C# Roslyn 编译 - 在动态编译的代码中使用 Nuget 包 - 编译但在运行时抛出异常无法加载文件或程序集

如何解决C# Roslyn 编译 - 在动态编译的代码中使用 Nuget 包 - 编译但在运行时抛出异常无法加载文件或程序集

我尝试使用 Roslyn 编译器在动态编译代码中使用 Nuget 包来完成。

我想在我的代码中使用 Nuget 包（在我的示例中 https://www.nuget.org/packages/TinyCsvParser/ ）。所以我下载了这个包并解压到一个文件夹（C:\Data\packages\tinycsvparser.2.6.1）

但我不希望它出现在我的应用程序直接依赖项中。所以它没有在项目本身中引用，我不想将它复制到 bin/Debug-Folder。

Nuget-Package-DLL 应该可以在我硬盘上的任何位置。

编译运行没有任何错误。但是在运行时在线 method.Invoke(fooInstance,null) 我得到以下异常：

Could not load file or assembly 'TinyCsvParser,Version=2.6.1.0,Culture=neutral,PublicKeyToken=d7df35b038077099' or one of its dependencies. The system cannot find the file specified.

我如何告诉程序它应该在哪里寻找 DLL？我用以下行尝试了

Assembly nugetAssembly = Assembly.LoadFrom(pathToNugetDLL);

但这并没有帮助。

感谢您提供有关如何解决此问题的任何建议。

这是我的代码（原型）：

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

namespace Playground
{
   public static class Program
   {
      private const string pathToNugetDLL = @"C:\Data\packages\tinycsvparser.2.6.1\lib\net45\TinyCsvParser.dll";

      private const string firstClass =
@"
using TinyCsvParser;

namespace A
{
    public class MyClass
    {
        public int MyFunction()
         {
            CsvParserOptions csvParserOptions = new CsvParserOptions(true,';');
            return 1;
         }
    }
}";

      public static void Main()
      {
         CSharpParSEOptions parSEOptions = new CSharpParSEOptions(LanguageVersion.CSharp7,DocumentationMode.Parse,SourceCodeKind.Regular);
         SyntaxTree parsedSyntaxTree = SyntaxFactory.ParseSyntaxTree(firstClass,parSEOptions);

         List<string> defaultNamespaces = new List<string>() { };

         //// Referenzen über Kommentare heraussuchen:
         List<MetadataReference> defaultReferences = CreateMetadataReferences();

         var encoding = Encoding.UTF8;

         var assemblyName = Path.GetRandomFileName();
         var symbolsName = Path.ChangeExtension(assemblyName,"pdb");
         var sourceCodePath = "generated.cs";

         var buffer = encoding.GetBytes(firstClass);
         var sourceText = SourceText.From(buffer,buffer.Length,encoding,canBeEmbedded: true);

         var SyntaxTree = CSharpSyntaxTree.ParseText(
             sourceText,new CSharpParSEOptions(),path: sourceCodePath);

         var SyntaxRootNode = SyntaxTree.GetRoot() as CSharpSyntaxNode;
         var encoded = CSharpSyntaxTree.Create(SyntaxRootNode,null,sourceCodePath,encoding);


         CSharpCompilationoptions defaultCompilationoptions =
               new CSharpCompilationoptions(OutputKind.DynamicallyLinkedLibrary)
                       .WithOverflowChecks(true).WithOptimizationLevel(OptimizationLevel.Debug).WithPlatform(Platform.Anycpu)
                       .WithUsings(defaultNamespaces);

         CSharpCompilation compilation = CSharpCompilation.Create(
             assemblyName,SyntaxTrees: new[] { encoded },references: defaultReferences,options: defaultCompilationoptions
         );

         using (var assemblyStream = new MemoryStream())
         using (var symbolsstream = new MemoryStream())
         {
            var emitOptions = new EmitOptions(
                    debuginformationFormat: DebuginformationFormat.Pdb,pdbFilePath: symbolsName);

            var embeddedTexts = new List<EmbeddedText> { EmbeddedText.FromSource(sourceCodePath,sourceText) };

            EmitResult result = compilation.Emit(
                pestream: assemblyStream,pdbStream: symbolsstream,embeddedTexts: embeddedTexts,options: emitOptions);


            if (result.Success)
            {
               Console.WriteLine("Complation succeeded!");
               try
               {
                  Assembly nugetAssembly = Assembly.LoadFrom(pathToNugetDLL);

                  var assembly = Assembly.Load(assemblyStream.ToArray(),symbolsstream.ToArray());
                  var type = assembly.GetType("A.MyClass");

                  MethodInfo method = type.getmethod("MyFunction");

                  var fooInstance = Activator.CreateInstance(type);
                  method.Invoke(fooInstance,null);
                  
