What does MissingManifestResourceException mean and how to fix it

Question

The situation    I have a class library  called RT Servers  containing a few resources  of type byte    but I don t think that s important  The same class library contains a method which returns one of those resources I have a simple program  with a reference to that library  that only calls that single method   I get a MissingManifestResourceException with the following message      Could not find any resources   appropriate for the specified culture   or the neutral culture   Make sure    Servers Resources resources  was   correctly embedded or linked into   assembly  RT Servers  at compile time    or that all the satellite assemblies   required are loadable and fully   signed    I have never played around with cultures  or with assembly signing  so I don t know what s going on here  Also  this works in another project which uses the same library  Any ideas

User · Accepted Answer

All I needed to do to fix this problem was to right-click the Resources.resx file in the Solution Explorer and click Run Custom Tool. This re-generates the auto-generated Resources.Designer.cs file.

If the .resx file was added to the project manually, the Custom Tool property of the file must be set to "ResXFileCodeGenerator".

The problem is due to a mismatch of namespaces, which occurs if you change the "default namespace" of the assembly in the project settings. (I changed it from (previously) "Servers" to (now) "RT.Servers".)

In the auto-generated code in Resources.Designer.cs, there is the following code:

internal static global::System.Resources.ResourceManager ResourceManager {
    get {
        if (object.ReferenceEquals(resourceMan, null)) {
            global::System.Resources.ResourceManager temp = new global::System.Resources.ResourceManager("Servers.Resources", typeof(Resources).Assembly);
            resourceMan = temp;
        }
        return resourceMan;
    }
}

The literal string "Servers.Resources" had to be changed to "RT.Servers.Resources". I did this manually, but running the custom tool would have equally well done it.

User · Answer

The solution given by BlaM worked for me too    I am a VS 2013 User  After going through many fixes but no luck  I tried this    Right-click the resource file  one-by-one  in case of multiple-files  Make sure  the property  Build Action  is set to  Embedded Resource     That s it

User · Answer

Recently ran into the same problem  struggled for a bit  found this topic but no answers were correct for me    My issue was that when I removed main window from my WPF project  it does not have a main window   I forgot to remove StartupUri from App xaml  I guess this exception can happen if you have a mistake in StartupUri  so in case if anybody is struggling with this - check your StartupUri in App xaml

User · Answer

I just came across this problem today  and I found this Microsoft Help and Support page that actually did work around the problem   I had a couple delegates at the top of my file  in the global namespace  and all of a sudden I was getting a MissingManifestResourceException when running the program  on this line   this Icon     System Drawing Icon  resources GetObject   this Icon        Then I moved the delegates into the namespace  got the same error   Finally I put the delegates in the only class in that file  and the error went away  but I didn t want the delegates in that class or namespace   Then I came across that link above  which said     To resolve this problem  move all of the other class definitions so that they appear after the form s class definition     I put the delegates  which I would not consider  class definitions   at the bottom of that file  outside of the local namespace  and the program didn t get the MissingManifestResourceException anymore   What an irritating error   But  that seems like a more robust solution than modifying the auto-generated code

User · Answer

I ve run into a similar issue and  although I know it isn t the cause the OP had  I ll post it here so that if someone else runs across this problem in the future an answer will be available   If you add a class before the designer class you will get a MissingManifestResourceException exception at runtime  no compile time error or warning  because     Visual Studio requires that designers use the first class in the file    For  slightly  more information see this post

User · Answer

Also see  MissingManifestResourceException when running tests after building with MSBuild   mresource has path in manifest   I repeat the answer here just for completeness   It appears adding LogicalName to the project file fixes it    lt LogicalName gt   RootNamespace  Properties Resources resources lt  LogicalName gt     i e  so the embedded resource entry in the project file looks like this    lt ItemGroup gt     lt EmbeddedResource Include  Properties Resources resx  gt       lt Generator gt ResXFileCodeGenerator lt  Generator gt       lt LastGenOutput gt Resources Designer cs lt  LastGenOutput gt       lt LogicalName gt   RootNamespace  Properties Resources resources lt  LogicalName gt      lt  EmbeddedResource gt   lt  ItemGroup gt    This is detailed in  http   blogs msdn com b msbuild archive 2007 10 19 manifest-resource-names-changed-for-resources-files aspx  Note that we are using a  resx file  but the bug still appears to occur    Update  The problem with resources  incl  XAML  appears to be related to output paths and the use of forward or backward slashes as detailed in   Why does modifying project output directories cause  IOException was unhandled  quot Cannot locate resource   39 app xaml  39   quot

User · Answer

I had the same issue  but in my case i places a class in a usercontrol which is related to the usercontrol like this  Public Class MyUserControlObject  end Class  Public Class MyUserCOntrol  end Class   The solution was to move the MyUserControlObject to the end of the Usercontrol class  like this  Public Class MyUserCOntrol  end Class  Public Class MyUserControlObject  end Class   I hope this helps

