c# – 使用Roslyn时,Console不包含ReadKey的定义

我试图动态编译代码并在运行时执行它.所以我按照 http://www.tugberkugurlu.com/archive/compiling-c-sharp-code-into-memory-and-executing-it-with-roslyn作为指导.

示例中给出的代码完美地起作用.但是,如果我使用Console.ReadKey(),它会给我错误CS0117：’Console’不包含’ReadKey’的定义.我在某处读到这是因为dotnet核心不支持ReadKey(‘Console’ does not contain a definition for ‘ReadKey’ in asp.net 5 console App),但我目前正在使用“Microsoft.NETCore.App”,如果我在代码中显式使用它而不是使用Roslyn,则Console.ReadKey()可以正常工作.

>这是罗斯林的问题还是我做错了什么？
>“Microsoft.NETCore.App”和dotnet核心是一回事吗？我怀疑我可能正在使用其他东西作为我的目标(允许我使用ReadKey)和dotnet核心与Roslyn
>是否有可能将罗斯林的目标改为其他目标？

提前致谢.

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.Emit;

namespace DemoCompiler
{
    class Program
    {
        public static void roslynCompile()
        {
            string code = @"
    using System;
    using System.Text;

    namespace RoslynCompileSample
    {
        public class Writer
        {
            public void Write(string message)
            {
                Console.WriteLine(message);
                Console.ReadKey();
            }
        }
    }";
            SyntaxTree SyntaxTree = CSharpSyntaxTree.ParseText(code);

            string assemblyName = Path.GetRandomFileName();
            MetadataReference[] references = new MetadataReference[]
            {
                MetadataReference.CreateFromFile(typeof(object).GetTypeInfo().Assembly.Location),MetadataReference.CreateFromFile(typeof(Enumerable).GetTypeInfo().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 = AssemblyLoadContext.Default.LoadFromStream(ms);
                    var type= assembly.GetType("RoslynCompileSample.Writer");
                    var instance = assembly.CreateInstance("RoslynCompileSample.Writer");
                    var meth = type.GetMember("Write").First() as MethodInfo;
                    meth.Invoke(instance,new [] {assemblyName});
                }
            }

        }
    }
}

编辑：我试图引用System.Console.dll,但我和System.Private.CoreLib之间发生冲突.我该如何解决？

解决方法

@H_502_24@ 一种方法是将< PreserveCompilationContext> true< / PreserveCompilationContext> *添加到项目文件中,然后使用Microsoft.Extensions.DependencyModel.DependencyContext获取当前项目的所有参考程序集：

var references = DependencyContext.Default.CompileLibraries
    .SelectMany(l => l.ResolveReferencePaths())
    .Select(l => MetadataReference.CreateFromFile(l));

这似乎可以避免您获得的错误,但会导致以下警告：

warning CS1701: Assuming assembly reference ‘System.Runtime,Version=4.0.0.0,Culture=neutral,PublicKeyToken=b03f5f7f11d50a3a’ used by ‘System.Console’ matches identity ‘System.Runtime,Version=4.1.0.0,PublicKeyToken=b03f5f7f11d50a3a’ of ‘System.Runtime’,you may need to supply runtime policy

As far as I can tell,this should not be an issue.

*这假设您正在使用csproj / VS2017.如果您仍在使用project.json / VS2015,则可以使用“buildOptions”完成相同的操作：{“preserveCompilationContext”：true}.