I've created a class library in C# Visual Express 2010. I built the solution making sure that the target framework was the .NET Framework 4 and not .NET Framework 4 Client Profile.
When I try to create a Console Application and reference the library, none of my classes are recognized.
I have made sure the Console Application is also using the .NET Framework 4 and not .NET Framework 4 Client Profile
I have made sure that I am actually using the namespace of my library.
All the classes I want to access are public.
If I change my Class Library project to a Console Application project, everything works.
Restarting and/or reloading the library does not work.
After I reference my library, it appears under References, but I cannot view it in the object viewer. I'm not sure what this means
The only error messages I receive are:
Error 2 The type or namespace name could not be found (are you missing a using directive or an assembly reference?)
I'm not sure why nothing is recognized, or why I cannot use my library. Does anyone have any ideas of where I can go to look for the solution, or has anyone run into this problem themselves?
I know you have tried a lot of things here, but ultimately the following should work
In your solution make sure you have your class library and your console app (Although you don't need to have the class library in the solution, this is just for sanity sake)
Make sure they are the same framework
Make sure they both compile, take note of any errors or warnings
Add a reference to your library (remove any previous references),i.e click your console app, click Add\Reference, click solution, then check your library, click add
Add the using statement to your console app
Just to make sure everything is good , do a Clean, and rebuild
if you have done all the above and its still not working, then this seems like a benign error
I.e if everything compiles, and there are no warnings, there is really no normal reason why this shouldn't just work
All of classes that defines in class library must have -public- access modifier, unless these assemblies don't work!
Related
I am having a problem with an old library I am trying to re-activate (use again). I have a library called "PLToolbox" in which I have multiple namespaces (e.g. "PLToolbox.FileIO", "PLToolbox.Graphics", "PLToolbox.MathNumeric"). As said all these namespaces live in my PLToolbox library (one file, many namespaces).
I now tied to add an old library (one library containing one namespace). This library/namespace is called "PLToolbox.SQLite", and I have added a new "PLToolbox.SQLite" project to my "PLToolbox" solution, and it compiles just fine and everything is working as expected (building my solution it both generates a "PLToolbox.dll" and a "PLToolbox.SQLite.dll").
My problem is the application using these namespaces (both referencing "PLToolbox" and "PLToolbox.SQLite"). When ever I build this project (a Winform application), where I use classes from the "PLToolbox.SQLite" library, it generates an error message saying: Severity Code Description Project File Line
Error CS0234 The type or namespace name 'SQLite' does not exist in the namespace 'PLToolbox' (are you missing an assembly reference?)
The actual line giving this error message is "using PLToolbox.SQLite;", and as the error states, it tries to look for the "PLToolbox.SQLite" namespace within the "PLToolbox" library, even though this namespace is only defined within the "PLToolbox.SQLite" library. If if remove the "using PLToolbox.SQLite;" from my project and in stead prefix all lines (accessing this library) with "PLToolbox.SQLite." it compiles fine, but this is a drag. Likewise I am sure renaming my "PLToolbox.SQLite" into "PLToolboxSQLite" (or something else) would "fix the problem", but this should work some how with the name is has now?
I am sure this is how I used these two libraries together, back in a previous version of Visual Studio (using version 2.0 of the .Net Framework with Visual Studio 2003/2005). Now I am running with Visual Studio 2015 and .Net Framework 4.0, so perhaps this is the cause? or simply I forgot to do something I did back then?
My bad :-( It turned out that my "PLToolbox.SQLite" was targeting .Net framevork "V4.52.0" (whereas my "PLToolbox" and my Winforms application using both libraries were targeting "V4). As soon as I changed "PLToolbox.SQLite" into "V4" and re-build everything was fine.
In C#, I made a ClassLibrary that has one Namespace and one Class.
I saved it and build it.
in other Projects, when i use it, I add it to my references by browsing to the .dll location.
But The Problem is that its name is not showing up in the Intellisense.
i.e when I: using ... my dll doesn't show ..
