I have two page application and the main page is default is "MainPage.xaml" and the second one is "AddPerson.xaml" when user click a button on main page I want the app to take user to "AddPerson" page.
And I wrote following for the Click event of the button
Me.Frame.Navigate(System.Type.GetType("AddPerson.xaml"))
and I am getting the following error
An exception of type 'System.NullReferenceException' occurred in MedicineSchedule.exe but was not handled in user code
Additional information: Object reference not set to an instance of an object.
If there is a handler for this exception, the program may be safely continued.
I tried other method of navigationservice.navigate which I cannot find the class in VS2013 express at all. The only method available is Me.Frame.Navigate in my project, please let me know how I can get this simple thing to work.
If it was .net 2.0 I would simple called new form with form.lod or something similar.
This doesn't work?
this.Frame.Navigate(typeof(AddPerson));
If you want/have to use a string take a look at the reply here:
convert string to type of page
Related
I have created a library which has a Popup UserControl similar to the one here.
When I create a fresh Universal Windows App and create the same UserControl inside an app and open the popup, it opens.
But if I create a Class Library and create the same UserControl inside it and try to use it (by opening the popup) inside an app, I get a XamlParseException.
It is as follows -
Windows.UI.Xaml.Markup.XamlParseException occurred
HResult=-2144665590
Message=XAML parsing failed.
Source=Windows
StackTrace:
at Windows.UI.Xaml.Application.LoadComponent(Object component, Uri resourceLocator, ComponentResourceLocation
componentResourceLocation)
at PopupTestLibrary.MyUserControl1.InitializeComponent()
I am not able to understand exactly why this is happening, since the code works fine when not called from an external class library.
Some Questions I found to be similar to mine, here on SO -
XamlParseException when consuming a Page from a library
Cannot instantiate UserControl from another assembly
All help is appreciated!
You need to Add a Resource Dictionary in your App and Add the Usercontrol Xaml content to it
as Xaml is Considered as a Content file not compiled into the code
I think that this post is just as yours.. :
https://social.msdn.microsoft.com/Forums/en-US/63f071be-a3c5-4f2d-ace2-73ca750e3252/rtm-usercontrol-class-library-and-assembly-name-with-
And, It's known issue:
Dot in the project's name cause XAMLParseException
I hope that this will help you in your issue..
I have a problem trying to replicate the File Picker example in link, I create a new application using a Universal Application Windows store template.
I extract the content of the class Scenario02 and create a similar one in my example. This class implements an interface called IFileOpenPickerContinuable which I extract from the class ContinuationManager and create a file in my project with the same name to implement that interface.
I don't get any compilation errors when I run the application. When the line openPicker.PickMultipleFilesAndContinue(); is executed, it throw a exception.
'UnauthorizedAccessException'(Access is denied. Exception from HRESULT: 0x80070005) exception.
In the Microsoft example they don't modify any of the manifests of the application. Do you know what can I be missing?
(Question solved in a question edit. Converted to a community wiki answer.)
The OP wrote:
Solved! The problem was trying to launch the data picker in the class constructor.
I'm coming from VB 6 and am semi-new to VB.NET.
I'm writing a Windows Phone 8 application. There's a grid in which I have several textBlocks that I want to dynamically display data from a file stream (that contains scanned data).
When the WP8 page opens, it automatically loads the data into the textBlocks. This works. Before I load the data from the file, I want to "reset" all textBlocks and hide them. For this I wanted to use a procedure which essentially does the following for every textBlock:
tbl1.Text = ""
tbl1.Visibility = System.Windows.Visibility.Collapsed
This works exactly one time: when the page loads. The procedure does not produce an error.
Now when I call that method again later, when I want to refresh the data shown on the page, I get the following error on the first line of code shown above:
An exception of type 'System.UnauthorizedAccessException' occurred in System.Windows.ni.dll but was not handled in user code
Additional information: Invalid cross-thread access.
I'm a bit lost now. In VB6 I was able to do whatever I wanted with my UI elements. I presume I'm making some kind of newbie mistake here?
I read somewhere about some Dispatcher thing. But that seems overly complicated to simply change a value in a textBlock to me. Is there no simple way?
The solution is indeed to use the Dispatcher.BeginInvoke method.
Dispatcher.BeginInvoke(() =>
{
tbl1.Text = ""
tbl1.Visibility = System.Windows.Visibility.Collapsed
});
The reason why you need this is because you try to access an object that depends on the UI thread from a non-UI thread.
It is probably because you are not calling the method from UI thread. Try using Dispatcher.BeginInvoke:
Dispatcher.BeginInvoke(()=>
{
tbl1.Text = "";
tbl1.Visibility = System.Windows.Visibility.Collapsed;
});
I created a new Windows Store app project using the Grid App (XAML) template. I ran the project (in debug mode) without changing a single line of code. While it was running, I switched back to Visual Studio and clicked the Suspend button in the toolbar.
At this point, the app threw a SuspensionManagerException. The exception’s details weren’t too helpful. The message is SuspensionManager failed. It has the (so far) unhelpful HResult -2146233088. It also has an InnerException that’s just as unhelpful. Its message is Error HRESULT E_FAIL has been returned from a call to a COM component. and its HResult, which is -2147467259, is even worse than the outer exception’s HResult.
The line of code that throws the exception is in the SuspensionManager, which, again, is part of the project template. Here’s the line:
StorageFile file = await ApplicationData.Current.LocalFolder.CreateFileAsync(sessionStateFilename, CreationCollisionOption.ReplaceExisting);
The part that triggers the exception is LocalFolder.CreateFileAsync(…). The MSDN documentation for the CreateFileAsync method has a “Remarks” section that reads: If you try to create a file in a virtual folder like a library or a file group, this method may fail.
That’s it. There’s no explanation of why it may fail, or a description of the conditions under which it may fail, or what you can do about it.
As it happens, even when it fails, the file is actually created. The file in question is called _sessionState.xml and is located at C:\Users\<username>\AppData\Local\Packages\<package_id>\LocalState. If I delete the file and re-suspend the app, the exception is throw again and the file is recreated.
I've searched high and low and haven't found anything conclusive. The CreateFileAsync method is a projection, so I can't easily disassemble it or figure out why it "may fail".
Does anybody have any idea what could be causing this problem, or how to go about debugging or solving it?
The first thing to check is that Frame.Navigate should only take primitives as its parameter argument.
Also, make sure you are calling GetDeferral in your async event handler.
How do you display the Oil/Water/Gas components of a BlackOil domain object programatically on the FunctionWindow? I tried calling FunctionWindow.ShowObject on BlackOil.OilPhase but received an error that it could not be found on the input tree.
I need to say sorry here, but this is the bad case when you can get an programmatically access to the object via FluidFunctionCollection (you can create/update it), but you cannot get access to the same object via InputTree interface (you will receive an UnknownEntity via GetType method when try to navigate from Petrel UI to this object type and send it to your plug-in (doesn't exposed for Ocean from this site yet)), and by this reason you cannot display this object programmatically. I submitted an internal ticket for your case.