when i run my app i have this exception
Cannot create instance of 'MainWindow' defined in assembly 'MediaTransferTester, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'. Exception has been thrown by the target of an invocation. Error in markup file 'MainWindow.xaml' Line 1 Position 9.
this is my xaml code
<Window x:Class="MediaTransferTester.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow"
Width="878"
Height="588">
<Grid Width="853" Height="525">
<GroupBox Name="groupBox1"
Width="504"
Margin="12,12,0,316"
HorizontalAlignment="Left"
Header="EndPoint Config">
<Grid Width="468" Height="139">
<Label Name="label1"
Width="108"
Height="28"
Margin="6,12,0,0"
HorizontalAlignment="Left"
VerticalAlignment="Top"
Content="Loal IPs" />
<Label Name="label2"
Width="108"
Height="28"
Margin="6,46,0,0"
HorizontalAlignment="Left"
VerticalAlignment="Top"
Content="Remote IP" />
<Label Name="label3"
Width="58"
Margin="183,12,0,116"
HorizontalAlignment="Left"
Content="RTP Port" />
<Label Name="label4"
Width="58"
Height="28"
Margin="183,47,0,0"
HorizontalAlignment="Left"
VerticalAlignment="Top"
Content="RTP Port" />
<Label Name="label5"
Height="28"
Margin="6,84,0,0"
HorizontalAlignment="Left"
VerticalAlignment="Top"
Content="TransportType" />
<RadioButton Name="rbUDP"
Height="16"
Margin="112,89,0,0"
HorizontalAlignment="Left"
VerticalAlignment="Top"
Content="UDP"
GroupName="TransportType"
IsChecked="True" />
<RadioButton Name="rbMSTP"
Height="16"
Margin="165,89,0,0"
HorizontalAlignment="Left"
VerticalAlignment="Top"
Content="MSTP"
GroupName="TransportType" />
<RadioButton Name="rbTCPConnect"
Height="16"
Margin="226,89,0,0"
HorizontalAlignment="Left"
VerticalAlignment="Top"
Content="TCP Connect"
GroupName="TransportType" />
<RadioButton Name="rbTcpListen"
Width="76"
Height="16"
Margin="317,89,0,0"
HorizontalAlignment="Left"
VerticalAlignment="Top"
Content="TCP Listen"
GroupName="TransportType" />
<ListBox Name="listBoxEndPointAddress"
Width="102"
Height="37"
Margin="75,11,0,0"
HorizontalAlignment="Left"
VerticalAlignment="Top"
ScrollViewer.HorizontalScrollBarVisibility="Auto"
ScrollViewer.VerticalScrollBarVisibility="Visible" />
<TextBox Name="TBRemoteEndpointIP"
Width="102"
Height="23"
Margin="75,52,0,0"
HorizontalAlignment="Left"
VerticalAlignment="Top"
LostFocus="TBRemoteEndpointIP_LostFocus" />
<TextBox Name="LocalrtpPort"
Width="38"
Height="23"
Margin="247,12,0,0"
HorizontalAlignment="Left"
VerticalAlignment="Top"
LostFocus="LocalrtpPort_LostFocus"
MaxLength="4" />
<TextBox Name="RemotertpPort"
Width="38"
Height="23"
Margin="247,46,0,0"
HorizontalAlignment="Left"
VerticalAlignment="Top"
LostFocus="RemotertpPort_LostFocus"
MaxLength="4" />
<TextBox Name="localTcpPort"
Width="37"
Height="23"
Margin="0,12,75,0"
HorizontalAlignment="Right"
VerticalAlignment="Top"
LostFocus="localTcpPort_LostFocus"
MaxLength="4" />
<TextBox Name="RemoteTcpPort"
Width="37"
Height="23"
Margin="356,46,0,0"
HorizontalAlignment="Left"
VerticalAlignment="Top"
LostFocus="RemoteTcpPort_LostFocus"
MaxLength="4" />
<Label Name="label9"
Width="57"
Margin="291,11,0,117"
HorizontalAlignment="Left"
Content="TCP Port" />
<Label Name="label11"
