''Could not find file ... bin\roslyn\csc.exe' [duplicate]
In Visual Studio 2017, when hitting Ctrl+F5 to run my ASP.NET Framework Web API server, I get:
Could not find file ... bin\roslyn\csc.exe:
Running
Update-Package Microsoft.CodeDom.Providers.DotNetCompilerPlatform -r
in the package manager console is not a permanent fix in the sense
that the server error appears again when the package files are
missing.
How can I get rid of this error once and for all so that the needed
packages are automatically (and silently) reinstalled as soon as I
reopen, build, and run my Visual Studio solution?
Code to reproduce the error:
https://user.it.uu.se/~hesc0353/SrvrErr-reproduce.zip
(Originally from
https://github.com/aspnet/AspNetDocs/tree/master/aspnet/web-api/overview/advanced/calling-a-web-api-from-a-net-client/sample/server/ProductsApp)
Solution 1:[1]
As you already mention,
the quick fix is to use the package manager,
Tools
> Nuget Package Manager
> Package Manager Console
, to run
Update-Package Microsoft.CodeDom.Providers.DotNetCompilerPlatform -r
as pointed out by https://stackoverflow.com/questions/32780315#34391473
But an alternative solution (which I consider to be more robust) is to remove an attribute of your project's Web.config
file.
(Web.config
is in the same directory as your .csproj
file.)
Open the Web.config
file in a text editor (or inside Visual Studio).
- In the tag configuration | system.codedom | compilers | compiler language="c#;cs;csharp"
, completely remove the type
attribute.
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<!-- ... -->
<system.codedom>
<compilers>
<compiler language="c#;cs;csharp" extension=".cs"
type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=1.0.5.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
warningLevel="4" compilerOptions="/langversion:default /nowarn:1659;1699;1701"/>
<compiler language="vb;vbs;visualbasic;vbscript" extension=".vb"
type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.VBCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=1.0.5.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
warningLevel="4" compilerOptions="/langversion:default /nowarn:41008 /define:_MYTYPE=\"Web\" /optionInfer+"/>
</compilers>
</system.codedom>
</configuration>
In short, remove the line that starts with type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft
.
(Presumably, the same fix works for Visual Basic as well as for Csharp, but I have not tried it.)
Visual Studio will take care of the rest. No more Server Error in '/' Application
.
In the example code I provided in the zip file above you will now get HTTP Error 403
when you hit Ctrl+F5.
Try replacing http://localhost:64195
in your web browser with http://localhost:64195/api/products
.
The web API now displays as it should:
As a provocation, I even tried removing the whole package
directory of my Visual Studio solution.
It was automatically and silently recreated as soon as I (re-)built it.
Sources
This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.
Source: Stack Overflow
Solution | Source |
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Solution 1 |