I'm Importing the library to a ConsoleApp.
both of the App and the library target Framework is .NET Framework 4.0
and I made their Assembly Version 4.0.0.0 so they're the exact same.
is there a setting or something that I'm missing ?
how can i make it pop up ?
I'm using VS2010 Professional
Thank you for your help
Maybe this be usefull, I was having a similar issue, I have a Web project, add the reference to a Class Library by selecting the project, but if I made a change on the class library, I can´t see that change on the intellisense of the Web Project, after try many things, I see that in the recently added reference, the value of the option "Local Copy" was set "True", then I change it to false and everething works!
I had a similar issue but in my case it was a property on the class. If you go to the file properties and look for a Build Action. Somehow mine was set to Content it had to be set to Compile.
I am using Visual Studio 2013. I hope this helps someone else.
Is the namespace for your assembly different than the namespace for your currently open project? I've had times when the current project and an assembly share the same namespace path the intellisense can mess up.
In general, Visual Studio is pretty good about intellisense generation, especially for C#. But sometimes there are some interesting conditions regarding ambiguities, and especially mixing project types where it just doesn't quite work.
Placing your content in the same namespace makes me wonder if you've actually fixed the problem (it may just be autocompleting the namespace in the currently loaded project rather than the assembly), but if it allows you to continue working, then go with it!
Right click on project on which you add reference of your dll/project select menu project dependancies and select/MarkCheckBox for reference project/dll. then it will work fine.
If the class library project had its name changed after creation, then intellisense may fail finding it due to directory issues, I believe.
I created my class with the generic "ClassLibrary1" or whatever, and then later changed the default namespace, class name, and project name inside of VS2017. I closed VS2017 and changed the directory name to match my default namespace, and then re-associated the project file in VS2017, and then re-added the reference in my main project file.
All seems to be fixed now.
I have an F# application that references a C# assembly (in this case as a project in the same solution) in order to use an existing C# code base. The problem is that every now and then, the F# project seems to go fubar and not recognize the referenced C# assembly, giving me a "The namespace or module 'HCGInterfaces' is not defined". The C# Assembly compiles just fine. I have rebuilt/cleaned the solution, deleted the dlls, removed and re-added the reference and nothing seems to work. The only way that I can get the application up and running again is to delete the F# project and re-add all the F# files. Any idea why this happens and how to stop it from happening? Rebuilding a project from scratch each time is not a really fun option.
Thanks for your help!
[Update] I was able to get my project working again (although I don't know how or why), but now it won't recognize another C# library that I have referenced. In this case, it will not recognize any classes in it, only the interfaces that are part of the library. Very strange. I haven't been able to find anything about this issue, but I'm getting really frustrated with F# (or at least Visual Studio) at this moment!
I have a wpf Application in which I am trying to reference a class library i have created.
I have added a reference to the .dll
And i have added the using statement to my file, and the intellisense actually sees the new namespace.
Then in my code I am able to create new objects of classes in my added .dll just fine. the intellisense sees all the methods ect..no problem, no errors.
when I try to build my wpf application, all the sudden I get the type or namespace cannot be found error on my added dll.
Then i get errors whenever i am trying to create objects from that .dll.
I don't get what is happening.. why does it work before I build, but when I build it decides it doesn't know where that .dll is i am referencing?
Also i have gone to that class library i am trying to add, and mades sure it builds with no errors.
The most common cause of this is that your .DLL targets the full .NET Framework, but the WPF Application targets the Client Profile.
For example, if your library targets .NET 3.5, make sure your WPF Application targets the full .NET 3.5 or 4.0 framework, not the client profile.
A few thoughts on this matter that you can try:
Check that a lower version is not calling a higher version assembly (e.g. .NET 3.5 project is not calling a .NET 4.0 assembly).
Clean -> Build (or Rebuild)
Manually delete bin/obj folders of both caller and calling projects. This forces everything to be built - the 'hard ' way. This may sound redundant, but has worked for me a couple of times.
