Develop Reference

C# program does not work in the deployed client. Mysql Connector error

I have created an application in visual studio that uses Mysql Connector to access a database of a server. When starting the program in the developing PC it works fine. When i install this program in another PC after some seconds after running there pop ups a error such :
Problem Event Name: CLR20r3
Problem Signature 01: ServiceHoster.exe
Problem Signature 02: 1.0.0.0
Problem Signature 03: 59516cb4
Problem Signature 04: MySql.Data
Problem Signature 05: 6.9.9.0
Problem Signature 06: 5764222b
Problem Signature 07: 712
Problem Signature 08: 59
Problem Signature 09: MySql.Data.MySqlClient.MySql
OS Version: 6.1.7601.2.1.0.272.7
Locale ID: 1031
Additional Information 1: 0a9e
Additional Information 2: 0a9e372d3b4ad19135b953a78882e789
Additional Information 3: 0a9e
Additional Information 4: 0a9e372d3b4ad19135b953a78882e789
When i Debug, on the client machine using visual studio i get the following exception:
MySql.Data.MySqlClient.MySqlException occurred
HResult=0x80004005
Message=Unable to connect to any of the specified MySQL hosts.
Source=<Cannot evaluate the exception source>
StackTrace:
at MySql.Data.MySqlClient.NativeDriver.Open()
at MySql.Data.MySqlClient.Driver.Open()
at MySql.Data.MySqlClient.Driver.Create(MySqlConnectionStringBuilder settings)
at MySql.Data.MySqlClient.MySqlPool.CreateNewPooledConnection()
at MySql.Data.MySqlClient.MySqlPool.GetPooledConnection()
at MySql.Data.MySqlClient.MySqlPool.TryToGetDriver()
at MySql.Data.MySqlClient.MySqlPool.GetConnection()
at MySql.Data.MySqlClient.MySqlConnection.Open()
at DataExchangeLayer.DataExchange.SyncTrainersFromBackendToFrontend()
at ServiceHoster.ViewModel.MainViewModel.UpdateBackendWithFrontend()
at ServiceHoster.ViewModel.MainViewModel.Timer_Tick(Object sender, EventArgs e)
at System.Windows.Threading.DispatcherTimer.FireTick(Object unused)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
at System.Windows.Threading.DispatcherOperation.InvokeImpl()
at System.Windows.Threading.DispatcherOperation.InvokeInSecurityContext(Object state)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at MS.Internal.CulturePreservingExecutionContext.Run(CulturePreservingExecutionContext executionContext, ContextCallback callback, Object state)
at System.Windows.Threading.DispatcherOperation.Invoke()
at System.Windows.Threading.Dispatcher.ProcessQueue()
at System.Windows.Threading.Dispatcher.WndProcHook(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
at System.Windows.Threading.Dispatcher.LegacyInvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg)
at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)
at System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame)
at System.Windows.Application.RunDispatcher(Object ignore)
at System.Windows.Application.RunInternal(Window window)
at System.Windows.Application.Run(Window window)
at System.Windows.Application.Run()
at ServiceHoster.App.Main()
Connection string is as following:
Server=server;Port=some_port;database=database_name;Uid=username;Pwd=password;persistsecurityinfo=True

WPF COMException Crashes Application At Startup (Started Today)

