I keep getting an "object reference not set to an instance of an object" and i have absolutely no idea why!
MediaElement1.Source = New URI(trackstream(0), UriKind.Absolute)
If i mouseover to check everything it seems fine, that variable position contains a direct link to an mp3, It even says if i mouseover it that the Source has been set to that URL but then i get this error.
i am just trying to set url as the first in a list that i have downloaded from a textfile previously, then put into that array. I have tried changing the urlkind and omitting it.
This works:
public MainWindow()
{
string[] trackstream = new string[] { #"C:\Users\Public\Music\Sample Music\sound.wma" };
InitializeComponent();
media.Source = new Uri(trackstream[0], UriKind.Absolute);
}
Related
I am running the following code in a background thread as an STA apartment to provide a Print Preview in a document viewer:
// Print Preview
public static void PrintPreview(FixedDocument fixeddocument)
{
MemoryStream ms = new MemoryStream();
using (Package p = Package.Open(ms, FileMode.Create, FileAccess.ReadWrite))
{
Uri u = new Uri("pack://TemporaryPackageUri.xps");
PackageStore.AddPackage(u, p);
XpsDocument doc = new XpsDocument(p, CompressionOption.Maximum, u.AbsoluteUri);
XpsDocumentWriter writer = XpsDocument.CreateXpsDocumentWriter(doc);
writer.Write(fixeddocument.DocumentPaginator);
var previewWindow = new Window();
var docViewer = new DocumentViewer();
previewWindow.Content = docViewer;
THIS FAILS ---> docViewer.CommandBindings.Remove(???Print Button???);
FixedDocumentSequence fixedDocumentSequence = doc.GetFixedDocumentSequence();
docViewer.Document = fixedDocumentSequence as IDocumentPaginatorSource;
previewWindow.ShowDialog();
PackageStore.RemovePackage(u);
doc.Close();
}
}
All works well. However, since this is running in its own thread--not the main thread--the print dialogue on the Document Viewer crashes.
In code, how can I remove and/or disable the Print button from the DocumentViewer?? (I have read everything I could find in Google, and it all is in XAML, not very helpful).
Any help is much appreciated. TIA
Update#1: The only way I can see to do this, is to drop the Print Button from the control template and use a custom Document Viewer. A workable style is given at Document Viewer Style.
It still would be nice if I could simply remove the button from the system Document viewer?
Using the method from this answer, you can alter the visibility of the PrintButton programmatically like this. Let's say I put the method in a class called UIElementHelper:
var button = UIElementHelper.FindChild<Button>(docViewer, "PrintButton");
button.Visibility = Visibility.Collapsed;
This is a restatement of my question, the revision history contains the original mess.
What it boils down to is "How do I get the application's directory from my WPF application, at design time?"
Which duplicates the question here so if you happen to be passing by please vote to close, thanks.
Do you need the image to be "Content - Copy if newer"? If you switch it to "Resource" you can use the following path to reference the file:
"/MyImage.JPG"
or a longer version
"pack://application:,,,/MyImage.JPG"
given that the image is in the root of the project, otherwise just change the URI to
"/Some/Path/MyImage.JPG"
UPDATE 1:
For me, the longer pack uri syntax works with an image marked as "Content - Copy if newer" as well. However, the shorter syntax does not work. I.e:
This works:
"pack://application:,,,/MyImage.JPG"
This does NOT work:
"/MyImage.JPG"
I my example I added the image to the root of the project, and marked it as "Content". I then bound the design time data context to a view model with a property returning the longer pack URI above. Doing that results in the Content image being shown correctly at design time.
UPDATE 2:
If you want to load a bitmap source from a pack uri, you can do so by using another overload of the BitmapFrame.Create which takes an URI as the first parameter.
If I understand your problem correctly you get the string with the pack uri as the first item in the object array that is passed to your converter. From this string you want to load a BitmapSource.
Since the string contains a pack URI, you can create an actual URI from the string and then use that URI to load the BitmapSource:
var imagePath = values[0] as string;
// ...
try
{
var packUri = new Uri(imagePath);
BitmapSource bitmap = BitmapFrame.Create(packUri, BitmapCreateOptions.None, BitmapCacheOption.OnLoad);
{
// ...
}
}
}
Just return the exact path of the image from your entity in ImagePath property, such as ..
"C:\MyImage.JPG"
..
OR
..
"C:\MyApp\bin\Debug\MyImage.JPG"
Then your binding (i.e. <Image Source="{Binding ImagePath}" />) in .xaml will start working..
