I have business layer in my solution. I added console project to the solution. Added necessary reference to console application. Created instances of classes in business layer. I'm using resharper so code looks correct.
when I try to build I get the error like
Error 127 The type or namespace name 'BusinessLayer' could not be found (are you missing a using directive or an assembly reference?) C:\ConsoleApplication\Program.cs 13 25
if I reference business layer from web project under the same solution it compiles, but with console it's not.
do you have any idea what can be the problem?
Add using BusinessLayer; in the top of your application, if you already did that, then try to clean and rebuild the solution.
Also make sure that both the library and the console application have the same .net framework version, for example both are 4.0 and not one of them 4.0 client profile...
You seem to confuse a library (project) reference and a using statement judging by your comment:
I have the reference at the top of the page.
You need both to add a reference (right-click your project's References folder in Solution Explorer > Add Reference...) and add a using directive at the top of the code file to import the required namespaces.
You'll have to add a reference to that assembly from your console project.
You add references at the project level not the solution level, so the reference you added to your web application doesn't help your console app.
Right click over your solution, configuration manager, you will see all projects, be sure that you have marked all necessary projects to build with right platform.
Hope it helps.
Rebuild the BusinessLayer class library and build your solution again.
Related
I have a Web Application consuming a WebService. My web application has 2 projects - Startup and Other projects. I am able to build my solution and also run it without any problem in my local machine.
My Other project has a dll referenced named crypto. It is strongly named dll. Now I trying to publish my web app using File System. However it fails. Following are the errors.
The type or namespace name crypto could not be found (are you missing a using directive or an assembly reference)
From my output window
C:\Windows\Microsoft.NET\Framework\v4.0.30319\Microsoft.Common.targets(1605,5): warning MSB3245: Could not resolve this reference. Could not locate the assembly "crypto". Check to make sure the assembly exists on disk. If this reference is required by your code, you may get compilation errors.
And finally it skips the Publish of website. Could anyone suggest me whats going on? Similarly I even had an WPF app and I was facing similar issue in Strongly Named dlls while creating Setup file. There I just put all the dlls in Special GAC folder and things worked. Here I am not sure.
Help would be appreciated.
Remove crypto dll from your projects, and add reference again , and be sure that crypto that you upload is exactly same as one you adding in reference. and then upload your project's dll again.
I have a C# project which has a namespace A. The output of the project is a library(dll). When I try to add a reference to this dll file from another project, I am not able to see the namespace A present in the dll. Is there anything that I should do while creating the dll file so as to see the namespace? Please help me in this regard at the earliest.
Thanks,
Rakesh.
Make sure that you are:
Adding a reference to the DLL in the consuming projects references setting.
Made your classes public.
Including a using statement at the top of your file, or referencing the full namespace to the type that your dependent project is consuming.
Project References:
Make sure the version of the .Net framework targeted by your dll matches that of the program you are trying to reference it from. For example, if you have an assembly which targets the 4.0 framework and you try to reference it from a project which is targeting an older version of the framework you can run into these weird problems where you can't find the types in the assembly.
I have tried all the suggestions below but still no joy.
I'm now trying a console application, and let me explain exactly what I'm doing.
I create a new console project in VS 2010
I add a number of references (dll's) some that aren't mine such as Castle.Winsor and N2 CMS dlls
in the console app I can add using statements indicating I am using name spaces within the referenced DLLs
I start writing code.
As soon as I compile all the code that uses the referenced DLLs immediately complains with "The type or namespace name '' could not be found (are you missing a using directive or an assembly reference?)"
I have tried setting the dlls to copy to local always, I have copied the DLL into the same directory, I have tried added reference by project and adding a reference to the DLL's themselves
I don't get this problem with a web application project or a ASP.net project they always work fine, only something that is compiled to an EXE like a console app or windows service.
there must be something I'm missing or I would have got this working by now.
Change the project Target to a non Client Profile target. Right click the Project and select Properties, you should see a list of Framework versions. As you are using VS2010, the Console project you've created by default targets .NET Framework 4.0 Client Profile, change that to .NET Framework 4.0.
Check if Copy Local is set to true for the referenced assembly.
First, as to your question, its hard to know exactly what you're doing wrong, but from the fact that you're using an underscore in an assembly name (and probably in namespaces and type names), it suggests you're rather new to the .NET world.
This suggests that you're adding references to other projects in your solution by browsing to the compiled assembly, rather than by adding a Project Reference. When adding a reference, you must select the Project tab rather than browsing for the assembly.
Even if you don't believe this is the issue, remove all references and re-add project references to make absolutely sure. Assumption, asses etc.
Once you've done that, I'd strongly suggest remove all the underscores from your types, namespaces and assemblies. You might want to go read the framework design guidelines, too.
Open your .Proj(Windows service project file) file in notepad and check whether your assembly location(data_object) is the same which you are pointing.