I have just today started seeing this Exception out in the wild on application launch with an app that has been in production for 3 years.
System.TypeInitializationException: The type initializer for 'MS.Win32.Penimc.UnsafeNativeMethods' threw an exception. ---> System.Runtime.InteropServices.COMException: Class not registered (Exception from HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG))
at MS.Win32.Penimc.UnsafeNativeMethods.CoCreateInstance(Guid& clsid, Object punkOuter, Int32 context, Guid& iid)
at MS.Win32.Penimc.UnsafeNativeMethods.CreatePimcManager()
at MS.Win32.Penimc.UnsafeNativeMethods..cctor()
--- End of inner exception stack trace ---
at MS.Win32.Penimc.UnsafeNativeMethods.CreateResetEvent(IntPtr& handle)
at System.Windows.Input.PenThreadWorker..ctor()
at System.Windows.Input.PenThreadPool.GetPenThreadForPenContextHelper(PenContext penContext)
at System.Windows.Input.PenThreadPool.GetPenThreadForPenContext(PenContext penContext)
at System.Windows.Input.StylusWisp.WispTabletDeviceCollection.UpdateTabletsImpl()
at System.Windows.Input.StylusWisp.WispTabletDeviceCollection.UpdateTablets()
at System.Windows.Input.StylusWisp.WispTabletDeviceCollection..ctor()
at System.Windows.Input.StylusWisp.WispLogic.get_WispTabletDevices()
at System.Windows.Input.StylusWisp.WispLogic.RegisterHwndForInput(InputManager inputManager, PresentationSource inputSource)
at System.Windows.Interop.HwndStylusInputProvider..ctor(HwndSource source)
at System.Windows.Interop.HwndSource.Initialize(HwndSourceParameters parameters)
at System.Windows.Window.CreateSourceWindow(Boolean duringShow)
at System.Windows.Window.CreateSourceWindowDuringShow()
at System.Windows.Window.SafeCreateWindowDuringShow()
at System.Windows.Window.ShowHelper(Object booleanBox)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
at System.Windows.Threading.DispatcherOperation.InvokeImpl()
at System.Windows.Threading.DispatcherOperation.InvokeInSecurityContext(Object state)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at MS.Internal.CulturePreservingExecutionContext.Run(CulturePreservingExecutionContext executionContext, ContextCallback callback, Object state)
at System.Windows.Threading.DispatcherOperation.Invoke()
at System.Windows.Threading.Dispatcher.ProcessQueue()
at System.Windows.Threading.Dispatcher.WndProcHook(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
at System.Windows.Threading.Dispatcher.LegacyInvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg)
at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)
at System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame)
at System.Windows.Application.RunDispatcher(Object ignore)
at System.Windows.Application.RunInternal(Window window)
at System.Windows.Application.Run(Window window)
at APSSSentinel.App.Main()
Apparently, some developers using VS2017 who got a Windows update that installed .NET 4.7 have been getting this crash as well, it appears the recommended workaround for now is to turn touch support off.
https://developercommunity.visualstudio.com/content/problem/55303/visual-studio-may-terminate-unexpectedly-when-runn.html
With my application, this is not ideal. Has anyone else run into this, and found any other sort of workaround?

Update: Microsoft has now fixed this problem in a manual update (as noted by Jürgen), personally I will stick with the workaround until the fix is in the automatic update because it would be a lot of work to make every user install a manual update.
This is obviously a bug in .Net 4.7 that affects Windows 7 and 8/8.1 systems that have a touch input device. Therefore one can hope that Microsoft addresses this in a future update. Meanwhile the only way to retain full functionality is by uninstalling and hiding the update.
Other option is disabling the stylys and touch support either in app.config (like in your link) or in the code if the app is compiled with 4.6 or newer. You didn't specify why that is not ideal but I assume those features are needed? Notice that the disabling doesn't mean that every app is unusable with touch devices, but rather that they only use features that are accessible with a mouse. Update: Apparently touch device users without a mouse will have trouble using UI that requires scrolling.
Here's the code examples for those who come here seeking quick fix:
In App.config (works with apps compiled with any framework version)
<configuration>
<runtime>
<AppContextSwitchOverrides value="Switch.System.Windows.Input.Stylus.DisableStylusAndTouchSupport=true" />
</runtime>
</configuration>
In code (when compiled with .Net Framework >= 4.6)
protected override void OnStartup(StartupEventArgs e)
{
AppContext.SetSwitch("Switch.System.Windows.Input.Stylus.DisableStylusAndTouchSupport", true);
base.OnStartup(e);
}

Microsoft has fixed the issue with .NET 4.7 meanwhile, see
https://support.microsoft.com/en-US/help/4033488/comexception-error-from-wpf-applications-after-the-net-framework-4-7-i