I solved it by leveraging the clevers found in this stackoverflow answer.
public class DMyViewModel : PhotoViewModelBase
{
public override string ImagePath
{
get
{
string applicationDirectory =
(from assembly in AppDomain.CurrentDomain.GetAssemblies()
where assembly.CodeBase.EndsWith(".exe")
select System.IO.Path.GetDirectoryName(assembly.CodeBase.Replace("file:///", ""))
).FirstOrDefault();
return applicationDirectory + "\\MyImage.JPG";
}
}
}
I create some RibbonButtons dynamically and add them to a group according to an xml file. The follwoing function is carried out as often as entries found in the xml file.
private void ExtAppsWalk(ExternalAppsXml p, AppsWalkEventArgs args)
{
RibbonButton rBtn = new RibbonButton();
rBtn.Name = args.Name;
Binding cmdBinding = new Binding("ExtAppCommand");
rBtn.SetBinding(RibbonButton.CommandProperty, cmdBinding);
Binding tagBinding = new Binding("UrlTag");
tagBinding.Mode = BindingMode.OneWayToSource;
rBtn.SetBinding(RibbonButton.TagProperty, tagBinding);
rBtn.Label = args.Haed;
rBtn.Tag = args.Url;
rBtn.Margin = new Thickness(15, 0, 0, 0);
MyHost.ribGrpExtern.Items.Add(rBtn);
}
I tried to use the Tag property to store the Url's to be started when the respective button is clicked. Unfortunately the binding to the Tag property gives me the last inserted Url only.
What would be the best way to figure out which button is hit or to update the Tag property.
The datacontext is by default the context of the Viewmodel. The RibbonGroup to which the Buttons are added is created in the xaml file at designtime. I use that construct:
MyHost.ribGrpExtern.Items.Add(rBtn);
to add the buttons. It maight not really be conform with the mvvm pattern. May be someone else has a better idea to carry that out.
I foud a solution for my problem here and use the RelayCommand class. So I can pass objects (my Url) to the CommandHandler.
RibbonButton rBtn = new RibbonButton();
rBtn.Name = args.Name;
Binding cmdBinding = new Binding("ExtAppCommand");
rBtn.SetBinding(RibbonButton.CommandProperty, cmdBinding);
rBtn.CommandParameter = (object)args.Url;
private void ExtAppFuncExecute(object parameter)
{
if (parameter.ToString().....//myUrl
I'm having difficulty adding the inline of specific type InlineUIContainer into the InlineCollection (Content property) of a TextBlock. It appears the .Add() method of InlineCollection doesn't accept this type, however you can clearly set it through XAML without explicitly marking the content as a InlineContainer, as demonstrated in many examples:
http://msdn.microsoft.com/en-us/library/system.windows.documents.inlineuicontainer.aspx
Is it possible to programatically add one of these as in the following?
Target.Inlines.Add(new Run() { Text = "Test" });
Target.Inlines.Add(new InlineUIContainer() {
Child = new Image() { Source = new BitmapImage(new Uri("http://example.com/someimage.jpg")) } });
Target.Inlines.Add(new Run() { Text = "TestEnd" });
I have a feeling what's going on is that Silverlight is using a value converter to create the runs when specified in XAML as in the example which doesn't use InlineContainer, but I'm not sure where to look to find out.
The specific error I'm getting is as follows:
Cannot add value of type 'System.Windows.Documents.InlineUIContainer' to a 'InlineCollection' in a 'System.Windows.Controls.TextBlock'.
As pointed out by Jedidja, we need to use RichTextBox to do this in Silverlight.
You can't Add() Runs directly, but you can add Spans containing Runs.
Interestingly, you can also do this:
textBlock.Inlines.Clear();
textBlock.Inlines.Add(new Span());
textBlock.Inlines[0] = new Run();
Not that it's a good idea to hack around what the framework is actively trying to prevent you from doing.
P.S. If you can't figure out what XAML is doing, inspect the visual tree.
What I am trying to do is so simple but I am having a hard time making it work. I saw some posts along the same lines but I still have questions.
I have a MenuItem object called mnuA. All I want is set the icon property programatically in C#. I have tried the following
a) mnuA.Icon = new BitmapImage{UriSource = new Uri(#"c:\icons\A.png")};
Results: Instead of showing the actual icon, I get the class name (System.Windows.Media.Imaging.BitmapImage)
b) mnuA.Icon = new BitmapImage(new Uri(#"c:\icons\A.png"));
Results: Instead of showing the actual icon, I get the path of the image (file:///c:/icons/A.png)
What am I doing wrong? Do I really need a converter class for something simple like this?
Try this:
Image img = new Image();
img.Source = new BitmapImage(new Uri(#"c:\icons\A.png"));
mnuA.Icon = img;
Might be a long shot, but try something like:
Uri u = new Uri(...); mnuA.Icon = new
BitmapImage(u);
What it seems its happening is that your icon is getting converted to a string.