I would like to add a project.json library into my solution, so I could debug through the library code. My main project is csproj.
For example I get latest from Rx.NET githab and add System.Reactive.Core to the solution. I reference System.Reactive.Core from the main winforms csproj.
When I try to use anything from the System.Reactive.Core, Visual Studio cannot compile the code saying that "The reference to XXXX could not be resolved." similar to what is said in this question.
The reference to the library is shown in the References node of the project, but that does not help.
What is the best way to resolve this, short of creating a new csproj, and adding all the files from System.Reactive.Core project to it and referencing that?
Update
This is not a duplicate of How to Reference .xproj into .csproj?. It's specific to referencing from a WinFroms project. The accepted answer suggest converting the project to xproj: it is unclear how to do that for WinForms project and if it is possible at all, and also the other answer claims that xproj is a dead-end. Referencing NuGet package is not suitable for the stated goal of source code debugging. Looking for practical solutions.
I know the error message is common and there are plenty of questions on SO about this error, but no solutions have helped me so far, so I decided to ask the question. Difference to most of similar questions is me using App_Code directory.
Error message:
CS0012: The type 'Project.Rights.OperationsProvider' is defined in an
assembly that is not referenced. You must add a reference to assembly
'Project.Rights, version=1.0.0.0, Culture=neutral, PublicKeyToken=null'.
Source File:
c:\inetpub\wwwroot\Test\Website\App_Code\Company\Project\BusinessLogic\Manager.cs
Following suggestions here and here, I have deleted all instances of Project.Rights.dll inside C:\Windows\Microsoft.NET/*.*
According to this, I checked if .cs files in question have build action set to "Compile". They do.
I have also double checked that the .cs file containing the "Project.Rights.OperationsProvider" type is deployed to App_Code directory.
For some reason, application is not looking for the type in the App_Code directory. Since I've deleted all instances of Project.Rights.dll (that I know of), I don't know which assembly the error message is mentioning.
When you get this error it isn't always obvious what is going on, but as the error says - you are missing a reference. Take the following line of code as an example:
MyObjectType a = new MyObjectType("parameter");
It looks simple enough and you probably have referenced "MyObjectType" correctly. But lets say one of the overloads for the "MyObjectType" constructor takes a type that you don't have referenced. For example there is an overload defined as:
public MyObjectType(TypeFromOtherAssembly parameter) {
// ... normal constructor code ...
}
That is at least one case where you will get this error. So, look for this type of pattern where you have referenced the type but not all the types of the properties or method parameters that are possible for functions being called on that type.
Hopefully this at least gets you going in the right direction!
Check target framework in the projects.
In my case "You must add a reference to assembly" actually meant, that caller and reference projects didn't have the same target framework. The caller project had .Net 4.5 , but referenced library had target 4.6.1.
I am sure, that MS compiler can be smarter and log more meaningful error message. I've added a suggestion to https://github.com/dotnet/roslyn/issues/14756
In my case this was because doing a NuGet package update had only updated references to a dll dependency in some but not all projects in my solution - resulting in conflicting versions. Using a grep-style tool to search text within *.csproj files in my solution it was then easy to see the projects that still needed to be updated.
When you get this error, it means that code you are using makes a reference to a type that is in an assembly, but the assembly is not part of your project so it can't use it.
Deleting Project.Rights.dll is the opposite of what you want. You need to make sure your project can reference the assembly. So it must either be placed in the Global Assembly Cache or your web application's ~/Bin directory.
Edit-If you don't want to use the assembly, then deleting it is not the proper solution either. Instead, you must remove all references to it in your code. Since the assembly isn't directly needed by code you've written, but instead by something else you're referencing, you'll have to replace that referenced assembly with something that doesn't have Project.Rights.dll as a dependency.
In my case, I was referencing a library that was being built to the wrong Platform/Configuration (I had just created the referenced library).
Furthermore, I was unable to fix the problem in Visual Studio Configuration Manager -- unable to switch and create new Platforms and Configurations for this library. I fixed it by correcting the entries in the ProjectConfigurationPlatforms section of the .sln file for that project. All its permutations were set to Debug|Any CPU (I'm not sure how I did that). I overwrote the entries for the broken project with the ones for a working project and changed the GUID for each entry.
