CSharpCompilation.Emit（）在执行Roslyn API时抛出错误

Question

我正在尝试从Roslyn API构建一个动态链接库（DLL），它从原始文本输入构建一个语法树。

但是，我在发出编译结果时遇到异常。

此处抛出的异常是：

  

＆＃34;错误CS0234：类型或命名空间名称＆＃39;控制台＆＃39;命名空间中不存在＆＃39;系统＆＃39; （您是否缺少装配参考）＆＃34;

使用的.NET Framework ：4.7.1

应用类型：.NET Core 2.0控制台应用

以下是代码：

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Runtime.Loader;
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.CSharp;
using Microsoft.CodeAnalysis.CSharp.Scripting;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.Emit;

namespace RoslynCompileSample
{
    class Program
    {
        static void Main(string[] args)
        {
            string code = @"
                using System;
                namespace RoslynCompileSample
                {
                    public class Writer
                    {
                        public void Write(string message)
                        {
                            System.Console.WriteLine(message);
                        }
                    }
                }";
            SyntaxTree syntaxTree = CSharpSyntaxTree.ParseText(code, CSharpParseOptions.Default);

            var syntaxRoot = syntaxTree.GetRoot();
            var MyClass = syntaxRoot.DescendantNodes().OfType<ClassDeclarationSyntax>().First();
            var MyMethod = syntaxRoot.DescendantNodes().OfType<MethodDeclarationSyntax>().First();
            Console.WriteLine(MyClass.Identifier.ToString());
            Console.WriteLine(MyMethod.Identifier.ToString());

            string assemblyName = Path.GetRandomFileName();
            MetadataReference[] references = new MetadataReference[]
            {
                MetadataReference.CreateFromFile(typeof(object).Assembly.Location),
                MetadataReference.CreateFromFile(typeof(Enumerable).Assembly.Location)
            };

            CSharpCompilation compilation = CSharpCompilation.Create(
                assemblyName,
                syntaxTrees: new[] { syntaxTree },
                references: references,
                options: new CSharpCompilationOptions(OutputKind.DynamicallyLinkedLibrary));



            using (var ms = new MemoryStream())
            {
                EmitResult result = compilation.Emit(ms);

                if (!result.Success)
                {
                    IEnumerable<Diagnostic> failures = result.Diagnostics.Where(diagnostic =>
                        diagnostic.IsWarningAsError ||
                        diagnostic.Severity == DiagnosticSeverity.Error);

                    foreach (Diagnostic diagnostic in failures)
                    {
                        Console.Error.WriteLine("{0}: {1}", diagnostic.Id, diagnostic.GetMessage());
                    }
                }
                else
                {
                    ms.Seek(0, SeekOrigin.Begin);
                    Assembly assembly = Assembly.Load(ms.ToArray());

                    Type type = assembly.GetType("RoslynCompileSample.Writer");
                    object obj = Activator.CreateInstance(type);
                    type.InvokeMember("Write",
                        BindingFlags.Default | BindingFlags.InvokeMethod,
                        null,
                        obj,
                        new object[] { "Hello World" });
                }
            }
        }
    }
}

似乎无法弄明白，问题是什么。 System.Dll已添加到参考文献中。

感谢。