The CodeDom provider type "Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider" could not be located

c# asp.net asp.net-web-api msbuild
cscmh99 picture cscmh99 · Oct 24, 2015 · Viewed 241.9k times · Source

It's a WebApi project using VS2015.

Step to reproduce:

  1. Create an empty WebApi project
  2. Change Build output path from "bin\" to "bin\Debug\"
  3. Run

enter image description here

Everything is working perfectly until I changed Build Output path from "bin\" to "bin\Debug\" In fact, any Output path other than "bin\" won't work.

One little additional thing is that, having another output path to anywhere would work as long as I left a build in "bin\".

Please help providing solution to solve this. I guess that'll cost problem on actual deployment.

Answer

vibs2006 picture vibs2006 · Mar 8, 2017

If your project has Roslyn references and you are deploying it on an IIS server, you might get unwanted errors on the website as many hosting providers still have not upgraded their servers and hence do not support Roslyn.

To resolve this issue, you will need to remove the Roslyn compiler from the project template. Removing Roslyn shouldn't affect your code's functionality. It worked fine for me and some other projects (C# 4.5.2) on which I worked.

Do the following steps:

  1. Remove from following Nuget Packages using command line shown below (or you can use GUI of Nuget Package manager by Right Clicking on Root Project Solution and removing them).

    PM> Uninstall-package Microsoft.CodeDom.Providers.DotNetCompilerPlatform
PM> Uninstall-package Microsoft.Net.Compilers

  2. Remove the following code from your Web.Config file and restart IIS. (Use this method only if step 1 doesn't solve your problem.)

    <system.codedom>
<compilers>
  <compiler language="c#;cs;csharp" extension=".cs" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:6 /nowarn:1659;1699;1701" />
  <compiler language="vb;vbs;visualbasic;vbscript" extension=".vb" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.VBCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:14 /nowarn:41008 /define:_MYTYPE=\&quot;Web\&quot; /optionInfer+" />
</compilers>

Related questions

POSTing JsonObject With HttpClient From Web API

I'm trying to POST a JsonObject using HttpClient from Web API. I'm not quite sure how to go about this and can't find much in the way of sample code. Here's what I have so far: var myObject = (dynamic)new …

Read More
How to return a file (FileContentResult) in ASP.NET WebAPI

In a regular MVC controller, we can output pdf with a FileContentResult. public FileContentResult Test(TestViewModel vm) { var stream = new MemoryStream(); //... add content to the stream. return File(stream.GetBuffer(), "application/pdf", "test.pdf"); } But how can we change it …

Read More
Failed to serialize the response in Web API with Json

I am working with ASP.NET MVC 5 Web Api. I want consult all my users. I wrote api/users and I receive this: "The 'ObjectContent`1' type failed to serialize the response body for content type 'application/json; charset=utf-8…

Read More