I'm trying to combine multiple js file references using Telerik's script manager. Here is the code I have on page load:
System.Web.UI.ScriptReference jsFile1 = new System.Web.UI.ScriptReference('/virtual_folder/jsfile1.js');
System.Web.UI.ScriptReference jsFile2 = new System.Web.UI.ScriptReference('/virtual_folder/jsfile2.js');
this.Master.ScriptManager.CompositeScript.Scripts.Add(jsFile1);
this.Master.ScriptManager.CompositeScript.Scripts.Add(jsFile2);
I'm getting an error:
[NullReferenceException: Object reference not set to an instance of an object.]
System.Collections.ObjectModel.Collection`1.Add(T item) +18
Telerik.Web.UI.RadScriptManager.Page_PreRenderComplete(Object sender, EventArgs e) +95
System.EventHandler.Invoke(Object sender, EventArgs e) +0
System.Web.UI.Page.OnPreRenderComplete(EventArgs e) +8695102
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1029
What am I doing wrong?
I think that the script combining only works for embedded resources currently so you would have to embed your js Files inside a dll.
On a side note you know you can use
this.Master.ScriptManager.
tried using
RadScriptManager.GetCurrent(this)
I am assuming you are calling this from an aspx page and not an ascx control, otherwise you have to use this.Page.
Related
We've got a Xamarin.Forms Android app in which we're displaying progress on a loading page, the progress value being sent by an event from another class.
We're using FreshMvvm which has ViewIsAppearing and ViewIsDisappearing overrides available in the PageModel.
So we're subscribing on ViewIsAppearing, and unsubscribing in ViewIsDisappearing - we're also unsubscribing in a PrepareForDispose method which is intended to ensure the PageModel has cleaned up so that it can be disposed.
Code is below. ProgressManager is supplied by IoC
protected override void ViewIsAppearing (object sender, EventArgs e)
{
base.ViewIsAppearing (sender, e);
ProgressManager.ProgressEvent += ProgressManager_ProgressEvent;
}
protected override void ViewIsDisappearing (object sender, EventArgs e)
{
base.ViewIsDisappearing (sender, e);
RemoveEventHandlers();
}
public override void PrepareForDispose()
{
RemoveEventHandlers();
base.PrepareForDispose();
}
private void RemoveEventHandlers()
{
ProgressManager.ProgressEvent -= ProgressManager_ProgressEvent;
}
The problem is that, when examining object in Profiler, we can see the LoadingPageModel is still in memory, because of the EventArgs created in the ViewIsAppearing (examining the "Paths To Root" in Profiler tells us this).
When I log/debug the app, I can see that RemoveEventHandlers has been called.
So is _ProgressManager.ProgressEvent -= ProgressManager_ProgressEvent;_ failing to remove the handler, or is there another reason that we've still got a reference to the PageModel from the EventArgs?
Edit One possibility is that we're subscribing more than once, but unsubscribing only once. I've checked with debug/logging, and I don't think this is the case. We're subscribing/unsubscribing symmetrically.
It turns out that we were subscribing twice (due to the lifecyle of the page in question at the start of the app lifecycle). Therefore the single unsubscribe was leaving a subscription behind.
Fixing this fixed the problem.
I'm trying to using PhotoChooserTask for our purposes.
After calling photoChooserTask.Show() chooser is showed but when I choose a picture it's closing and event Completed not fired !
Why?
And more, after that PhotoChooserTask not showed next time when calling Show.
P.S. if i try this code in new solution - it will work fine, but why it doesn't work in our project?
PhotoChooserTask photoChooserTask;
private void button2_Click(object sender, System.Windows.RoutedEventArgs e)
{
photoChooserTask = new PhotoChooserTask();
photoChooserTask.Completed += new EventHandler<PhotoResult>(photoChooserTask_Completed);
photoChooserTask.Show();
// TODO: Add event handler implementation here.
}
void photoChooserTask_Completed(object sender, PhotoResult e)
{
//Bla bla bla
}
I solved this problem.
So, project CAN NOT have more than one photo chooser.
You can't declare PhotoChooserTask in Page1 and Page2 with different logic of processing.
Hope this will helpfull for someone.
You should make sure that you respect the guidelines for creating and initializing the object:
To ensure that your application receives the result of the
PhotoChooserTask, the object must be declared with class scope
within the PhoneApplicationPage class and you must call the chooser
constructor and assign the Completed event delegate within the page’s
constructor.
Source
I'm working on a WP7 app where i need to delete a row using the DeleteOnSubmit() method, but i keep getting a NullReferenceException error. I can't find where the issue is.
public void HardDeleteOrder(int deleteOrderId)
{
var oResult = from o in App.orderDataContext.orders
where o.OrderId == deleteOrderId
select o;
foreach (var oRow in oResult)
{
App.orderDataContext.Orders.DeleteOnSubmit(oRow);
}
App.orderDataContext.SubmitChanges();
}
When i run this, the code crashes on the ending brace of the method with an exception message "NullReferenceException was unhandled".