C# Exception has been thrown by the target of an invocation

I'm having this error when running my C# .net 4.5 windows forms project from IDE or exe, I have no clear or fixed scenario, and I can't find a clue in the exception that is being thrown. I want to know how to get the source of error and fix it, or at least handle it in a way that does not make the exe crashed!
Below are the details of the exception:
Message:
Exception has been thrown by the target of an invocation.
Inner Exception Message:
Attempted to read or write protected memory.
This is often an indication that other memory is corrupt.
Inner Exception Stack Trace:
at
System.Windows.Forms.UnsafeNativeMethods.CallWindowProc(IntPtr
wndProc, IntPtr hWnd, Int32 msg, IntPtr wParam, IntPtr lParam) at
System.Windows.Forms.NativeWindow.DefWndProc(Message& m) at
System.Windows.Forms.Control.DefWndProc(Message& m) at
System.Windows.Forms.Control.WndProc(Message& m) at
System.Windows.Forms.TextBoxBase.WndProc(Message& m) at
System.Windows.Forms.RichTextBox.WndProc(Message& m) at
System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message&
m) at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr
hWnd, Int32 msg, IntPtr wparam, IntPtr lparam) at
System.Windows.Forms.UnsafeNativeMethods.SendMessage(HandleRef hWnd,
Int32 msg, Int32 wParam, EDITSTREAM lParam) at
System.Windows.Forms.RichTextBox.StreamIn(Stream data, Int32 flags)
at System.Windows.Forms.RichTextBox.StreamIn(String str, Int32 flags)
at System.Windows.Forms.RichTextBox.set_Rtf(String value) at
TragTask.UserControls.CommentControl.SetCommentInfo() in
C:\TFS\Tragging\Tragging
Solutions\TragTask\TragTask\UserControls\CommentControl.cs:line 76
at
TragTask.UserControls.CommentControl.set_Comment(TaskMilestoneTimerAndComment
value) in C:\TFS\Tragging\Tragging
Solutions\TragTask\TragTask\UserControls\CommentControl.cs:line 49
at TragTask.Forms.frmTaskDetails.d__24.MoveNext()
in C:\TFS\Tragging\Tragging
Solutions\TragTask\TragTask\Forms\frmTaskDetails.cs:line 339 at
System.Runtime.CompilerServices.AsyncMethodBuilderCore.MoveNextRunner.InvokeMoveNext(Object
stateMachine) at
System.Threading.ExecutionContext.RunInternal(ExecutionContext
executionContext, ContextCallback callback, Object state, Boolean
preserveSyncCtx) at
System.Threading.ExecutionContext.Run(ExecutionContext
executionContext, ContextCallback callback, Object state, Boolean
preserveSyncCtx) at
System.Runtime.CompilerServices.AsyncMethodBuilderCore.MoveNextRunner.Run()
at
System.Runtime.CompilerServices.TaskAwaiter.<>c__DisplayClass11_0.b__0()
at
System.Runtime.CompilerServices.AsyncMethodBuilderCore.ContinuationWrapper.Invoke()