Entries for functioning project
{9E93345C-7A51-4E9A-ACB0-DAAB8F1A1267}.Release|x64.ActiveCfg = Release|x64
{9E93345C-7A51-4E9A-ACB0-DAAB8F1A1267}.Release|x64.Build.0 = Release|x64
Entries for corrupted project
{94562215-903C-47F3-BF64-8B90EF43FD27}.Release|x64.ActiveCfg = Debug|Any CPU
{94562215-903C-47F3-BF64-8B90EF43FD27}.Release|x64.Build.0 = Debug|Any CPU
Corrupted entries now fixed
{94562215-903C-47F3-BF64-8B90EF43FD27}.Release|x64.ActiveCfg = Release|x64
{94562215-903C-47F3-BF64-8B90EF43FD27}.Release|x64.Build.0 = Release|x64
I hope this helps someone.
It just happened to me that different projects were referencing different copies of the same dll.
I made sure all referenced the same file on disk, and the error disappeared as I expected.
Unloading and reloading the class library in Visual Studio solved this for me.
For me, this was caused by the project both directly and indirectly (through another dependency) referencing two different builds of Bouncy Castle that had different assembly names. One of the Bouncy Castle builds was the NuGet package, the other one was a debug build of the source downloaded from GitHub. Both were nominally version 1.8.1, but the project settings of the GitHub code set the assembly name to BouncyCastle whereas the NuGet package had the assembly name BouncyCastle.Crypto. Changing the project settings, thus aligning the assembly names, fixed the problem.
It didn't work for me when I've tried to add the reference from the .NET Assemblies tab.
It worked, though, when I've added the reference with BROWSE to C:\Windows\Microsoft.NET\Framework\v4.0.30319
I had this issue on a newly created solution that used existing projects. For some reason, one project could not "see" one other project, even though it had the same reference as every other project, and the referenced project was also building. I suspect that it was failing to detect something having to do with multiple target frameworks, because it was building in one framework but not the other.
Cleaning and rebuilding didn't work, and restarting VS didn't work.
What ended up working was opening a "Developer Command Prompt for VS 2019" and then issuing a msbuild MySolution.sln command. This completed successfully, and afterwards VS started building successfully also.
one of main reason can be the property of DLL
you must before do any thing to check the specific version property if it true make it false
Reason:
maybe the source code joined with other (old)version when you build it , but this Library upgraded with new update the version now different in the Assembly Cash and your application forbidden to get new DLL ,and after disable specific version property your applacaten will be free to get the new version of DLL references
Maybe a library (DLL file) you are using requires another library. In my case, I referenced a library that contained a database entity model - but I forgot to reference the entity framework library.
This can also mean you use a library, which exposes (public) types that are defined in a library. Even when you do not use these specifically in your library (the one that doesn't build).
What this probably prevents is you writing code that uses a class (which in its signature has the types from a library not referenced) that you cannot use.
For me the reason why the error appeared was that the WebForm where the error was reported has been moved from another folder, but the name of its codefile class remained unchanged and didn't correspond to the actual path.
Initial state:
Original file path: /Folder1/Subfolder1/MyWebForm.aspx.cs
Original codefile class name: Folder1_Subfolder1_MyWebForm
After the file was moved:
File path: /Folder1/MyWebForm.aspx.cs
Codefile class name (unchanged, with the error shown): Folder1_Subfolder1_MyWebForm
The solution:
Rename your codefile class Folder1_Subfolder1_MyWebForm
to one corresponding with the new path: Folder1_MyWebForm
All at once - problem solved, no errors reporting..
The type 'Domain.tblUser' is defined in an assembly that is not
referenced. You must add a reference to assembly 'Domain,
Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'.
**Solved:**
Add reference of my domain library layer to my web app libary layer
Note: Make sure your references are correct according to you DI container
In my case this was because I used
Implicit Operator
between BLL and DAL classes.when I want to use BLL Layer In Application Layer I got this error.
I changed
implicit operator
to
explicit operator
it be OK.
Thanks
In my case the version of the dll referenced was actually newer than the one that I had before.
I just needed to roll back to the previous release and that fixed it.
I have a similar problem, and I remove the RuntimeFrameworkVersion, and the problem was fixed.
Try to remove 1.1.1 or
My problem was that the Output Type for one of my projects was set to Console Application. To fix this, I right-clicked the project, chose Properties, clicked the Application tab, and change Output Type (from Console Application) to Class Library. After I re-compiled, this error went away.
Clean your solution and rebuild worked for me (in Visual Studio, these are options you get when you right click in your solution explorer), the error is gone in my project.
I have project XTime.Sephaku.GenSync.Plugin that translates SAP IDocs to our internal DB structure. It builds fine, and if I put it's classes into a Console app, that app runs fine, so the plugin code is fine.