When you open .Proj file in notepad you can check for,
Project reference,
<ProjectReference Include="C:\StackOverflow\StackOverflow.csproj">
And if you giving dll or exe refrence then
<Reference Include="StackOverflow, Version=1.0.0.0, Culture=neutral, processorArchitecture=x86">
<SpecificVersion>False</SpecificVersion>
<ExecutableExtension>.exe</ExecutableExtension>
<HintPath>C:\StackOverflow\bin\Debug\StackOverflow.exe</HintPath>
</Reference>
I suggest you to give exact location including drive name like above example.
Other option you may try,
1. Clean and rebuild
2. Add Project reference if you already tried dll reference
3. Check whether the folder (referred assembly location) is Read Only then remove it.
In VS 2019, I had two projects, one C++ and other one C# Console in one solution file. When tried to add a dll reference through "Add reference", I was not able to see Browse button in "Reference Manager" window, to select dll file.
But when I created only C# Console app inside solution then I could add dll reference.
When I add a reference to my dll in Visual Studio project, I am able to use it, but when I compile my code or try to run it, I get an are you missing a using directive or an assembly reference?_ Error. I am able to confirm that I have the right using statement for my namespace and I am able to confirm that the dll is correctly loaded.
Anyone have any idea what I may not have right in this?
Go to project settings and make sure that you are not compiling the project for a .net version that includes the text "client profile".
I had just had an issue precisely like this, even if this is an old question thought I would add my 2c on what fixed it as none of the other answers helped:
For whatever reason, when I built the solution top to bottom a certain dll was not getting updated and output that held changed code. So while my solution had no visible errors, when you attempted to build, it was still referencing the old dll and started complaining.
It was simply a case of directly re-building the offending project and after that it picked up the latest dll and built happily.
This seemed to be a freak accident as no configuration had changed between when it worked / when it didn't.
Sometimes, JUST REBUILD THE SOLUTION.
The location of the DLL is important.
If you add a reference on your local machine to a DLL that is outside of your Visual Studio solution, it isn't necessarily copied into your solution files (depends on the type of solution/project).
If this is your problem, then you need to either put the DLL in the same path on the other machine, or copy it into your solution so it gets deployed along with the solution files, and change the reference.
You can also handle this with build instructions, but that might be beyond your aspirations at the moment.
Most likely your dll is referencing another dll that the client project is not referencing and your dll code is exposing a type or an interface from the 3rd dll to the client code.
If you post the exaCt message, we'll be able to help better.
Are you using .net 4.0?
If yes, this dll is probably not compatible with .net 4.0
In my case, the main project (WinForm) was configured Framework Target: FW 4.0 "client profile". I change to FW 4.0 and work perfect!!.
At first time i was looking in the referenced projects and they were ok, but de main project doesn't. I hope this help. Thank you.
In my case this compilation error has gone after adding the reference to Microsoft BCL Build Components via "Manage NuGet packages" context menu on problem project.
Before: I had project Main (console application) referencing project A (class library).
Project A had dependency on Microsoft BCL Build Components.
After: I started refactoring where I picked out several classes to the separate project New. It also depended on A. But the compilation error occurred on project New as if there was no reference New -> A (although Visual Studio didn't highlight allegedly not found interfaces and classes listed in the error list of compilation).
So I checked project A's dependencies and found there Microsoft BCL Build Components.
After adding it to New's dependencies everything worked fine.
The most interesting thing is that Main did not contain this dependency and it didn't need it.
Hope this helps.
You just Have to check your namespace of that class file again...it will work
I'm working on a C# 4.0 project in VS2010 and needed to use some older DLLs containing controls that were created in C# 3.5 on VS2008. When I first add the DLLs to the references, I was able to see the namespace via intellisense and create an instance of one of the controls, but when I go to build, it gives me the following error:
The type or namespace name 'BCA' could not be found (are you missing a using directive or an assembly reference?)
And I do have a using directive for that namespace already, which is now underlined in red, showing that VS cannot find it. And now, intellisense won't pick up that namespace at all.
I even tried added the controls to the toolbox (which worked) but then when I drag them to the GUI, it says that it cannot locate the DLL reference, even though it obviously knows where it is.
I even tried changing the target framework to 3.5, but still with the same results.
Any thoughts as to why this could be happening?
Edit - I've notice that in the csc.exe arguments that VS outputs, it does not have any /reference entries for the DLLs I'm trying to use. When I create the same basic project in VS2008, those entries exist. Also, I can successfully reference the DLLs in a DLL project in VS2010... it seems to just be WinForms projects that don't work.
Turns out that it was something to do with VS2010 defaulting to the .NET 4 client profile, as soon as I changed it to the regular profile it built fine. There's a day wasted...
view the target framework.. in my project, was 4.0 client profile, e the reference dll was in 4.0
I tried Build->Clean Solution and then could add the reference.
I used to have similar problem, but the profiles were not the issue, so the problem was that my class library use a special NuGet package that has Dependency... so I install the dependency package in the target project and added the project reference and works!
But I am not sure if there is a better solution for this problem??? for me VS should be smart enough to carry those dlls along with the references. (I already verified that "Copy Local" is set to True)