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

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

The error message "The CodeDom provider type 'Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider' could not be located" usually occurs when the necessary NuGet package for the .NET Compiler Platform (Roslyn) is not installed or configured properly in your project.

To resolve this issue, follow these steps:

1. Ensure that you have installed the latest version of the Microsoft.CodeDom.Providers.DotNetCompilerPlatform NuGet package in your project. You can do this using the Package Manager Console in Visual Studio or the NuGet Package Manager.

2. Verify that the following line is added to your project's Web.config or App.config file, under the system.codedom section:

<compilers>
  <compiler language="c#;cs;csharp" extension=".cs" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=3.6.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
</compilers>

If the system.codedom section is not present in the configuration file, you can add it manually.

3. Clean and rebuild your solution to ensure that the changes take effect.

If the issue persists, you can try uninstalling and then reinstalling the Microsoft.CodeDom.Providers.DotNetCompilerPlatform NuGet package or upgrading to the latest version of the package. Additionally, ensure that all dependent packages are also up-to-date.

Examples

  1. "C# missing Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider fix"

    • Description: Explore solutions for resolving the error "The CodeDom provider type 'Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider' could not be located." This error often occurs in ASP.NET projects, and a common fix involves reinstalling the Microsoft.CodeDom.Providers.DotNetCompilerPlatform NuGet package.
    // Example: Reinstalling DotNetCompilerPlatform package in Package Manager Console
Install-Package Microsoft.CodeDom.Providers.DotNetCompilerPlatform -Version [desired_version]

  2. "C# Visual Studio missing compiler provider error"

    • Description: Learn how to address the missing compiler provider error in Visual Studio. This issue can be resolved by ensuring the DotNetCompilerPlatform NuGet package is installed and properly configured in your project.
    // Example: Installing DotNetCompilerPlatform package via NuGet Package Manager
Install-Package Microsoft.CodeDom.Providers.DotNetCompilerPlatform

  3. "C# CodeDomProvider configuration in web.config"

    • Description: Understand how to configure the CodeDomProvider in the web.config file to resolve the missing provider type error. This example demonstrates adding the necessary configuration to the compilation section.
    <!-- Example: Adding CodeDomProvider configuration in web.config -->
<compilers>
  <compiler language="c#;cs;csharp" extension=".cs" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform" warningLevel="4" compilerOptions="/langversion:6 /nowarn:1659;1699;1701" />
</compilers>

  4. "C# Visual Studio update DotNetCompilerPlatform package"

    • Description: Learn how to update the DotNetCompilerPlatform NuGet package in Visual Studio to resolve issues with the missing CodeDom provider type.
    // Example: Updating DotNetCompilerPlatform package in Package Manager Console
Update-Package Microsoft.CodeDom.Providers.DotNetCompilerPlatform -Version [desired_version]

  5. "C# CodeDomProvider not working after project upgrade"

    • Description: Address issues with CodeDomProvider not working after upgrading a C# project. This may involve reinstalling or updating the DotNetCompilerPlatform package and checking for any breaking changes in the new version.
    // Example: Reinstalling DotNetCompilerPlatform package after project upgrade
Install-Package Microsoft.CodeDom.Providers.DotNetCompilerPlatform -Version [desired_version]

  6. "C# Microsoft.CodeDom.Providers.DotNetCompilerPlatform version compatibility"

    • Description: Understand version compatibility considerations when using Microsoft.CodeDom.Providers.DotNetCompilerPlatform. This may involve ensuring that the project's .NET Framework version aligns with the supported versions of the DotNetCompilerPlatform package.
    // Example: Checking project's .NET Framework version compatibility
- Verify that the project's target framework version is compatible with the DotNetCompilerPlatform package version
- Check the DotNetCompilerPlatform package documentation for version compatibility information

  7. "C# CodeDomProvider CodeDomProviderTypeNotFoundException"

    • Description: Troubleshoot and fix the CodeDomProviderTypeNotFoundException error in C#. This may involve reinstalling the DotNetCompilerPlatform package, updating the package version, and checking for any conflicts with other packages.
    // Example: Reinstalling DotNetCompilerPlatform package to address CodeDomProviderTypeNotFoundException
Install-Package Microsoft.CodeDom.Providers.DotNetCompilerPlatform -Version [desired_version]

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