               }
               catch (Exception ex)
               {
                  int i = 0;
               }
            }
         }
      }
      private static List<MetadataReference> CreateMetadataReferences()
      {
         string defaultPath = typeof(object).Assembly.Location.Replace("mscorlib","{0}");

         var MetadatenReferences = new List<MetadataReference>()
            {
                MetadataReference.CreateFromFile(string.Format(defaultPath,"mscorlib")),MetadataReference.CreateFromFile(string.Format(defaultPath,"System")),"System.Data")),"System.Core")),"System.ComponentModel.DataAnnotations")),"System.Xml")),"netstandard")),};

         string strExTradll = pathToNugetDLL;
         MetadatenReferences.Add(MetadataReference.CreateFromFile(strExTradll));

         return MetadatenReferences;
      }
   }
         
}

解决方法

我可以通过使用事件处理程序来解决问题

AppDomain.CurrentDomain.AssemblyResolve

有了它，我可以解决依赖关系。

这里是原型代码的最终结果：

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

namespace Playground
{
   public static class Program
   {

      public static void Main()
      {
         var test = new Test();
         test.TestMethod();
      }
   }
   public class Test

   {

      private const string pathToNugetDLL = @"C:\Data\packages\tinycsvparser.2.6.1\lib\net45\TinyCsvParser.dll";

      private const string firstClass =
@"
using TinyCsvParser;

namespace A
{
    public class MyClass
    {
        public int MyFunction()
         {
            CsvParserOptions csvParserOptions = new CsvParserOptions(true,';');
            return 1;
         }
    }
}";


      public void TestMethod()
      {
         CSharpParseOptions parseOptions = new CSharpParseOptions(LanguageVersion.CSharp7,DocumentationMode.Parse,SourceCodeKind.Regular);
         SyntaxTree parsedSyntaxTree = SyntaxFactory.ParseSyntaxTree(firstClass,parseOptions);

         List<string> defaultNamespaces = new List<string>() { };

         //// Referenzen über Kommentare heraussuchen:
         List<MetadataReference> defaultReferences = CreateMetadataReferences();

         var encoding = Encoding.UTF8;

         var assemblyName = Path.GetRandomFileName();
         var symbolsName = Path.ChangeExtension(assemblyName,"pdb");
         var sourceCodePath = "generated.cs";

         var buffer = encoding.GetBytes(firstClass);
         var sourceText = SourceText.From(buffer,buffer.Length,encoding,canBeEmbedded: true);

         var syntaxTree = CSharpSyntaxTree.ParseText(
             sourceText,new CSharpParseOptions(),path: sourceCodePath);

         var syntaxRootNode = syntaxTree.GetRoot() as CSharpSyntaxNode;
         var encoded = CSharpSyntaxTree.Create(syntaxRootNode,null,sourceCodePath,encoding);


         CSharpCompilationOptions defaultCompilationOptions =
               new CSharpCompilationOptions(OutputKind.DynamicallyLinkedLibrary)
                       .WithOverflowChecks(true).WithOptimizationLevel(OptimizationLevel.Debug).WithPlatform(Platform.AnyCpu)
                       .WithUsings(defaultNamespaces);

         CSharpCompilation compilation = CSharpCompilation.Create(
             assemblyName,syntaxTrees: new[] { encoded },references: defaultReferences,options: defaultCompilationOptions
         );

         using (var assemblyStream = new MemoryStream())
         using (var symbolsStream = new MemoryStream())
         {
            var emitOptions = new EmitOptions(
                    debugInformationFormat: DebugInformationFormat.Pdb,pdbFilePath: symbolsName);

            var embeddedTexts = new List<EmbeddedText> { EmbeddedText.FromSource(sourceCodePath,sourceText) };

            EmitResult result = compilation.Emit(
                peStream: assemblyStream,pdbStream: symbolsStream,embeddedTexts: embeddedTexts,options: emitOptions);


            if (result.Success)
            {
               Console.WriteLine("Complation succeeded!");
               try
               {
                  AppDomain.CurrentDomain.AssemblyResolve += AppDomain_AssemblyResolve;

                  Assembly nugetAssembly = Assembly.LoadFrom(pathToNugetDLL);

                  var assembly = Assembly.Load(assemblyStream.ToArray(),symbolsStream.ToArray());
                  var type = assembly.GetType("A.MyClass");

                  MethodInfo method = type.GetMethod("MyFunction");

                  var fooInstance = Activator.CreateInstance(type);
                  method.Invoke(fooInstance,null);