Restart VS - sometimes, there is just no explanation.
Reboot - when nothing else works, give it a break and try again.
You can Copy any .dll files from other project,
two .dll files.
eg: A.dll,A.pdb
and Rename this two files to your project's name.
Then you can rebuild this project.
If you're getting this without a DLL - just a code file check it's set to compile. In Visual Studio 2013 I keep adding code files and it sets the Build Action (found under Advanced section of Properties of the code file to "Content" rather than "Compile". Change this.
Sometimes an explicit naming of the assembly which contains the namespace is required.
xmlns:myns="clr-namespace:MyNamespace;assembly=MyAssembly"
I don't know why it is sometimes required.
Edit3: Sorry for the constant edits, I'm sure there's a law which states progress is only made once you've publicly requested a solution.
I've opened the oracle assembly in Reflector. The assembly includes a reference to the both the v1.0.3705 mscorlib AND the 2.0.0.0 mscorlib...
It also references a Common.Logging assembly which targets the v1.0.3705 runtime.
This strikes me as at best odd. Anyone ever seen something like this before?
Edit2: Ok, created a WPF application against 3.5. Referenced my API library, added a line to call the code that declares a variable of an interface type declared in the Oracle library and it all works.
So the problem only occurs with Framework 4 applications. This makes a certain amount of sense to me as 3.5 is essentially 2 with some extra libraries. But I'm now confused as to why I can reference a 2 assembly in my 4 project and use its types, just not this Oracle one, and with an unhelpful error.
Edit: Seems to be an issue with the framework version. I'm suprised I haven't encountered something like this before.
Here's the new situation:
Added new Windows forms application set to Framework 2.
Added reference to Coherence DLL in GAC (It never appears in references under assemblies, is that bad?) using path.
Added button with line "INamedCache cache;" That's it. compiled and run. All works fine.
Step 2, remove reference to coherence, add reference to my original API. Compile, all works fine. Remember the API is just running the line of code above.
Now, if I add a reference to the Windows forms application to my WPF application, and create a Form1, again, all the IntelliSense works, but when you compile it gives a "type or namespace not found".
Again, remove the "INamedCache cache;" from the Form1 in the forms application (still referenced by the WPF application) and it all compiles again.
So my WPF Framework 4 application will consume my framework 2 windows forms application (with Forms 2 reference added of course) but if that forms application contains a reference to the oracle library AND declares a variable of an interface type declared in that library. boom, instant failure.
Original post here:
Visual Studio 2010.
I have a WPF windows app project and a class library. The class library references Oracle's Coherence for .NET assembly. The class library has one class with one method which declares a variable of an interface type.
The WPF application has a button which calls this method. IntelliSense works fine.
When I try to compile I get the old "The type or namespace named 'WhyAreYouNotWorking' could not be found" error. I have a demo project which does run, I've copied the references from one to the other with no luck. I've added references to any supporting assemblies.
Also
public void Test()
{
INamedCache cache;
//CacheFactory.SetCacheFactoryConfig("coherence.xml");
//CacheFactory.SetCacheConfig("cache-config.xml");
//CacheFactory.SetPofConfig("pof-config.xml");
//INamedCache cache = CacheFactory.GetCache("ians-cache");
//Console.WriteLine(cache.CacheName);
}
Above you see the one method in my class lib. This lib will compile happily with all those lines commented or uncommented. The WPF application will only compile if I rem out ALL the lines.
So the problem here is the WPF application will not compile with a reference to the class library, if the class library includes code contained in the Coherence Oracle .net assembly.
I'm baffled. Slightly embarrassed and baffled :)
Hmmm, copy to output directory in the reference properties maybe?
Gotcha.
WPF 4.0 application had defaulted to ".NET framework 4 Client Profile". Switching it to ".NET Framework 4" resolved all the problems.
Still don't fully understand why.