Width="57"
Height="28"
Margin="291,49,0,0"
HorizontalAlignment="Left"
VerticalAlignment="Top"
Content="TCP Port" />
</Grid>
</GroupBox>
<GroupBox Name="groupBox2"
Width="504"
Height="269"
Margin="12,215,0,0"
HorizontalAlignment="Left"
VerticalAlignment="Top"
Header="AudioConfig">
<Grid Width="486"
Height="245"
HorizontalAlignment="Stretch"
VerticalAlignment="Stretch">
<Label Name="label6"
Width="90"
Height="28"
Margin="15,30,0,0"
HorizontalAlignment="Left"
VerticalAlignment="Top"
Content="Source Devices" />
<Label Name="label7"
Width="108"
Height="28"
Margin="15,89,0,0"
HorizontalAlignment="Left"
VerticalAlignment="Top"
Content="Sink Devices" />
<Label Name="label10"
Height="28"
Margin="15,150,0,0"
HorizontalAlignment="Left"
VerticalAlignment="Top"
Content="Send Audio Codecs" />
<ListBox Name="SourceDeviceList"
Width="229"
Height="52"
Margin="150,6,0,0"
HorizontalAlignment="Left"
VerticalAlignment="Top"
ScrollViewer.HorizontalScrollBarVisibility="Auto"
ScrollViewer.VerticalScrollBarVisibility="Visible" />
<ListBox Name="SinkDeviceList"
Width="229"
Height="53"
Margin="150,64,0,0"
HorizontalAlignment="Left"
VerticalAlignment="Top"
ScrollViewer.HorizontalScrollBarVisibility="Auto"
ScrollViewer.VerticalScrollBarVisibility="Visible" />
<Label Name="label8"
Width="122"
Height="28"
Margin="15,211,0,0"
HorizontalAlignment="Left"
VerticalAlignment="Top"
Content="Receive Audio Codecs" />
<ListBox Name="SendCodecsNamelistBox"
Width="229"
Height="55"
Margin="150,123,0,0"
HorizontalAlignment="Left"
VerticalAlignment="Top"
ScrollViewer.HorizontalScrollBarVisibility="Auto"
ScrollViewer.VerticalScrollBarVisibility="Visible" />
<ListBox Name="ReceiveCodecsNamelistBox"
Width="229"
Height="56"
Margin="150,183,0,0"
HorizontalAlignment="Left"
VerticalAlignment="Top"
ScrollViewer.HorizontalScrollBarVisibility="Auto"
ScrollViewer.VerticalScrollBarVisibility="Visible" />
</Grid>
</GroupBox>
<Button Name="btnStartSend"
Width="75"
Height="23"
Margin="12,490,0,0"
HorizontalAlignment="Left"
VerticalAlignment="Top"
Click="btnStartSend_Click"
Content="Start Send" />
<Button Name="btnSaveConfig"
Width="109"
Height="23"
Margin="195,490,0,0"
HorizontalAlignment="Left"
VerticalAlignment="Top"
Click="btnSaveConfig_Click"
Content="Save Configration" />
<TextBox Name="StatTextBox"
Width="319"
Height="461"
Margin="522,23,0,0"
HorizontalAlignment="Left"
VerticalAlignment="Top"
Background="Black"
FontFamily="Consolas"
FontSize="9"
Foreground="White"
IsEnabled="True"
IsReadOnly="True"
ScrollViewer.HorizontalScrollBarVisibility="Auto"
ScrollViewer.VerticalScrollBarVisibility="Auto" />
<Button Name="btnStartReceve"
Width="75"
Height="23"
Margin="93,490,0,0"
HorizontalAlignment="Left"
VerticalAlignment="Top"
Click="btnStartReceve_Click"
Content="Start Receve" />
</Grid>
</Window>
and this is the exception details
System.Windows.Markup.XamlParseException was unhandled
Message=Cannot create instance of ‘MainWindow’ defined in assembly ‘MediaTransferTester, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null’. Exception has been thrown by the target of an invocation. Error in markup file ‘MainWindow.xaml’ Line 1 Position 9.
