xamlparseexception未能处理我能做什么

Question

当我运行我的应用程序时，我有这个例外

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.

这是我的xaml代码

<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>

，这是例外情况

System.Windows.Markup.XamlParseException未处理   Message =无法创建＆＃39; MainWindow＆＃39;在assembly＆＃39; MediaTransferTester中定义，Version = 1.0.0.0，Culture = neutral，PublicKeyToken = null＆＃39;。调用的目标抛出了异常。标记文件出错＆＃39; MainWindow.xaml＆＃39;第1行位置9。   来源= PresentationFramework   LineNumber上= 1   LinePosition = 9   堆栈跟踪：        at System.Windows.Markup.XamlParseException.ThrowException（String message，Exception innerException，Int32 lineNumber，Int32 linePosition，Uri baseUri，XamlObjectIds currentXamlObjectIds，XamlObjectIds contextXamlObjectIds，Type objectType）        在System.Windows.Markup.XamlParseException.ThrowException（ParserContext parserContext，Int32 lineNumber，Int32 linePosition，String message，Exception innerException）        在System.Windows.Markup.BamlRecordReader.ThrowExceptionWithLine（String message，Exception innerException）        在System.Windows.Markup.BamlRecordReader.CreateInstanceFromType（Type type，Int16 typeId，Boolean throwOnFail）        在System.Windows.Markup.BamlRecordReader.GetElementAndFlags（BamlElementStartRecord bamlElementStartRecord，Object＆amp; element，ReaderFlags＆amp; flags，Type＆amp; delayCreatedType，Int16＆amp; delayCreatedTypeId）        在System.Windows.Markup.BamlRecordReader.BaseReadElementStartRecord（BamlElementStartRecord bamlElementRecord）        在System.Windows.Markup.BamlRecordReader.ReadElementStartRecord（BamlElementStartRecord bamlElementRecord）        在System.Windows.Markup.BamlRecordReader.ReadRecord（BamlRecord bamlRecord）        在System.Windows.Markup.BamlRecordReader.Read（Boolean singleRecord）        在System.Windows.Markup.TreeBuilderBamlTranslator.ParseFragment（）        在System.Windows.Markup.TreeBuilder.Parse（）        在System.Windows.Markup.XamlReader.LoadBaml（Stream stream，ParserContext parserContext，Object parent，Boolean closeStream）        在System.Windows.Application.LoadBamlStreamWithSyncInfo（Stream stream，ParserContext pc）        在System.Windows.Application.LoadComponent（Uri resourceLocator，Boolean bSkipJournaledProperties）        在System.Windows.Application.DoStartup（）        在System.Windows.Application。＆lt; .ctor＆gt; b__0（对象未使用）        在System.Windows.Threading.ExceptionWrapper.InternalRealCall（委托回调，对象args，布尔isSingleParameter）        at System.Windows.Threading.ExceptionWrapper.TryCatchWhen（Object source，Delegate callback，Object args，Boolean isSingleParameter，Delegate catchHandler）        在System.Windows.Threading.Dispatcher.WrappedInvoke（委托回调，Object args，Boolean isSingleParameter，Delegate catchHandler）        在System.Windows.Threading.DispatcherOperation.InvokeImpl（）        at System.Windows.Threading.DispatcherOperation.InvokeInSecurityContext（Object state）        在System.Threading.ExecutionContext.runTryCode（Object userData）        在System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup（TryCode代码，CleanupCode backoutCode，Object userData）        在System.Threading.ExecutionContext.RunInternal（ExecutionContext executionContext，ContextCallback回调，对象状态）        在System.Threading.ExecutionContext.Run（ExecutionContext executionContext，ContextCallback回调，对象状态）        在System.Windows.Threading.DispatcherOperation.Invoke（）        在System.Windows.Threading.Dispatcher.ProcessQueue（）        在System.Windows.Threading.Dispatcher.WndProcHook（IntPtr hwnd，Int32 msg，IntPtr wParam，IntPtr