set
{
patienten = value;
NotifyPropertyChanged();
}
}
private Patient selectedPatient;
public Patient SelectedPatient {get; set;}
public MainWindowViewModel()
{
LoadingPatients();
//instantiëren DialogService als singleton
dialogService = new DialogService();
}
private void LoadingPatients()
{
//instantiëren dataservice
PatientDataService patientDS =
new PatientDataService();
Patienten = new ObservableCollection<Patient>(patientDS.GetPatienten());
}
}
Note that I didn't include all of the code so my datacontext is set with a ViewModelLocator which you cannot see here.
Is there any way to save the image as a resource or do I have to convert all the images in the /bin/debug/assets/images folder to a resource at startup? If so how do I do that?
Apologies for my English, I'm not a native speaker
Thanks for those who had the courage to read all the way to this line and thanks for those who can and will help me!

You can load the Image as ImageSource from your file and bind it to an Image in your view.
public class MyViewModel
{
public void LoadImage()
{
ImageSource = new BitmapImage(new Uri("assets/images/yourImage.jpg", UriKind.Relative));
}
public ImageSource ImageSource { get; set; }
}
In the view:
<Image Source="{Binding Path=ImageSource}"></Image>
As answer to the comment, this works also inside a listbox.
The View:
<ListBox ItemsSource="{Binding Path=MyImages}">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<Image Source="{Binding Path=ImageSource}"/>
<TextBlock Text="{Binding Path=Name}" />
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
The ViewModel:
public class MainWindowViewModel
{
public void LoadImages()
{
var d = new DirectoryInfo("assets/images");
var images = d.GetFiles();
MyImages = images.Select(x => new MyImageModel(x.Name, new BitmapImage(new Uri(x.FullName))));
}
public IEnumerable<MyImageModel> MyImages { get; set; }
}
The MyImageModel
public class MyImageModel
{
public MyImageModel(string name, ImageSource imageSource)
{
Name = name;
ImageSource = imageSource;
}
public string Name { get; set; }
public ImageSource ImageSource { get; set; }
}

How to add and show images in a WPF TreeView?

I fill a TreeView (WPF) in the code and want to use some icons in the items.
I can load and add BitmapImage but it is only displayed, when the BitmapImage is also assigned to another ImageControl in the window (and shown there):
TreeViewItem newItem = new TreeViewItem();
Image tempImage = new Image();
BitmapImage bitmapImage = new BitmapImage(new Uri(#"/Resources/ok-01.png", UriKind.Relative));
tempImage.Source = bitmapImage;
imageControlInWindow.Source = bitmapImage; //if I delete this line (it is not needed) the image in the TreeViewItem is not shown
TextBlock tempTextBlock = new TextBlock();
tempTextBlock.Inlines.Add(tempImage);
tempTextBlock.Inlines.Add("SomeText");
newItem.Header = tempTextBlock;
How can I force the image to be shown in the TreeView without the hack of showing it outside the treeview as copy?

You are not loading the image files from a proper Resource File Pack URI.
It should look like this:
var bitmapImage = new BitmapImage(new Uri("pack://application:,,,/Resources/ok-01.png"));
The Build Action of the image file must be set to Resource.

MainWindow:
<Window x:Class="TreeViewTest.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525">
<Grid>
<TreeView ItemsSource="{Binding Items}">
<TreeView.ItemTemplate>
<HierarchicalDataTemplate >
<StackPanel Orientation="Horizontal">
<TextBlock Text="{Binding Path=Text}" />
<Image Source="{Binding ImageSource}" Stretch="Uniform" Height="30"/>
</StackPanel>
</HierarchicalDataTemplate>
</TreeView.ItemTemplate>
</TreeView>
</Grid>
Code behind:
public partial class MainWindow
{
public List<MyItem> Items { get; private set; }
public MainWindow()
{
InitializeComponent();
DataContext = this;
Items = new List<MyItem>
{
new MyItem {Text = "Item 1", ImageSource = "/image1.png"},
new MyItem {Text = "Item 2", ImageSource = "/image2.png"}
};
}
}
public class MyItem
{
public string Text { get; set; }
public string ImageSource { get; set; }
}

Why are my BitmapImages not displaying?

