问c# dotNetCore -动态编译代码错误

EN

using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.CSharp;
using Microsoft.CodeAnalysis.Emit;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;

public class CodeCompiler
{

    Assembly TranslateCode(string code, ref string err)
    {
        Assembly asse = null;

        Assembly[] asses = AppDomain.CurrentDomain.GetAssemblies();
        List<MetadataReference> metadataReferences = new List<MetadataReference>();
        PortableExecutableReference portable = null;
        int len = asses.Length;
        int num = 0;
        Assembly item = null;
        while (num < len)
        {
            try
            {
                item = asses[num];
                if (string.IsNullOrEmpty(item.Location)) continue;
                portable = MetadataReference.CreateFromFile(item.Location);
                metadataReferences.Add(portable);
            }
            catch (Exception)
            {

                //throw;
            }
            finally
            {
                num++;
            }
        }
            
        var references1 = metadataReferences.ToArray(); 

        string assemblyName = Path.GetRandomFileName();

        SyntaxTree syntaxTree = CSharpSyntaxTree.ParseText(code);
            
        CSharpCompilation compilation = CSharpCompilation.Create(
            assemblyName,
            syntaxTrees: new[] { syntaxTree },
            references: references1, 
            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());
                    err += string.Format("{0}: {1}", diagnostic.Id, diagnostic.GetMessage())+"\r\n";
                }
            }
            else
            {
                // The assembly is loaded from memory when the compilation is successful
                ms.Seek(0, SeekOrigin.Begin);
                asse = Assembly.Load(ms.ToArray());
            }
        }

        return asse;
    }

}