               }
               catch (Exception ex)
               {
                  int i = 0;
               }
               finally
               {
                  AppDomain.CurrentDomain.AssemblyResolve -= AppDomain_AssemblyResolve;
               }
            }
         }
      }


      private Assembly AppDomain_AssemblyResolve(object sender,ResolveEventArgs args)
      {
         string[] assemblyInfoSplitted = args.Name.Split(',');
         string strSearchedForAssemblyName = assemblyInfoSplitted[0];

         var fileInfo = new FileInfo(pathToNugetDLL);
         var strAssemblyName = Regex.Replace(fileInfo.Name,".dll","",RegexOptions.IgnoreCase);
         if (strSearchedForAssemblyName.ToLower() == strAssemblyName.ToLower())
         {
            //File.ReadAllBytes because DLL might be deleted afterwards in the filesystem
            return Assembly.Load(File.ReadAllBytes(pathToNugetDLL));
         }

         throw new Exception($"Could not resolve Assembly '{strSearchedForAssemblyName}'.");
      }

      private static List<MetadataReference> CreateMetadataReferences()
      {
         string defaultPath = typeof(object).Assembly.Location.Replace("mscorlib","{0}");

         var metadatenReferences = new List<MetadataReference>()
            {
                MetadataReference.CreateFromFile(string.Format(defaultPath,"mscorlib")),MetadataReference.CreateFromFile(string.Format(defaultPath,"System")),"System.Data")),"System.Core")),"System.ComponentModel.DataAnnotations")),"System.Xml")),"netstandard")),};

         string strExtraDll = pathToNugetDLL;
         metadatenReferences.Add(MetadataReference.CreateFromFile(strExtraDll));

         return metadatenReferences;
      }
   }

}

这里有两个问题：

编译
跑步

试试这个：

public class Test
{
    private const string firstClass =
@"
using TinyCsvParser;

namespace A
{
    public class MyClass
    {
        public int MyFunction()
         {
            CsvParserOptions csvParserOptions = new CsvParserOptions(true,';');
            return 1;
         }
    }
}";


    public void TestMethod()
    {
        var parseOptions = new CSharpParseOptions(LanguageVersion.CSharp7,SourceCodeKind.Regular);
        var parsedSyntaxTree = SyntaxFactory.ParseSyntaxTree(firstClass,parseOptions);

        var defaultReferences = CreateMetadataReferences();

        var encoding = Encoding.UTF8;

        var assemblyName = Path.GetRandomFileName();
        var symbolsName = Path.ChangeExtension(assemblyName,"pdb");
        var sourceCodePath = "generated.cs";

        var buffer = encoding.GetBytes(firstClass);
        var sourceText = SourceText.From(buffer,canBeEmbedded: true);

        var syntaxTree = CSharpSyntaxTree.ParseText(
            sourceText,path: sourceCodePath);

        var syntaxRootNode = syntaxTree.GetRoot() as CSharpSyntaxNode;
        var encoded = CSharpSyntaxTree.Create(syntaxRootNode,encoding);

        CSharpCompilationOptions defaultCompilationOptions =
              new CSharpCompilationOptions(OutputKind.DynamicallyLinkedLibrary)
                  .WithOverflowChecks(true)
                  .WithOptimizationLevel(OptimizationLevel.Debug)
                  .WithPlatform(Platform.AnyCpu);

        CSharpCompilation compilation = CSharpCompilation.Create(
            assemblyName,options: defaultCompilationOptions
        );

        using var assemblyStream = new MemoryStream();
        using var symbolsStream = new MemoryStream();

        var emitOptions = new EmitOptions(
                debugInformationFormat: DebugInformationFormat.Pdb,pdbFilePath: symbolsName);

        var embeddedTexts = new List<EmbeddedText> { EmbeddedText.FromSource(sourceCodePath,sourceText) };

        EmitResult result = compilation.Emit(
            peStream: assemblyStream,options: emitOptions);

        if (result.Success)
        {
            Console.WriteLine("Complation succeeded!");

            try
            {
                var assembly = Assembly.Load(assemblyStream.ToArray(),symbolsStream.ToArray());
                var type = assembly.GetType("A.MyClass");

                MethodInfo method = type.GetMethod("MyFunction");

                var fooInstance = Activator.CreateInstance(type);
                method.Invoke(fooInstance,null);

                Console.WriteLine("Invocation succeeded!");
            }
            catch (Exception ex)
            {
                Console.WriteLine($"Invocation failed!\n{ex}");
            }
        }
        else
        {
            Console.WriteLine("Complation failed!");

            foreach (var diagnostic in result.Diagnostics)
            {
                Console.WriteLine(diagnostic.ToString());
            }
        }
    }

    private static IEnumerable<MetadataReference> CreateMetadataReferences()
    {
        var tinyCsvParserAssembly = typeof(TinyCsvParser.CsvParserOptions).Assembly;

        var metadatenReferences = new Dictionary<string,MetadataReference>();

        GetReferenecedAssemblies(metadatenReferences,tinyCsvParserAssembly);

        return metadatenReferences.Values;

        static void GetReferenecedAssemblies(Dictionary<string,MetadataReference> references,Assembly assembly)
        {
            var assemblyName = assembly.FullName;

            if (!references.ContainsKey(assemblyName))
            {
                references.Add(assemblyName,MetadataReference.CreateFromFile(assembly.Location));

                foreach (var referencedAssembly in assembly.GetReferencedAssemblies())
                {
                    GetReferenecedAssemblies(references,Assembly.Load(referencedAssembly));
                }
            }
        }
    }
}