Ad[a,o]pting Brundritt's example here, which he referenced in responding to my earlier BingMaps question, I have been able to display certain data in an "infobox" like so:
...but am not getting the BitmapImage that is part of the data I intend to display.
My question is why are the images not displaying, and what do I need to go in order to display them?
It's not the data - I've saved the thumbnail image to a SQLite database, where it is stored as an array of bytes, but which can be seen as images in SQLiteToolbox:
:
So as you can see, the String data is displaying fine, but not the image. Here is the pertinent code I've got for retrieving the data and displaying it:
// The class used to create the SQLite table
public class PhotraxBaseData
{
[SQLite.PrimaryKey]
[SQLite.AutoIncrement]
public int Id { get; set; }
. . .
public DateTime dateTimeTaken { get; set; }
public String filePath { get; set; }
public Byte[] thumbnail { get; set; }
}
private async void Gener8MapMarkers(List<PhotraxBaseData> _pbd)
{
foreach (PhotraxBaseData pbd in _pbd)
{
String descAndFilename = Path.GetFileName(pbd.filePath);
if (null != pbd.imgDescription)
{
descAndFilename = String.Format("{0} - {1}", pbd.imgDescription, descAndFilename);
}
BitmapImage bmi = await PhotraxUtils.ByteArrayToBitmapImage(pbd.thumbnail);
if (PhotraxUtils.ValidLatAndLong(pbd.latitude, pbd.longitude))
{
Location loc = new Location(pbd.latitude, pbd.longitude);
AddPushpin(loc, descAndFilename, pbd.dateTimeTaken, null, DataLayer);
}
}
}
public static async Task<BitmapImage> ByteArrayToBitmapImage(this byte[] byteArray)
{
// from http://dotnetspeak.com/2013/04/convert-byte-array-to-an-image-in-winrt
if (byteArray != null)
{
using (var stream = new InMemoryRandomAccessStream())
{
await stream.WriteAsync(byteArray.AsBuffer());
var image = new BitmapImage();
stream.Seek(0);
image.SetSource(stream);
return image;
}
}
return null;
}
public class PushpinMetadata
{
public string DescAndFileName { get; set; }
public DateTime DateTimeTaken { get; set; }
public BitmapImage Thumbnail { get; set; }
}
public void AddPushpin(Location latlong, string descAndFileName, DateTime dateTimeTaken, BitmapImage thumbnail, MapLayer layer)
{
Pushpin p = new Pushpin()
{
Tag = new PushpinMetadata()
{
DescAndFileName = descAndFileName,
DateTimeTaken = dateTimeTaken,
Thumbnail = thumbnail
}
};
MapLayer.SetPosition(p, latlong);
p.Tapped += PinTapped;
layer.Children.Add(p);
}
private void PinTapped(object sender, Windows.UI.Xaml.Input.TappedRoutedEventArgs e)
{
Pushpin p = sender as Pushpin;
PushpinMetadata m = (PushpinMetadata)p.Tag;
//Ensure there is content to be displayed
if (!String.IsNullOrEmpty(m.DescAndFileName))
{
Infobox.DataContext = m;
Infobox.Visibility = Visibility.Visible;
MapLayer.SetPosition(Infobox, MapLayer.GetPosition(p));
}
else
{
Infobox.Visibility = Visibility.Collapsed;
}
}
The XAML:
<bm:Map.Children>
<!-- Data Layer-->
<bm:MapLayer Name="DataLayer"/>
<!--Common Infobox-->
<bm:MapLayer>
<Grid x:Name="Infobox" Visibility="Collapsed" Margin="0,-115,-15,0">
<Border Width="300" Height="110" Background="Black" Opacity="0.8" BorderBrush="White" BorderThickness="2" CornerRadius="5"/>
<StackPanel Height="100" Margin="5">
<Grid Height="40">
<TextBlock Text="{Binding DescAndFileName}" FontSize="20" Width="250" TextWrapping="Wrap" HorizontalAlignment="Left" />
<Button Content="X" Tapped="CloseInfobox_Tapped" HorizontalAlignment="Right" VerticalAlignment="Top"/>
</Grid>
<Grid Height="40">
<Viewbox Height="200" Stretch="Uniform" StretchDirection="Both">
<Image Source="{Binding Thumbnail}" Width="Auto" Height="Auto" Margin="2"/>
</Viewbox>
</Grid>
<Grid Height="40">
<TextBlock Text="{Binding DateTimeTaken}" FontSize="16" Width="290" TextWrapping="Wrap" Height="Auto"/>
</Grid>
</StackPanel>
</Grid>
</bm:MapLayer>
<callisto:CustomDialog Content="CustomDialog" Height="100" Width="100"/>
</bm:Map.Children>
My guess is that the Image's Source property doesn't quite know what to do with the BitmapImage it's bound to via "Thumbnail"; but I don't know how to unbabelize the mismatch (presuming that's where the problem lies).
UPDATE
To answer Faye's brother Chris, here is the "database" (SQLite class) declaration:
public Byte[] thumbnail { get; set; }
Here is where I was calling the converter method, passing the appropriate member of the class instance, and then adding a pushpin:
BitmapImage bmi = await PhotraxUtils.ByteArrayToBitmapImage(pbd.thumbnail);
if (PhotraxUtils.ValidLatAndLong(pbd.latitude, pbd.longitude))
{
Location loc = new Location(pbd.latitude, pbd.longitude);
//AddPushpin(loc, descAndFilename, pbd.dateTimeTaken, null, DataLayer);
AddPushpin(loc, descAndFilename, pbd.dateTimeTaken, bmi, DataLayer);
}
However: MY BAD, PEOPLES!!!
I had neglected to replace my placeholder "null" arg with "bmi" (you can see my previous code commented out above, and my new working call to AddPushpin() below it). The image's size/scale is all wrong, but that can be fixed easily enough, I reckon.
I don't know whether to jump for joy or kick myself in the keister, so I think I'll do both simultaneously.
Thanks to Mr. Dunaway for making me look closer at my code - something I obviously should have done before posting.