Here's the Stack trace:
System.NullReferenceException was unhandled
Message=NullReferenceException
StackTrace:
at System.Data.Linq.Mapping.MetaAccessor`2.SetBoxedValue(Object& instance, Object value)
at System.Data.Linq.ChangeProcessor.ClearForeignKeysHelper(MetaAssociation assoc, Object trackedInstance)
at System.Data.Linq.ChangeProcessor.ClearForeignKeyReferences(TrackedObject to)
at System.Data.Linq.ChangeProcessor.PostProcessUpdates(List`1 insertedItems, List`1 deletedItems)
at System.Data.Linq.ChangeProcessor.SubmitChanges(ConflictMode failureMode)
at System.Data.Linq.DataContext.SubmitChanges(ConflictMode failureMode)
at System.Data.Linq.DataContext.SubmitChanges()
at orders.viewmodels.OrderViewModel.HardDeleteOrder(Int32 deleteOrderId)
at orders.OrderView.RemoveOrderFromDatabase()
at orders.OrderView.RemoveOrder()
at orders.OrderView.detailsBarCancel_Click(Object sender, EventArgs e)
at orders.App.detailsBarCancel_Click(Object sender, EventArgs e)
at Microsoft.Phone.Shell.ApplicationBarItemContainer.FireEventHandler(EventHandler handler, Object sender, EventArgs args)
at Microsoft.Phone.Shell.ApplicationBarIconButton.ClickEvent()
at Microsoft.Phone.Shell.ApplicationBarIconButtonContainer.ClickEvent()
at Microsoft.Phone.Shell.ApplicationBar.OnCommand(UInt32 idCommand)
at Microsoft.Phone.Shell.Interop.NativeCallbackInteropWrapper.OnCommand(UInt32 idCommand)
What am I missing here ?
This is mostly due to foreign key constraint.
According to
http://msdn.microsoft.com/en-us/library/bb386925.aspx
LINQ to SQL does not support or recognize cascade-delete operations. If you want to delete a row in a table that has constraints against it, you must complete either of the following tasks:
Set the ON DELETE CASCADE rule in the foreign-key constraint in the database.
Use your own code to first delete the child objects that prevent the parent object from being deleted.
I would like to know if anyone has done this before or tried to do it. I would like to navigate from my current page to a page generated and stored on the isolated storage.
Is that possible?
I already found a way of generating the xaml code and I'm working on generating the xaml.cs file but I can't seem to find a way of navigating to the newly created and existing file in the isolated storage.
I am using the "isostore" URI schema but it throws an exception in RootFrame_NavigationFailed:
[System.InvalidOperationException] = {"No XAML was found at the location '/isostore;/screenTest.xaml'."} . Thank you in advance.
Best regards,
Cipri
I think the closest you can get is:
Store usercontrols (rather than pages) in the isolated storage
Load them using XamlReader.Load
Inject the loaded UserControl inside of the current page
Drawbacks:
You can forget about the code-behind file as you can't compile it. You'll have to find another way to wire-up the events. I suggest taking a MVVM approach, by binding actions and using the same viewmodel for every usercontrol
You're not using the NavigationService, so you have to handle the navigation stuff (back button and application resuming after tombstoning)
public MainPage()
{
InitializeComponent();
this.Loaded += new RoutedEventHandler(MainPage_Loaded);
}
void MainPage_Loaded(object sender, RoutedEventArgs e)
{
string UserName;
IsolatedStorageSettings.ApplicationSettings.TryGetValue<string>("UserName", out UserName);
if (!string.IsNullOrEmpty(UserName))
{
txtUserName.Text = UserName;
txtPassword.Focus();
}
else
txtUserName.Focus();
}
private void btnLogin_Click(object sender, RoutedEventArgs e)
{
IsolatedStorageSettings.ApplicationSettings["UserName"] = txtUserName.Text;
}
The thing is, I got a weird exception from Windows Phone app I am developing:
System.Exception was unhandled
Message=Unspecified error
StackTrace:
at MS.Internal.XcpImports.CheckHResult(UInt32 hr)
at MS.Internal.XcpImports.Collection_AddValue[T](PresentationFrameworkCollection`1 collection, CValue value)
at MS.Internal.XcpImports.Collection_AddDependencyObject[T](PresentationFrameworkCollection`1 collection, DependencyObject value)
at System.Windows.PresentationFrameworkCollection`1.AddDependencyObject(DependencyObject value)
at System.Windows.Controls.UIElementCollection.AddInternal(UIElement value)
at System.Windows.PresentationFrameworkCollection`1.Add(UIElement value)
at System.Windows.Controls.ItemsControl.AddVisualChild(Int32 index, DependencyObject container, Boolean needPrepareContainer)
at System.Windows.Controls.ItemsControl.AddContainerForPosition(GeneratorPosition position)
at System.Windows.Controls.ItemsControl.OnItemsChangedHandler(Object sender, ItemsChangedEventArgs args)
at System.Windows.Controls.ItemContainerGenerator.OnItemAdded(Object item, Int32 index)
at System.Windows.Controls.ItemContainerGenerator.System.Windows.Controls.ICollectionChangedListener.OnCollectionChanged(Object sender, NotifyCollectionChangedEventArgs args)
at System.Windows.Controls.WeakCollectionChangedListener.SourceCollectionChanged(Object sender, NotifyCollectionChangedEventArgs e)
at System.Windows.Controls.ItemCollection.NotifyCollectionChanged(NotifyCollectionChangedEventArgs e)
at System.Windows.Controls.ItemCollection.System.Windows.Controls.ICollectionChangedListener.OnCollectionChanged(Object sender, NotifyCollectionChangedEventArgs e)
at System.Windows.Controls.WeakCollectionChangedListener.SourceCollectionChanged(Object sender, NotifyCollectionChangedEventArgs e)
at System.Collections.ObjectModel.ObservableCollection`1.OnCollectionChanged(NotifyCollectionChangedEventArgs e)
at System.Collections.ObjectModel.ObservableCollection`1.InsertItem(Int32 index, FormItem item)
at System.Collections.ObjectModel.Collection`1.Add(FormItem item)
at //My Code
What my code tried to do is add a item to an ObservableCollection.
I want to step into System.Windows code so I can see what that "Unspecified error" is.
I already do the following in my Visual Studio:
Enable .NET Framework source stepping
Enable source server support
Enable Microsoft Symbol Servers
Despite that, I can't step in (double clicking) into any of System.Windows methods in the call stack.
Any help is appreciated. Let me know if any of you need more clarification.