Source=PresentationFramework
LineNumber=1
LinePosition=9
StackTrace:
at System.Windows.Markup.XamlParseException.ThrowException(String message, Exception innerException, Int32 lineNumber, Int32 linePosition, Uri baseUri, XamlObjectIds currentXamlObjectIds, XamlObjectIds contextXamlObjectIds, Type objectType)
at System.Windows.Markup.XamlParseException.ThrowException(ParserContext parserContext, Int32 lineNumber, Int32 linePosition, String message, Exception innerException)
at System.Windows.Markup.BamlRecordReader.ThrowExceptionWithLine(String message, Exception innerException)
at System.Windows.Markup.BamlRecordReader.CreateInstanceFromType(Type type, Int16 typeId, Boolean throwOnFail)
at System.Windows.Markup.BamlRecordReader.GetElementAndFlags(BamlElementStartRecord bamlElementStartRecord, Object& element, ReaderFlags& flags, Type& delayCreatedType, Int16& delayCreatedTypeId)
at System.Windows.Markup.BamlRecordReader.BaseReadElementStartRecord(BamlElementStartRecord bamlElementRecord)
at System.Windows.Markup.BamlRecordReader.ReadElementStartRecord(BamlElementStartRecord bamlElementRecord)
at System.Windows.Markup.BamlRecordReader.ReadRecord(BamlRecord bamlRecord)
at System.Windows.Markup.BamlRecordReader.Read(Boolean singleRecord)
at System.Windows.Markup.TreeBuilderBamlTranslator.ParseFragment()
at System.Windows.Markup.TreeBuilder.Parse()
at System.Windows.Markup.XamlReader.LoadBaml(Stream stream, ParserContext parserContext, Object parent, Boolean closeStream)
at System.Windows.Application.LoadBamlStreamWithSyncInfo(Stream stream, ParserContext pc)
at System.Windows.Application.LoadComponent(Uri resourceLocator, Boolean bSkipJournaledProperties)
at System.Windows.Application.DoStartup()
at System.Windows.Application.<.ctor>b__0(Object unused)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Boolean isSingleParameter)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Boolean isSingleParameter, Delegate catchHandler)
at System.Windows.Threading.Dispatcher.WrappedInvoke(Delegate callback, Object args, Boolean isSingleParameter, 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)
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, Boolean isSingleParameter)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Boolean isSingleParameter, Delegate catchHandler)
at System.Windows.Threading.Dispatcher.WrappedInvoke(Delegate callback, Object args, Boolean isSingleParameter, Delegate catchHandler)
at System.Windows.Threading.Dispatcher.InvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Boolean isSingleParameter)
at System.Windows.Threading.Dispatcher.Invoke(DispatcherPriority priority, Delegate method, Object arg)
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 MediaTransferTester.App.Main() in C:\Users\t.said\documents\visual studio 2010\Projects\MediaTransferTester\MediaTransferTester\obj\x86\Debug\App.g.cs:line 0
at System.AppDomain._nExecuteAssembly(Assembly 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)
at System.Threading.ThreadHelper.ThreadStart()
InnerException: System.Reflection.TargetInvocationException
Message=Exception has been thrown by the target of an invocation.
Source=mscorlib
StackTrace:
at System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandle& ctor, Boolean& bNeedSecurityCheck)
at System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean fillCache)
at System.RuntimeType.CreateInstanceImpl(Boolean publicOnly, Boolean skipVisibilityChecks, Boolean fillCache)
at System.Activator.CreateInstance(Type type, Boolean nonPublic)
at System.Windows.Markup.BamlRecordReader.CreateInstanceFromType(Type type, Int16 typeId, Boolean throwOnFail)
InnerException: System.NullReferenceException
Message=Object reference not set to an instance of an object.
Source=MediaTransferTester
StackTrace:
at MediaTransferTester.MainWindow.RegisterHandlers() in C:\Users\t.said\documents\visual studio 2010\Projects\MediaTransferTester\MediaTransferTester\MainWindow.xaml.cs:line 48
at MediaTransferTester.MainWindow..ctor() in C:\Users\t.said\documents\visual studio 2010\Projects\MediaTransferTester\MediaTransferTester\MainWindow.xaml.cs:line 39
InnerException:
look at the bottom of your inner exception:
Right there, it looks like your problem is a null reference in your code-behind. MainWindow.xaml.cs line 48. Include your code-behind for that section if you need more help than that.