The name InitializeComponent does not exist in the current context

Question

If I create a new project in Visual Studio 2010 SP1 and select  WPF Application  and tries to build the generated application  I get the error     The name  InitializeComponent  does not exist in the current context    I got a similar error this morning when I tried to build my current project  Yesterday  I had no problem compiling and running it   I created a new project and got the error whenever I compiled the project  I have just sent the project to a colleague  and he has just compiled without any errors   What is wrong

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In my case  NET Core 3 1  I fixed it by giving it an AssemblyName tag in the ProjectGroup section of the project file  e g   lt Project Sdk  quot Microsoft NET Sdk WindowsDesktop quot  gt     lt PropertyGroup gt       lt TargetFramework gt netcoreapp3 1 lt  TargetFramework gt       lt UseWPF gt true lt  UseWPF gt       lt AssemblyName gt ProjectNameUsually lt  AssemblyName gt     lt  PropertyGroup gt         lt  Project gt   This also fixed a problem it was having with the compiler not seeing a control by its x Name in the code-behind

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The Build Action for the  xaml file must also be set to  Page   when moving a xaml file between projects this setting gets lost  in VS 2010 at least

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Navigate to the solution directory Delete the  obj folder Rebuild the solution   I encountered this error during refactoring where I renamed some files folders and the prexisiting   g cs files needed to be re-generated

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What helped me - is to change first line in  csproj to   lt Project Sdk  Microsoft NET Sdk WindowsDesktop  gt

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This happened to me because a Nuget package uninstaller blew away all the attributes on the  lt Application gt  element in App xaml  This included the x Class attribute  which specifies the application class name  So the partial class containing the InitializeComponent   method was never generated   I fixed the problem by reverting App xaml to the source-controlled copy

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I know this was answered due to a different cause  but this is a highly hit posting and I had ran into the same issue with a class library   In this case  it turned out to be both a change in my namespace  answered in this post here  and that the compiler could not rebuild the Window g i cs which defines the InitializeComponent   method   It couldn t because the class library was missing the ProjectTypeGuid value for WPF projects in the csproj file   Instructions for this are here and here   I thought I would share in case someone else has run into the same issue   Just changing the namespace isn t enough in this case

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You might get this error when you import a class from another project  or change the path of the xaml file  or the namespace of either the xaml or behind  cs file   One  It might have a namespace that is not the same as what you have in you new project  namespace TrainerB MVC Forms        public partial class AboutDeveloper   ContentPage                  public AboutDeveloper                              InitializeComponent                           As you can see the name space in the imported file begins with the old project name   TrainerB   but your new project might have a different name  so just change it to the correct new project name  in both the  xaml file and the behind  cs file   Two   change the properties of the  xaml file to   Build Action  Embedded Resource  Custom Tool  MSBuild UpdateDesignTimeXaml

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I had the same issue  I had to convert my shared project into a portable class library

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I have discovered that the  Startup object  was  Not set  causing this error for me    Startup object   Not set

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So I realize this is an older question  but we were having a similar issue  We were able to build a project using VS2012  but not using msbuild from the command line  I went into the  proj file and noticed it didn t have a record for  ProjectTypeGuids  under the default  PropertyGroup  section  so I added this    lt ProjectTypeGuids gt  60dc8134-eba5-43b8-bcc9-bb4bc16c2548   FAE04EC0-301F-11D3-BF4B-00C04F79EFBC  lt  ProjectTypeGuids gt    which is the project GUID for WPF  I then deleted and re-added the UserControl and it started working  I m not sure if I had to do that last step  but it works for me now

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Additional option   In my case with Xamarin Forms  on top of the  InitializeComponent  does not exist in the current context error in my App xaml file  I also noticed in the output that the  csproj file was failing to build  Weird   Nothing in the file itself stood out to me except these two ItemGroup entries      lt ItemGroup gt       lt EmbeddedResource Remove  App xaml    gt     lt  ItemGroup gt      lt ItemGroup gt       lt ApplicationDefinition Include  App xaml    gt     lt  ItemGroup gt    I removed both from the  csproj file  performed a clean and rebuild and the error finally disappeared  So painful resolving the issue  maybe this will help someone else avoid a bit of stress down the road