at
System.Threading.Tasks.SynchronizationContextAwaitTaskContinuation.<>c.<.cctor>b__8_0(Object
state)
TargetSite
{System.Object InvokeMethod(System.Object,
System.Object[], System.Signature, Boolean)}
Target Site, Declaring Types:
{Name = "RuntimeMethodHandle" FullName = "System.RuntimeMethodHandle"}
Stack Trace:
at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[]
arguments, Signature sig, Boolean constructor) at
System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj,
Object[] parameters, Object[] arguments) at
System.Delegate.DynamicInvokeImpl(Object[] args) at
System.Windows.Forms.Control.InvokeMarshaledCallbackDo(ThreadMethodEntry
tme) at
System.Windows.Forms.Control.InvokeMarshaledCallbackHelper(Object obj)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext
executionContext, ContextCallback callback, Object state, Boolean
preserveSyncCtx) at
System.Threading.ExecutionContext.Run(ExecutionContext
executionContext, ContextCallback callback, Object state, Boolean
preserveSyncCtx) at
System.Threading.ExecutionContext.Run(ExecutionContext
executionContext, ContextCallback callback, Object state) at
System.Windows.Forms.Control.InvokeMarshaledCallback(ThreadMethodEntry
tme) at System.Windows.Forms.Control.InvokeMarshaledCallbacks()
at System.Windows.Forms.Control.WndProc(Message& m) at
System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message&
m) at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32
msg, IntPtr wparam, IntPtr lparam) at
System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
at
System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr
dwComponentID, Int32 reason, Int32 pvLoopData) at
System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32
reason, ApplicationContext context) at
System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32
reason, ApplicationContext context) at
System.Windows.Forms.Application.Run() at TragTask.Program.Main()
Update
After C.Evenhuis pointed out that this has to do with CommentControl.SetCommentInfo method, I thought it would be needed to add this method in my question (note that tb_comment is a RichTextBox control):
public bool SetCommentInfo()
{
try
{
this.SuspendLayout();
lbl_user.Text = "userName";
lbl_dateTime.Text = mComment.DateTimeAdded.ToString("dd/MM/yyyy HH:mm:ss");
if (mComment.Comment.TrimStart().StartsWith("{\\rtf1", StringComparison.Ordinal))
{
tb_comment.Clear();
tb_comment.Text = "";
tb_comment.Rtf = mComment.Comment;
}
else
tb_comment.Text = mComment.Comment;
return true;
}
catch (Exception ex)
{
Utils.Global.ErrorLog("SetCommentInfo", ex, true);
return false;
}
finally
{
this.ResumeLayout();
}
}