User · Answer

Not sure it will help people but this one worked for me    So the issue I had was that I was getting the following message      Could not find any resources appropriate for the specified culture or the neutral culture   Make sure  My Resources Resources resources  was correctly embedded or linked into assembly  X  at compile time  or that all the satellite assemblies required are loadable and fully signed    I was trying to get the resources that were embedded in my project from another class library   What I did to fix the problem was to set the Access Modifier in the tab Project- Properties- Resources from  Internal   accessible only within the same class library  to  Public   accessible from another class library   Then run and voil    no more error for me

User · Answer

Because I am pre-compiling my web application  using VS2012 publish feature   I was getting the error above  I tried all the suggestions  but weirdly changing  Build Action  to  Content  did the trick

User · Answer

From the Microsoft support page      This problem occurs if you use a localized resource that exists in a satellite assembly that you created by using a  resources file that has an inappropriate file name  This problem typically occurs if you manually create a satellite assembly    To work around this problem  specify the file name of the  resources file when you run Resgen exe  While you specify the file name of the  resources file  make sure that the file name starts with the namespace name of your application  For example  run the following command at the Microsoft Visual Studio  NET command prompt to create a  resources file that has the namespace name of your application at the beginning of the file name   Resgen strings CultureIdentifier resx  MyApp strings CultureIdentifier resources

User · Answer

I had the same problem  but using the Run Custom Tool command as suggested by Timwi did not help in my case   However it lead me into the right direction  because I ended up in the Properties of the  resx file  Here I noticed a difference to another  resx file that caused no problems   In my case I had to change the property  Build Action  from  Resource  to  Embedded Resource    My best guess for the reason is  that I had the  resx in a library that was used from another application  My application did not have its own  resx file  so it had to use the one from the library - which is only available when it s embedded in the library and not  stand alone

User · Answer

I ran into a different cause of this problem  which was unrelated to resx files  I had a class library where AssemblyInfo cs contained the following    assembly  ThemeInfo  ResourceDictionaryLocation SourceAssembly  ResourceDictionaryLocation SourceAssembly     The assembly did not contain any WPF code  theme or Resource dictionaries  I got rid of the exception by removing the ThemeInfo attribute   I did not get an actual exception  only      A first chance exception of type  System Resources MissingManifestResourceException     Viewing exception details  the system was requesting MyAssembly g resources  Hope this might be of help to someone else

User · Answer

When I run in a similar issue  in Vs 2012  it turned out that the  Custom Tool Namespace  property of the resx file was wrong  in my case  actually  it was unset  so the generated code yeld this exception at runtime   My final set of properties for the resx file was something like this    Build action  Embedded Resource Copy to Output Directory  Do not copy Custom Tool  ResXFileCodeGenerator Custom Tool Namespace  My Project S Proper Namespace

User · Answer

I had this problem when I added another class in the file just before the class which derived from Form  Adding it after fixed the problem

User · Answer

I was getting the MissingManifestResourceException error after I ported my project from VS2005 to VS2010  I didn t have any other classes defined in the file that contains my Form class  And I also had my resx Resource File Name set correctly  Didn t work   So I deleted the resx files and regenerated them  All good now

User · Answer

I had the with a newly created F  project  The solution was to uncheck  Use standard resource names  in the project properties -  Application -  Resources   Specify how application resources will be managed  If you do not see the checkbox then update your Visual Studio  I have 15 6 7 installed  In 15 3 2 this checkbox is not there

User · Answer

In my case it was a typo in the Xaml of a window opened from Winforms Form  Incorrect   lt Image Source  quot  Resources WorkGreen gif quot   gt  Correct   lt Image Source  quot    Resources WorkGreen gif quot   gt  It may help someone

User · Answer

I ve encountered this issue with managed C   project based on WinForms after renaming global namespace  not manually  but with Rename tool of VS2017    The solution is simple  but isn t mentioned elsewhere   You have to change RootNamespace entry in vcxproj-file to match the C   namespace

User · Answer

In my case  I have a web api with resources and I create a nuget package from that  When I use this nuget in other projects  I realise that when I request a api with resources  I am getting MissingManifestResourceException after a bit reasearch  I learn nuget packager is not packing resources automatically  If you want to use resources files  you have to do that manually  So you need to add below lines to your  nuspec file   Visit https   github com NuGet Home issues 1482    lt package gt        lt metadata gt       lt  metadata gt       lt files gt           lt file src  bin Debug en MyAssembly resource dll  target  lib net40 en MyAssembly resource dll    gt           lt file src  bin Debug es MyAssembly resource dll  target  lib net40 es MyAssembly resource dll    gt       lt  files gt   lt  package gt    But  before adding files  you need to be sure which version of  net you are using

User · Answer

Recently stumbled upon this issue  in my case I did a few things    Make sure the namespaces are consistent in the Designer cs file of the resx file Make sure the default namespace of the Assembly right click the project and choose Properties  is set the same to the namespace the resources file is in    Once I did step 2  the exception went away

User · Answer

Also the same error may occur when you put a new class into the source code of a designer created form s class   This new class may be removed  and placed in a different cs file    At least in my case this was the problem

User · Answer

Just to mention  If you use a constant or literal  make sure it refers to a resource of the form ProjectName Resources  and does not cpntain Resources resx    It could save you an hour or two

[c#] What does MissingManifestResourceException mean and how to fix it?

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