I then have Console project Tester, with a reference to the output assembly from the plugin, XTime.Sephaku.GenSync.Plugin*. It doesn't see any of the public types in the plugin, despite that assembly being freshly built, and the public types all visible in Object Browser. I have copy and pasted namespaces for using statements to make sure I don't have a typo. The namespaces and public types are also all visible in dotPeek's decompiled code.
It's like something is telling XTime.Sephaku.GenSync.Plugin to not allow other projects to use it's types.
*** See my Why do I get a warning icon when I add a reference to an MEF plugin project? for why I don't reference the project, but rather the assembly.
Converting my comment to an answer:
Your Tester project cannot have a higher version of .NET than the referenced plugin.
You need to make sure that the referencing project have a version of .Net that is equal or higher to the plugin's version.
you can red more about it here
I have a C# console application in Visual Studio 2010. It has a Main() method as well as a bunch of utility classes. I'd like those utility classes to be available to other solutions. From reading online it seems that I need to compile it as a Class Library (DLL). So here's what I did:
Went in Visual Studio to "Project > [ProjectName] Properties > Application" and changed "Output type" from "Console Application" to "Class Library"
Rebuilt; ProjectName.dll was created in bin/Debug.
Created a new Console Application
Solution Explorer > Add Reference > browse to ProjectName.DLL, select it.
However, neither IntelliSense nor the Object Browser could find the classes inside that DLL.
I tried recompiling several different Console Applications as Class Libraries and got the same result. I also noticed that it works if I initially create the solution as a Class Library, but not if I convert it to one later.
Any tips?
You do not need to build it as a dll. VS 2010 (and IIRC 2008) allow referencing exe assemblies. All you need is for they relevant types to be declared public - top-level classes defualt to internal if you don't add a specifier.
You can switch output type to Class library in project properties as well - then you will have an output as dll instead exe file
What I've always done (since this is what you do with C++ static libraries, which is what I normally use - though I think it has some advantages for C# too) is add the class library's project to the solution, then add a reference to it in the project (or projects) that uses it.
When you go to add a reference, the list of potential references includes items from the solution, so it should be fairly obvious what to do. You should then get intellisense for your library.
One advantage of doing things this way is that if you need to edit files in the library project, it's very straightforward because they are close to hand, and the project then gets rebuilt automatically when you compile the solution.
Make sure that the classes in your dll project are public.
At first, from the point of view of managed libraries it does not matter what kind of Output type is your managed library. I mean that you can successfully reference ConsoleApplication1.exe from ConsoleApplication2.exe project (so you have no reason to convert ConsoleApplication1.exe to ConsoleApplication1.dll).
At second, I've tried to reproduce your situation, but... without effect. My VS displays types/methods from ConsoleApplication1.dll. One reason I can suppose is that you have forgotten to set visibility modifier (public keyword) for your utility classes.
I have got a Visual Studio Solution containing several projects and have set up the references between the projects as project references.
When a reference to an assembly is added, the references' properties contain a setting for
Specific Version = True|False
This property is missing for project references. How can it be set? I'd like my solution to load any available assembly (no matter what version) in the bin folder.
I've had a problem when a workflow instance (Workflow Foundation) was deserialized and the dependencies were updated meanwhile.
I think the problem is that what you are asking is not possible directly with a project reference, I think that always implicitly turns into an 'explicit version', because of the nature of the link.
The way you could do this (calling the currently referenced project A, and the referencing project B):
Have the project you want to reference in your solution, just like you do now with the project reference
Explicitly set the dependency chain so the 'referenced' project is built first
Build the referenced project A once first manually
Create an assembly reference in project B to the results from the build in project A
Set the assembly reference to 'Specific Version = false'
The build order (dependency) will guarantee that A is always built before B, and B will reference it from the binary output directory of A.
(altho, it's a little brittle and I would not recommend it since it's easy to get wrong results if the settings are not all right, or the sun aligns with the stars wrong, or some such)
I might be misunderstanding your question, but when you add a project reference, the project's assembly is always loaded into any project that references it when the project is built. Therefore, you'll always have the latest available assembly in the bin folder for that project. VS treats projects differently than other assemblies in that regard.
You can add references to project output dlls instead of projects. Then you will be able to set Specific Version setting.
I have found the solution to my problem. It's described pretty detailed here.
The problem is not a matter of wrong project references, but more a de/serializing of workflow instances question.
Thanks to everybody who tried to help.