Execute user's code using CodeAnalysis CSharpScript (.NET Core)

Question

I'm trying to execute simple user's formula.

I'm using MS VS 2017 15.2 (26430.16), .NET Core 1.1.

I followed: https://github.com/dotnet/roslyn/wiki/Scripting-API-Samples

I created ASP.NET Core Web App, added NuGet package:

Install-Package Microsoft.CodeAnalysis.CSharp.Scripting

But after that the app gave an error:

An unhandled exception occurred while processing the request.
ArgumentException: Must include private members unless emitting a ref assembly.
Parameter name: IncludePrivateMembers
Microsoft.CodeAnalysis.Compilation.Emit(Stream peStream, Stream pdbStream, Stream xmlDocumentationStream, Stream win32Resources, IEnumerable<ResourceDescription> manifestResources, EmitOptions options, IMethodSymbol debugEntryPoint, Stream sourceLinkStream, IEnumerable<EmbeddedText> embeddedTexts, Stream metadataPEStream, CancellationToken cancellationToken)

After I added

using Microsoft.CodeAnalysis.CSharp.Scripting;

for

object result = CSharpScript.EvaluateAsync("1 + 2");

but it wasn't seen, so I added

<PackageReference Include="Microsoft.CodeAnalysis.CSharp.Scripting" Version="2.3.1" />

in "MyProject.csproj".

But I have the same error.

Can somebody help me?

Update 1:

Stack:

Microsoft.CodeAnalysis.Compilation.Emit(Stream peStream, Stream pdbStream, Stream xmlDocumentationStream, Stream win32Resources, IEnumerable<ResourceDescription> manifestResources, EmitOptions options, IMethodSymbol debugEntryPoint, Stream sourceLinkStream, IEnumerable<EmbeddedText> embeddedTexts, Stream metadataPEStream, CancellationToken cancellationToken)
Microsoft.AspNetCore.Mvc.Razor.Internal.DefaultRoslynCompilationService.Compile(RelativeFileInfo fileInfo, string compilationContent)
Microsoft.AspNetCore.Mvc.Razor.Internal.RazorCompilationService.Compile(RelativeFileInfo file)
Microsoft.AspNetCore.Mvc.Razor.Internal.CompilerCache.CreateCacheEntry(string relativePath, string normalizedPath, Func<RelativeFileInfo, CompilationResult> compile)
System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
Microsoft.AspNetCore.Mvc.Razor.Internal.CompilerCache.GetOrAdd(string relativePath, Func<RelativeFileInfo, CompilationResult> compile)
Microsoft.AspNetCore.Mvc.Razor.Internal.DefaultRazorPageFactoryProvider.CreateFactory(string relativePath)
Microsoft.AspNetCore.Mvc.Razor.RazorViewEngine.CreateCacheResult(HashSet<IChangeToken> expirationTokens, string relativePath, bool isMainPage)
Microsoft.AspNetCore.Mvc.Razor.RazorViewEngine.OnCacheMiss(ViewLocationExpanderContext expanderContext, ViewLocationCacheKey cacheKey)
Microsoft.AspNetCore.Mvc.Razor.RazorViewEngine.LocatePageFromViewLocations(ActionContext actionContext, string pageName, bool isMainPage)
Microsoft.AspNetCore.Mvc.Razor.RazorViewEngine.FindView(ActionContext context, string viewName, bool isMainPage)
Microsoft.AspNetCore.Mvc.ViewEngines.CompositeViewEngine.FindView(ActionContext context, string viewName, bool isMainPage)
Microsoft.AspNetCore.Mvc.ViewFeatures.Internal.ViewResultExecutor.FindView(ActionContext actionContext, ViewResult viewResult)
Microsoft.AspNetCore.Mvc.ViewResult+<ExecuteResultAsync>d__26.MoveNext()
System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker+<InvokeResultAsync>d__30.MoveNext()
System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker+<InvokeNextResultFilterAsync>d__28.MoveNext()
System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Rethrow(ResultExecutedContext context)
Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Next(ref State next, ref Scope scope, ref object state, ref bool isCompleted)
Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker+<InvokeNextResourceFilter>d__22.MoveNext()
System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Rethrow(ResourceExecutedContext context)
Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Next(ref State next, ref Scope scope, ref object state, ref bool isCompleted)
Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker+<InvokeAsync>d__20.MoveNext()
System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
Microsoft.AspNetCore.Builder.RouterMiddleware+<Invoke>d__4.MoveNext()
System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
Microsoft.VisualStudio.Web.BrowserLink.BrowserLinkMiddleware+<ExecuteWithFilter>d__7.MoveNext()
System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware+<Invoke>d__7.MoveNext()

Update 2:

Finally I did it this way (without packages):

string user_code = "1 + 2";
string code = $"int? r = {user_code};";
string codeToCompile = @"using System;
namespace RoslynCompile
{
    public class Calculator
    {
        public int? Calculate()
        {
            " + code + @"
            return r;
        }
    }
}";
SyntaxTree syntaxTree = CSharpSyntaxTree.ParseText(codeToCompile);
string assemblyName = Path.GetRandomFileName();
MetadataReference[] references = new MetadataReference[]
{
MetadataReference.CreateFromFile(typeof(object).GetTypeInfo().Assembly.Location)
};
CSharpCompilation compilation = CSharpCompilation.Create(
    assemblyName,
    syntaxTrees: new[] { syntaxTree },
    references: references,
    options: new CSharpCompilationOptions(OutputKind.DynamicallyLinkedLibrary));
using (var ms = new MemoryStream())
{
    EmitResult emitResult = compilation.Emit(ms);
    if (!emitResult.Success)
    {
        // some errors
        IEnumerable<Diagnostic> failures = emitResult.Diagnostics.Where(diagnostic =>
            diagnostic.IsWarningAsError ||
            diagnostic.Severity == DiagnosticSeverity.Error);
    }
    else
    {
        ms.Seek(0, SeekOrigin.Begin);
        Assembly assembly = AssemblyLoadContext.Default.LoadFromStream(ms);
        var type = assembly.GetType("RoslynCompile.Calculator");
        var instance = assembly.CreateInstance("RoslynCompile.Calculator");
        var meth = type.GetMember("Calculate").First() as MethodInfo;
        // get result
        int? result = meth.Invoke(instance, null) as int?;
    }
}

What's the stack trace?

SLaks
– SLaks

2017-07-21 13:32:05 +00:00
Commented Jul 21, 2017 at 13:32 — SLaks
– SLaks, Commented Jul 21, 2017 at 13:32

Kieron · Accepted Answer · 2017-07-23 06:01:09Z

2

I'm not sure what causes this error, but we rolled back to v2.2.0 of the Microsoft.CodeAnalysis.CSharp package.

It seems to have started happening since v2.3.0. At the time of writing, v2.3.1 is out, and still causes this problem.

Check out the issue on GitHub.

answered Jul 23, 2017 at 6:01

Kieron

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