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The best shot at an MCVE in this thread is  with VS2017 15 5 2  load up the XAML of LabelControlAdvancedSample  the last example in this tutorial page    lt Window x Class  WpfTutorialSamples Basic controls LabelControlAdvancedSample      xmlns  http   schemas microsoft com winfx 2006 xaml presentation      xmlns x  http   schemas microsoft com winfx 2006 xaml      Title  LabelControlAdvancedSample  Height  180  Width  250  gt   lt StackPanel Margin  10  gt       lt Label Target   Binding ElementName txtName   gt           lt StackPanel Orientation  Horizontal  gt               lt Image Source  http   cdn1 iconfinder com data icons fatcow 16 bullet green png    gt               lt AccessText Text   Name     gt           lt  StackPanel gt       lt  Label gt       lt TextBox Name  txtName    gt       lt Label Target   Binding ElementName txtMail   gt           lt StackPanel Orientation  Horizontal  gt               lt Image Source  http   cdn1 iconfinder com data icons fatcow 16 bullet blue png    gt               lt AccessText Text   Mail     gt           lt  StackPanel gt       lt  Label gt       lt TextBox Name  txtMail    gt   lt  StackPanel gt      Having left the App xaml  amp  App xaml cs at default  attempting to compile the above produces the linker error   Fortunately  when hovering over the InitializeComponent   statement in LabelControlAdvancedSample xaml cs there is a linked text hint       Show potential fixes    Clicking it invokes another linked text      Generate method MainWindow InitializeComponent    Doing this produces the following  do nothing  method       private void InitializeComponent                 throw new NotImplementedException            The function must be defined for the project to build  Looks like something differs in the implementation of InitializeComponent in WPF to VB Net   Edit  The namespace class in the first line of the xaml is not correct   According to MSDN and  Sean B s answer  it should be    lt Window x Class  LabelControlAdvancedSample MainWindow    Thus the project compiles without error and the dummy InitializeComponent method is not required  in fact it generates more errors  Goes to show VS can be helpful  even in the extremely rare case of user error   P

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Since this seems to be the go-to thread for the problem regarding missing  InitializeComponent   I ll include my answer here   I too was having this issue and I ve tried everything I found here and in all other Forums that Google could find  however none resolved the issue for me  After two hours of trying everything  I finally figured out what was wrong with my setup   In our project  we are using Metro components from MahApps  The view that was giving me trouble was a view inheriting from MetroWindow  like this    lt Controls MetroWindow x Class  ProjectNamespace MyView                        xmlns Controls  http   metro mahapps com winfx xaml controls                             gt    Now  I have defined my static resources as   lt Controls MetroWindow Resources gt       lt prop Resources x Key  LocalizedStrings   gt           lt  Controls MetroWindow Resources gt    That s how I ve defined Resources in UserControls in all my other views  so that s what I assumed will work   That was  however  not the case with Controls MetroWindow  There I absolutely needed the resource definition as follows    lt Controls MetroWindow Resources gt       lt ResourceDictionary gt           lt prop Resources x Key  LocalizedStrings   gt                   lt  ResourceDictionary gt   lt  Controls MetroWindow Resources gt    So my issue  in summary  was a missing  lt ResourceDictionary gt  tag  I really don t know why this produced the  InitializeComponent  error and it weirdly didn t even produce it on every machine of mine  but that s how I fixed it  Hope this helps  the remaining 0 001  of people encountering this issue

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If the Namespaces are correct then also there is a same error    Just close your application and open it again   This may solve your problem

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I ve had this  although it was very much my fault and was caused after I copied and pasted some code in   it can occur when the namespace doesn t match between the XAML and code behind  EG   lt UserControl x Class  DockPanel TreeView    gt    and the code behind is   namespace NotDockPanel

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In my case there s been a reference inside my project which was wrong but that wasn t reported   I solved my problem with readding all my references even if they were meant as correct

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Another common cause of this error is if you did something in this    Right click on folder in project to create new UserControl  This creates a class and xaml file that derives from user control in the namespace of the folder  Then you decide to change the namespace of the class because you re really just using folders for organization of code  The x Class attribute will not get automatically updated so it will be searching for a class that doesn t exist  Could probably use a better error message like  x Class type could not be found in namesace bla blaa blaaa

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I had the same problem  expect I coped my MainWindow xaml and cs into a new file and then copied them back to their original place  I then got this error after trying to compile the WPF app   What I did to fix this error was rename the namespace  from egNamespace -  egNamespaceNew  and it worked again  I then changed the namespace back to the original one

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If you are using Xamarin Forms and you move a XAML file the  build action  of the file is changed  Xamarin Forms requires  build action   Embedded Resource    Apply  build action  in Visual Studio   Select the XAML file - gt  Properties - gt  Build Action   Embedded Resource

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In my case the instance of program was already running in background  I just stop the running instance and program built successfully

