C# ASP.NET MVC 4 Web API XmlDocumentationProvider error

Question

When working with a Web API template in an ASP.NET MVC 4 project, trying to compile I get this error:

'Solution.Web.Api.Areas.HelpPage.XmlDocumentationProvider' does not implement interface member 'System.Web.Http.Description.IDocumentationProvider.GetResponseDocumentation (System.Web.Http.Controllers.HttpActionDescriptor)'

It seems the class doesn't implement all interface methods. However, I didn't create any code yet or apply any code change to the default project.

Would you know what is causing this problem?

Alberto, if you start a new project I'd recommend moving to MVC/Web API 5.12. — Yishai Galatzer
– Yishai Galatzer, Commented Apr 26, 2014 at 19:22
I have fixed it by deleting the file in this way. stackoverflow.com/a/51184698/4627336 — Dharmendra Prajapati
– Dharmendra Prajapati, Commented Jul 5, 2018 at 7:10

piercebot · Accepted Answer · 2015-01-16 15:49:21Z

17

Mark's answer to update the Web API Help Page worked for me. Here are the commands I ran to make it happen:

In Visual Studio 2013:

TOOLS -> Library Package Manager -> Package Manager Console
Paste the following into the Package Manager Console:

Update-Package Microsoft.AspNet.WebApi.HelpPage

Hit Enter, cross fingers, and post alternative solutions if you find them!

answered Jan 16, 2015 at 15:49

piercebot

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Mark van Straten · Accepted Answer · 2014-04-25 19:06:08Z

3

The error is somewhere in the Web Api HelpPage. This is just a nuget package which will install the /Area/Help stuff. I guess that it should be updated?

Try what happens if you uninstall the Microsoft.AspNet.WebApi.HelpPage and re-install it. Note; if after uninstall of the package the /Area/Help/** files are not removed delete those manually, they will be returned upon reinstall.

answered Apr 25, 2014 at 19:06

Mark van Straten

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1 Comment

Peter PitLock Over a year ago

After almost giving up and having reinstalled : this part saved me "if after uninstall of the package the /Area/Help/** files are not removed delete those manually"

Thomas · Accepted Answer · 2014-04-25 17:40:43Z

2

Make sure you controller inherits from ApiController and not just Controller.

answered Apr 25, 2014 at 17:40

Thomas

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Pramit Parekh · Accepted Answer · 2016-10-10 06:58:19Z

0

I got the same problem when getting Microsoft.AspNet.WebApi.

At Nuget Package Manager Console write this:

Update-Package -ProjectName 'YourProjectNameGoesHere' -Reinstall This will update all your packages and it will solve your problem.I hope it helps

answered Oct 10, 2016 at 6:58

Pramit Parekh

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1 Comment

Si8 Over a year ago

I still have the same issue

Sandeep Choudhary · Accepted Answer · 2017-12-01 21:16:15Z

0

Match your package versions install the pre release version of help too:

Install-Package Microsoft.AspNet.WebApi.HelpPage -Pre

I hope this helps.

answered Dec 1, 2017 at 21:16

Sandeep Choudhary

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