MSDN:
Corrupted process state exceptions are exceptions that indicate that the state of a process has been corrupted. It's not recommended to execute your application in this state.
By default, the common language runtime (CLR) does not deliver these exceptions to managed code, and the try/catch blocks (and other exception-handling clauses) are not invoked for them. If you are absolutely sure that you want to maintain your handling of these exceptions, you must apply the HandleProcessCorruptedStateExceptionsAttribute attribute to the method whose exception-handling clauses you want to execute. The CLR delivers the corrupted process state exception to applicable exception clauses only in methods that have both the HandleProcessCorruptedStateExceptionsAttribute and SecurityCriticalAttribute attributes.
You can also add the to your application's configuration file. This will ensure that corrupted state exceptions are delivered to your exception handlers without the HandleProcessCorruptedStateExceptionsAttribute or SecurityCriticalAttribute attribute. This configuration element has no effect on applications that were compiled in versions previous to the .NET Framework 4 but are running in the .NET Framework 4 or later; corrupted state exceptions will continue to be delivered for those applications. The HandleProcessCorruptedStateExceptionsAttribute attribute is ignored when it is encountered in partially trusted or transparent code, because a trusted host should not allow an untrusted add-in to catch and ignore these serious exceptions.

Locating the source of an UnhandledException

My program seems to have a bug in it which I'm finding hard to track down. The program is multithreaded and quite complex. In a nutshell it communicates with multiple clients using asynchronous sockets and writes to the database.
A System.Reflection.TargetInvocationException is thrown when I hammer the program with client communications and hold down the enter key to spam writes into the database. At some point in time the exception is thrown which I'm catching with the following snippet of code in the constructor of the main window:
VMMainWindow()
{
...
System.Windows.Threading.Dispatcher.CurrentDispatcher.UnhandledException += new System.Windows.Threading.DispatcherUnhandledExceptionEventHandler(CurrentDispatcher_UnhandledException);
....
}
static void CurrentDispatcher_UnhandledException(object sender, System.Windows.Threading.DispatcherUnhandledExceptionEventArgs e)
{
string str = e.ToString();
}
I don't have much to work with but I was wondering if someone could suggest some tools or or point me in the right direction to help me detect the location of this exception. The exception in detail is pasted below.
System.Reflection.TargetInvocationException was unhandled Message=Exception has been thrown by the target of an invocation. Source=mscorlib StackTrace:
at System.RuntimeMethodHandle._InvokeMethodFast(IRuntimeMethodInfo method, Object target, Object[] arguments, SignatureStruct& sig, MethodAttributes methodAttributes, RuntimeType typeOwner)
at System.RuntimeMethodHandle.InvokeMethodFast(IRuntimeMethodInfo method, Object target, Object[] arguments, Signature sig, MethodAttributes methodAttributes, RuntimeType typeOwner)
at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean skipVisibilityChecks)
at System.Delegate.DynamicInvokeImpl(Object[] args)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)
at System.Windows.Threading.DispatcherOperation.InvokeImpl()
at System.Windows.Threading.DispatcherOperation.InvokeInSecurityContext(Object state)
at System.Threading.ExecutionContext.runTryCode(Object userData)
at System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode code, CleanupCode backoutCode, Object userData)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Windows.Threading.DispatcherOperation.Invoke()
at System.Windows.Threading.Dispatcher.ProcessQueue()
at System.Windows.Threading.Dispatcher.WndProcHook(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)
at System.Windows.Threading.Dispatcher.InvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg)
at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)
at System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame)
at System.Windows.Threading.Dispatcher.Run()
at System.Windows.Application.RunDispatcher(Object ignore)
at System.Windows.Application.RunInternal(Window window)
at System.Windows.Application.Run(Window window)
at System.Windows.Application.Run()
at SupernovaServer.App.Main() in D:\Projects\Supernova Server\Server\obj\x86\Debug\App.g.cs:line 0
at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart() InnerException: System.ArgumentOutOfRangeException
Message=Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index
Source=mscorlib
ParamName=index
StackTrace:
at System.ThrowHelper.ThrowArgumentOutOfRangeException()
at System.Collections.Generic.List`1.get_Item(Int32 index)
at System.Collections.ObjectModel.Collection`1.System.Collections.IList.get_Item(Int32 index)
at System.Windows.Data.ListCollectionView.AdjustBefore(NotifyCollectionChangedAction action, Object item, Int32 index)
at System.Windows.Data.ListCollectionView.ProcessCollectionChanged(NotifyCollectionChangedEventArgs args)
at System.Windows.Data.CollectionView.OnCollectionChanged(Object sender, NotifyCollectionChangedEventArgs args)
InnerException:

Is it possible that you have multiple threads making concurrent accesses to a collection that isn't thread-safe? Say, one thread removing an item while another is reading or adding? That would definitely cause this type of error. In general, the .NET collection classes (except for those in System.Collections.Concurrent) are not thread-safe. You can have multiple readers, but any modification of the collection is going to require exclusive access--protected by a lock or a reader/writer lock.

It's pretty safe to assume App.g.cs is not where the problem lies, so as you said, there isn't much to go on. So here's my hint to you: look at the inner exception. Those things are quite handy, and I'll be willing to bet you have an inner exception at least one layer deep.