lParam，Boolean＆amp; handling）        在MS.Win32.HwndWrapper.WndProc（IntPtr hwnd，Int32 msg，IntPtr wParam，IntPtr lParam，Boolean＆amp; handling）        在MS.Win32.HwndSubclass.DispatcherCallbackOperation（Object o）        在System.Windows.Threading.ExceptionWrapper.InternalRealCall（委托回调，对象args，布尔isSingleParameter）        at System.Windows.Threading.ExceptionWrapper.TryCatchWhen（Object source，Delegate callback，Object args，Boolean isSingleParameter，Delegate catchHandler）        在System.Windows.Threading.Dispatcher.WrappedInvoke（委托回调，Object args，Boolean isSingleParameter，Delegate catchHandler）        在System.Windows.Threading.Dispatcher.InvokeImpl（DispatcherPriority priority，TimeSpan timeout，Delegate方法，Object args，Boolean isSingleParameter）        在System.Windows.Threading.Dispatcher.Invoke（DispatcherPriority priority，Delegate方法，Object arg）        在MS.Win32.HwndSubclass.SubclassWndProc（IntPtr hwnd，Int32 msg，IntPtr wParam，IntPtr lParam）        在MS.Win32.UnsafeNativeMethods.DispatchMessage（MSG＆amp; msg）        在System.Windows.Threading.Dispatcher.PushFrameImpl（DispatcherFrame框架）        在System.Windows.Threading.Dispatcher.PushFrame（DispatcherFrame框架）        在System.Windows.Threading.Dispatcher.Run（）        在System.Windows.Application.RunDispatcher（Object ignore）        在System.Windows.Application.RunInternal（窗口窗口）        在System.Windows.Application.Run（窗口窗口）        在System.Windows.Application.Run（）        在MediaTransferTester.App.Main（）中的C：\ Users \ t.said \ documents \ visual studio 2010 \ Projects \ MediaTransferTester \ MediaTransferTester \ obj \ x86 \ Debug \ App.g.cs：第0行        在System.AppDomain._nExecuteAssembly（Assembly assembly，String [] args）        在System.AppDomain.ExecuteAssembly（String assemblyFile，Evidence assemblySecurity，String [] args）        在Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly（）        在System.Threading.ThreadHelper.ThreadStart_Context（对象状态）        在System.Threading.ExecutionContext.Run（ExecutionContext executionContext，ContextCallback回调，对象状态）        在System.Threading.ThreadHelper.ThreadStart（）   InnerException：System.Reflection.TargetInvocationException        Message =调用目标抛出了异常。        来源= mscorlib程序        堆栈跟踪：             在System.RuntimeTypeHandle.CreateInstance（RuntimeType类型，Boolean publicOnly，Boolean noCheck，Boolean＆amp; canBeCached，RuntimeMethodHandle＆amp; ctor，Boolean＆amp; bNeedSecurityCheck）             在System.RuntimeType.CreateInstanceSlow（Boolean publicOnly，Boolean fillCache）             在System.RuntimeType.CreateInstanceImpl（Boolean publicOnly，Boolean skipVisibilityChecks，Boolean fillCache）             在System.Activator.CreateInstance（Type type，Boolean nonPublic）             在System.Windows.Markup.BamlRecordReader.CreateInstanceFromType（Type type，Int16 typeId，Boolean throwOnFail）        InnerException：System.NullReferenceException             Message =对象引用未设置为对象的实例。             来源= MediaTransferTester             堆栈跟踪：                  在C：\ Users \ t.said \ documents \ visual studio 2010 \ Projects \ MediaTransferTester \ MediaTransferTester \ MainWindow.xaml.cs中的MediaTransferTester.MainWindow.RegisterHandlers（）：第48行                  在MediaTransferTester.MainWindow..ctor（）中的C：\ Users \ t.said \ documents \ visual studio 2010 \ Projects \ MediaTransferTester \ MediaTransferTester \ MainWindow.xaml.cs：第39行             InnerException：

Answer 1

查看内部异常的底部：

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: 

就在那里，看起来您的问题是代码隐藏中的空引用。 MainWindow.xaml.cs第48行。如果您需要更多帮助，请包含该部分的代码隐藏。