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None of the above answers worked for me  I tried them all except the duplicate ones  However for some weird reason this worked in my cross-platform project in Visual Studio 2015    Right-click the project that is causing the problem in the Solution Explorer  In the pop-up menu choose  Add --  Class Select cross-platform --  Forms Xaml Page  Keep the pretty Page1 cs standard name and click Add  Notice how the previous InitializeComponent  -problem just disappeared for some reason  Delete the newly created Page1 cs and continue programming as if Visual Studio was working just fine

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this happened with me when I accidentaly deleted the class reference from the xaml definition   I ve replaced the    lt Window x Class  myapp MainWindow      xmlns  http   schemas microsoft com winfx 2006 xaml presentation      xmlns x  http   schemas microsoft com winfx 2006 xaml  gt    first line with this    lt RibbonWindow      xmlns  http   schemas microsoft com winfx 2006 xaml presentation      xmlns x  http   schemas microsoft com winfx 2006 xaml  gt    I know this isn t the answer to the original question  because thats project builds on another machine   but the error message was the same  so maybe I ll help someone with this situation

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I had the same problem  but in my case none of this helped  In my situation every WPF project I had  including newly made projects  stopped compiling with this error  Eventually I uninstalled all the  Net frameworks then reinstalled them and things started working again  I also did a reinstall of Visual Studio  but it turned out that had no affect

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Right click on folder in project to create new UserControl that was the problem for me  I created the same control out side the folder and that was it

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I encountered this while renaming a usercontrol  The way I fixed it was to comment out InitializeComponent  verify that all the names were correct  xaml and code behind   build the project  uncomment InitializeComponent  then build again   It sounds like there may be a couple causes solutions for this issue  but this way did it for me

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The issue appeared while I did not change the code  using a recent VS2019 16 7 5  Just opening for edition the corresponding XAML file solved the problem

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Because of some reason after copying  xaml and it s  cs between projects the build action is sometimes changing  Please make sure build action of your  xaml is Page

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I had this error messages too after I added a new platform  x86  to the Solution Configuration Manager  Before it had only  Any CPU   The solution was still running but showed multiple of these error messages in the error window  I found the problem was that in the project properties the  Output Path  was now pointing to  quot bin x86 Debug quot   This was put in by Configuration Manager at the add operation  The output path of the  Any CPU  platform was always just  quot bin quot   because this test project was never built in release mode   so the Configuration Manager figured it should add the  quot  x86 Debug quot  by itself  There was no indication whatsoever from the error messages that the build output could be the cause and I still don t understand how the project could even run like this  After setting it to  quot bin quot  for all projects in the new  x86  configuration all of the errors vanished

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Check the Designer file   I had this same issue   In my case  the cause was that the namespace for FileName Designer cs did not match the  correct  namespace used in FileName cs   Changing the namespace of FileName Designer cs to match that of FileName cs solved the problem immediately

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Another solution to this problem is to simply change the property-  Build Action on the XAML from Embedded Resource to anything else  save  then change it right back to Embedded Resource  The error goes away

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I try all suggestions above  If you try too without success get the more easy way  Create a new page xaml then copy your code for new class and delete class XAML with problems  Don t spend more time

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For those who find this on the internet  Check the Windows csproj file if the compilation is there  There should be 2 entries   lt Page Include  YourFile xaml  gt     lt SubType gt Designer lt  SubType gt     lt Generator gt MSBuild Compile lt  Generator gt   lt  Page gt    lt Compile Include  YourFile xaml cs  gt     lt DependentUpon gt YourFile xaml lt  DependentUpon gt   lt  Compile gt

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This solved it for me    I had commented out the resources in the App xaml file   lt Application x Class  MyApp App  xmlns  http   schemas microsoft com winfx 2006 xaml presentation      xmlns x  http   schemas microsoft com winfx 2006 xaml  gt     lt Application Resources gt       lt  -- lt ResourceDictionary gt         lt ResourceDictionary MergedDictionaries gt           lt ResourceDictionary             Source   PresentationFramework Aero  Version 3 0 0 0  Culture neutral  PublicKeyToken 31bf3856ad364e35  ProcessorArchitecture MSIL component themes aero normalcolor xaml    gt         lt  ResourceDictionary MergedDictionaries gt       lt  ResourceDictionary gt -- gt     lt  Application Resources gt   lt  Application gt    Commenting thiis back in to fixed the build error     lt Application x Class  MyApp App  xmlns  http   schemas microsoft com winfx 2006 xaml presentation      xmlns x  http   schemas microsoft com winfx 2006 xaml  gt     lt Application Resources gt       lt ResourceDictionary gt         lt ResourceDictionary MergedDictionaries gt           lt ResourceDictionary             Source   PresentationFramework Aero  Version 3 0 0 0  Culture neutral  PublicKeyToken 31bf3856ad364e35  ProcessorArchitecture MSIL component themes aero normalcolor xaml    gt         lt  ResourceDictionary MergedDictionaries gt       lt  ResourceDictionary gt     lt  Application Resources gt   lt  Application gt    Digging a bit deeper I found that the app g cs file in  Project  obj debug only contained the following when I left the resource commented in        lt summary gt      InitializeComponent      lt  summary gt   System Diagnostics DebuggerNonUserCodeAttribute    public void InitializeComponent         if   contentLoaded            return             contentLoaded   true      System Uri resourceLocater   new System Uri   MyApp component app xaml   System UriKind Relative         line 1           App xaml      System Windows Application LoadComponent this  resourceLocater         line default      line hidden