Get thumbnail images of websites?

I tried this code to get thumbnail images fo websites using Websites Screenshot DLL
but the images are not displayed inside my itemscontrol and I get no errors.
public void ImagesActivities()
{
//sep s = new sep();
var images = new ObservableCollection<sep>();
var wcf = new ServiceReferenceSites.SiteEnPlusServiceClient();
foreach (var item in wcf.GetAll())
{
sep s = new sep();
s.title = item.title;
s.thumbnail = (System.Drawing.Image)GetThumbImage(item.urlsite);
images.Add(s);
}
_activityList.ItemsSource = images;
}
private Bitmap GetThumbImage(string s)
{
WebsitesScreenshot.WebsitesScreenshot _Obj;
_Obj = new WebsitesScreenshot.WebsitesScreenshot();
WebsitesScreenshot.WebsitesScreenshot.Result _Result;
_Result = _Obj.CaptureWebpage(s);
if (_Result == WebsitesScreenshot.
WebsitesScreenshot.Result.Captured)
{
_Obj.ImageWidth = 200;
_Obj.ImageHeight = 100;
_Obj.ImageFormat = WebsitesScreenshot.
WebsitesScreenshot.ImageFormats.PNG;
return _Obj.GetImage();
}
else
return null;
}
and this is the code of my itemscontrol:
<ItemsControl x:Name="_activityList" HorizontalAlignment="Right" Margin="0,10,10,10" Width="760">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<UniformGrid Columns="5" IsItemsHost="True"/>
<!--<StackPanel Orientation="Horizontal" IsItemsHost="True"/>-->
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<ItemsControl.ItemTemplate>
<DataTemplate>
<Grid>
<Grid.RowDefinitions>
<RowDefinition/>
<RowDefinition/>
</Grid.RowDefinitions>
<Button Grid.Row="0" Margin="10,20,0,0" BorderThickness="0" Height="100" Width="200">
<Button.Background>
<ImageBrush ImageSource="{Binding thumbnail}" />
</Button.Background>
</Button>
<TextBlock Grid.Row="1" x:Name="nom" Margin="10,0,0,0" TextAlignment="Center" Text="{Binding title}" VerticalAlignment="Center"/>
</Grid>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
This is my sep class
public class sep
{
public string title { get; set; }
public System.Drawing.Image thumbnail { get; set; }
}
Can anyone please help me.

Essentially you have been drawing nulls. The older style of bitmaps do not really travel that well into WPF. You can change this code...
sep s = new sep();
s.title = item.title;
s.thumbnail = (System.Drawing.Image)GetThumbImage(item.urlsite);
to this...
Sep sep = new Sep();
sep.Title = "title";
var bmp = GetThumbImage("xxx");
using (MemoryStream memory = new MemoryStream())
{
bmp.Save(memory, ImageFormat.Png);
memory.Position = 0;
BitmapImage bitmapImage = new BitmapImage();
bitmapImage.BeginInit();
bitmapImage.StreamSource = memory;
bitmapImage.CacheOption = BitmapCacheOption.OnLoad;
bitmapImage.EndInit();
sep.ThumbnailImage = bitmapImage;
}
This code runs an ad-hoc conversion on the Bitmap so that it can be used as a WPF ImageSource.
The 'sep' class is declared with an ImageSource like this...
public class Sep : INotifyPropertyChanged
{
private string _title;
public string Title
{
[DebuggerStepThrough]
get { return _title; }
[DebuggerStepThrough]
set
{
if (value != _title)
{
_title = value;
OnPropertyChanged("Title");
}
}
}
private ImageSource _thumbnailImage;
public ImageSource ThumbnailImage
{
[DebuggerStepThrough]
get { return _thumbnailImage; }
[DebuggerStepThrough]
set
{
if (value != _thumbnailImage)
{
_thumbnailImage = value;
OnPropertyChanged("ThumbnailImage");
}
}
}
#region INotifyPropertyChanged Implementation
public event PropertyChangedEventHandler PropertyChanged;
protected virtual void OnPropertyChanged(string name)
{
var handler = System.Threading.Interlocked.CompareExchange(ref PropertyChanged, null, null);
if (handler != null)
{
handler(this, new PropertyChangedEventArgs(name));
}
}
#endregion
}
In the longer run, you can consider refactoring the conversion into an IValueConverter.