WPF DataGrid Selected Items NullArgumentException

I have started getting the above exception from a command linked from a DelegateCommand to a ViewModel. The exception says
{"Value cannot be null.\r\nParameter name: key"}
StackTrace...
at System.Collections.Generic.Dictionary`2.FindEntry(TKey key)
at System.Collections.Generic.Dictionary`2.TryGetValue(TKey key, TValue& value)
at System.Windows.Controls.DataGridItemAttachedStorage.TryGetValue(Object item, DependencyProperty property, Object& value)
at System.Windows.Controls.DataGridRow.RestoreAttachedItemValue(DependencyObject objectWithProperty, DependencyProperty property)
at System.Windows.Controls.DataGridRow.SyncProperties(Boolean forcePrepareCells)
at System.Windows.Controls.DataGridRow.PrepareRow(Object item, DataGrid owningDataGrid)
at System.Windows.Controls.DataGrid.PrepareContainerForItemOverride(DependencyObject element, Object item)
at System.Windows.Controls.ItemsControl.MS.Internal.Controls.IGeneratorHost.PrepareItemContainer(DependencyObject container, Object item)
at System.Windows.Controls.ItemContainerGenerator.System.Windows.Controls.Primitives.IItemContainerGenerator.PrepareItemContainer(DependencyObject container)
at System.Windows.Controls.VirtualizingStackPanel.InsertContainer(Int32 childIndex, UIElement container, Boolean isRecycled)
at System.Windows.Controls.VirtualizingStackPanel.AddContainerFromGenerator(Int32 childIndex, UIElement child, Boolean newlyRealized)
at System.Windows.Controls.VirtualizingStackPanel.MeasureOverride(Size constraint)
at System.Windows.Controls.Primitives.DataGridRowsPresenter.MeasureOverride(Size constraint)
at System.Windows.FrameworkElement.MeasureCore(Size availableSize)
at System.Windows.UIElement.Measure(Size availableSize)
at System.Windows.ContextLayoutManager.UpdateLayout()
at System.Windows.ContextLayoutManager.UpdateLayoutCallback(Object arg)
at System.Windows.Media.MediaContext.InvokeOnRenderCallback.DoWork()
at System.Windows.Media.MediaContext.FireInvokeOnRenderCallbacks()
at System.Windows.Media.MediaContext.RenderMessageHandlerCore(Object resizedCompositionTarget)
at System.Windows.Media.MediaContext.RenderMessageHandler(Object resizedCompositionTarget)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)
at System.Windows.Threading.DispatcherOperation.InvokeImpl()
at System.Windows.Threading.DispatcherOperation.InvokeInSecurityContext(Object state)
at System.Threading.ExecutionContext.runTryCode(Object userData)
at System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode code, CleanupCode backoutCode, Object userData)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Windows.Threading.DispatcherOperation.Invoke()
at System.Windows.Threading.Dispatcher.ProcessQueue()
at System.Windows.Threading.Dispatcher.WndProcHook(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)
at System.Windows.Threading.Dispatcher.InvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg)
at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)
at System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame)
at System.Windows.Threading.Dispatcher.Run()
at System.Windows.Application.RunDispatcher(Object ignore)
at System.Windows.Application.RunInternal(Window window)
at System.Windows.Application.Run(Window window)
at System.Windows.Application.Run()
at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart()
The funny thing is I have a command 'wired' from the View to the ViewModel in just the same way and it works fine.
I'd include the offending code, but the intellisense breaks out at 'No Source Available'. Where is this coming from and how can I get rid of it?!
EDIT:
XAML:
<Grid Grid.Column="0" Grid.Row="0">
<DataGrid ItemsSource="{Binding Path=ObservableCollectionOfActiveObjects}" SelectedItem="{Binding Path=SelectedObject}" IsEnabled="{Binding Path=IsDoingNothing}">
<DataGrid.Columns>
<DataGridTextColumn Binding="{Binding Id}" Header="ID"/>
<DataGridTextColumn Binding="{Binding Name}" Header="Object Name"/>
</DataGrid.Columns>
</DataGrid>
</Grid>
ViewModel
private void DoDataGridCommand()
{
if (DoHaveAllTheCollections() &&
selectedObject != null &&
!otherListOfObject.Contains(selectedObject))
{
activeObjects.Remove(selectedObject);
excludedObjects.Add(selectedObject);
RaisePropertyChanged(activeObjectsPropertyName);
RaisePropertyChanged(excludedObjectsPropertyName);
}
}
I hope this helps.... the exception throws just after the DoDataGridCommand() ends...
EDIT2:
I believe I have found the answer.
While playing with the two lists of objects (happened to be ObservableCollections, maybe this makes a difference?), in the example of the 'switch operation' that worked I was adding the object to the new list and then removing it from the old one.
In the one that threw the exception, I was adding it to the collection and then removing it from the other. I guess this is because (and please input would be appreciated if my assumption is wrong), as everything is a reference in C#, I moved the 'pointer' then removed the pointers reference to the old list, when, I guess it didn't exist anymore. I suppose it's a rookie mistake, but I hardly think I deserve demerits! Ah well, at least the problem appears solved! Many thanks for your inputs.

Could you check the data that is being bound to the grid? It looks a bit like the DataGrid is looking for a column/property in the rows that doesn't exist.