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I just encountered this problem  and it turned out to be that my project is stored in my user folder  which is stored on the network  and we had a momentary network outage   I did a build  it complained that my files had been modified outside the editor  they hadn t  the file locks just got borked   and it built fine  removing the error regarding the InitializeComponent   method   BTW  in case you re wondering  developing something from a network drive is bad practice   It becomes particularly problematic when you re trying to leverage  NET s managed code  in my experience  it freaks out every time you build   I forgot to put this little throw-away project in the proper folder  and ended up paying the price

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yeap  so many things can be    I would add this one    make sure the App xaml points to your Namespace  where your app file is     App eg  x Class  DX App     lt     make sure this is App and not the Main Page name  Hope this works for you too

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I ve encountered this a couple times and keep forgetting what causes it  I ran into this when I renamed the namespace on my code behind file but not in my XAML   So check if you ve done the same     The namespace and class names need to match since they are both part of a partial class  namespace ZZZ            lt summary gt          Interaction logic for MainWindow xaml          lt  summary gt      public partial class MainWindow                                lt  -- XAML -- gt   lt Window x Class  ZZZ MainWindow  gt

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I agree with the answer above that the namespaces have to match   However  I had a problem like this where the namespaces matched   To fix  I simply changed the namespace in the XAML to an INCORRECT one  saved  then changed it back to the CORRECT one   Voila

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Another possible explanation is that you re building against x86  Right-click your Solution and choose Configuration Manager  See if you re building against x86 instead of Any CPU

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There s a very specific reason for this  and it s in the project settings  This usually happens whenever you try to add a WPF control window to a  NET 2 0 class library or project  The reason for this error is that the project does not know it s building a WPF control or window and therefore tries to build it as a C  2 0 project    The solution involves editing the  csproj file  Right click on the project causing the problem and select    Unload Project     Right click the unloaded project and select    Edit  csproj     The  csproj file will open and you can see the XML  look for the following line    lt Import Project         It s near the end of the file  and the only line that you have is probably    lt Import Project    MSBuildBinPath  Microsoft CSharp targets    gt    This tells Visual Studio to build the project as a  NET 2 0 project  What we want to do is to tell Visual Studio that this is actually a WPF project  so we have to add the following line     lt Import Project    MSBuildBinPath  Microsoft WinFX targets    gt    This line will tell Visual Studio to build the project as a WPF project  Now your  csproj file bottom should look like this     lt Import Project    MSBuildBinPath  Microsoft CSharp targets    gt   lt Import Project    MSBuildBinPath  Microsoft WinFX targets    gt    Save the  csproj file  right click it in Solution Explorer and select    Reload Project    compile and that s it  you re all done

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I had the same problem in VS2017  Xamarin Forms project  Reading this bug link   https   bugzilla xamarin com show bug cgi id 33181 c53  To solve the problem in this case  Right-click on  xaml-file-name  xaml  choose Properties  then change the Build Action to Content then back to Embedded resource

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For those who have no errors in Debug mode  but do have the specified error in Release mode  and yet the project runs fine   here is something simple to try    Open the XAML file corresponding to the offending xaml cs file   Make an edit--any edit  like add a space somewhere Save the file and close it   This method worked for me in VS 2015  and according to other users  also 2017 and 2019

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After some action the namespace of the  cs file and the one in  xaml file may be different  in xaml look for the x Class  namespace yourType     Fix them to be the same

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This issue happened for me when creating a  WPF Application Project  then changing its build target to  Class Library  to be used as an external tool by another program   I changed all my  xaml files for my windows so their build action were set to  Page   What I did not realize was that that the project also contained  App xaml  and  App xaml cs      App xaml  needs to be set to  Page  as well  or deleted altogether  along with  App xaml cs    I did the former  then the latter as I realized the files were useless

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Unload the entire solution and then reload it again  Then Rebuild the solution  This resolved the issue for me

[wpf] The name 'InitializeComponent' does not exist in the current context

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