ASP.Net MVC Controller cannot see another namespace

Question

I have an MVC Controller that cannot see another namespace in the using statement.

Specifically this line of code:

using TRN.Website.Tools;

Errors with:

The type or namespace name 'Tools' does not exist in the namespace 'TRN.Website' (are you missing an assembly reference?)

Other parts of my project can see the TRN.Website.Tools namespace however.

I tried adding the namespace to web.config but this had no effect.

EDIT: Sorry all I have missed out a vital bit of information. TRN.Website.Tools is just a folder with the namespace TRN.Website.Tools in the same project. It is not a separate project or a dll.

Are you missing an assembly reference?

CodeCaster
– CodeCaster

2013-12-30 10:39:13 +00:00
Commented Dec 30, 2013 at 10:39 — CodeCaster
– CodeCaster, Commented Dec 30, 2013 at 10:39
Have you import the dll into your project references?

kostas ch.
– kostas ch.

2013-12-30 10:41:15 +00:00
Commented Dec 30, 2013 at 10:41 — kostas ch.
– kostas ch., Commented Dec 30, 2013 at 10:41

Mahmood Dehghan Tazereh · Accepted Answer · 2013-12-30 10:41:21Z

3

My guess: You have multiple projects in you solution and you have multiple libraries (dlls) that their names starts with TRN.Website and you added reference to one of these dlls in your MVC project. you have to add reference to the other one too.

answered Dec 30, 2013 at 10:41

Mahmood Dehghan Tazereh

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Comments

Three Value Logic · Accepted Answer · 2013-12-30 11:05:17Z

3

Solved but in a really strange way.

I added another class in the Tools folder and after that the error disappeared.

Very very odd.

answered Dec 30, 2013 at 11:05

Three Value Logic

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khcpietro · Accepted Answer · 2014-08-26 12:36:29Z

3

Check your Build Action of your class in properties window. It must be 'Compile'.

answered Aug 26, 2014 at 12:36

khcpietro

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1 Comment

douglas.kirschman Over a year ago

I even added the 'aspnet folder' App_Code and the class default action was set to content. Amazing that five years later (using MVC5) and stuff like this still trips us up.

Roy Dictus · Accepted Answer · 2013-12-30 10:49:30Z

2

Your ASP.NET MVC project does not contain a reference to the assembly that contains the TRN.Website.Tools namespace. You have to reference that from your ASP.NET MVC project in order to use it.

If TRN.Website.Tools is a project in your Solution, you can just add a Project reference to it.

If it isn't a project in your Solution, you'll have to add a reference to the compiled DLL to your ASP.NET MVC project.

answered Dec 30, 2013 at 10:49

Roy Dictus

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1 Comment

Three Value Logic Over a year ago

Accepted as while this did not solve my problem it was a well written answer that will help others.

Merr Leader · Accepted Answer · 2020-06-29 15:30:22Z

0

In my case, I had not checked in the "X.csproj" file to TFS, so the new controller I created was not being found in my testing environments as a valid controller.

answered Jun 29, 2020 at 15:30

Merr Leader

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