加载由 Roslyn 编译器生成的程序集

Question

我正在使用 Roslyn 编译器生成 Greeter.dll。尝试加载 DLL 文件时出现我的问题。

代码如下：

using System;

using Roslyn.Compilers;
using Roslyn.Compilers.CSharp;

using System.IO;
using System.Reflection;
using System.Linq;

namespace LoadingAClass
{
    class Program
    {
        static void Main(string[] args)
        {
            var syntaxTree = SyntaxTree.ParseCompilationUnit(@"
class Greeter
{
    static void Greet()
    {
        Console.WriteLine(""Hello, World"");
    }
}");

            var compilation = Compilation.Create("Greeter.dll",
                syntaxTrees: new[] { syntaxTree },
                references: new[] {
                    new AssemblyFileReference(typeof(object).Assembly.Location),
                    new AssemblyFileReference(typeof(Enumerable).Assembly.Location),
                });

            Assembly assembly;
            using (var file = new FileStream("Greeter.dll", FileMode.Create))
            {
                EmitResult result = compilation.Emit(file);
            }

            assembly = Assembly.LoadFile(Path.Combine(Directory.GetCurrentDirectory(), @"Greeter.dll"));
            Type type = assembly.GetType("Greeter");
            var obj = Activator.CreateInstance(type);

            type.InvokeMember("Greet",
                BindingFlags.Default | BindingFlags.InvokeMethod,
                null,
                obj,
                null);

            Console.WriteLine("<ENTER> to continue");
            Console.ReadLine();

        }
    }
    // Thanks, http://blogs.msdn.com/b/csharpfaq/archive/2011/11/23/using-the-roslyn-symbol-api.aspx
}

错误信息出现在assembly = Assembly.LoadFile(Path.Combine(Directory.GetCurrentDirectory(), @"Greeter.dll"));这一行，内容为

Im Modul wurde ein Assemblymanifest erwartet。 (Ausnahme von HRESULT: 0x80131018)

大致翻译成

模块中应有程序集清单。

有人知道我在这里缺少什么吗？

Answer 1

我偶然发现了这一点，即使你有一个公认的答案，我认为它总体上没有帮助。所以，我将把它留在这里，供像我这样的未来搜索者使用。

代码的问题在于两件事，通过查看来自

的返回值你会发现

EmitResult result = compilation.Emit(file);

如果您查看 EmitResult 对象的属性，您会发现 results.Diagnostics 成员中有 2 个错误。

1. 找不到主要方法
2. 找不到类控制台

所以，要解决这个问题， 1.需要将输出标记为dll 2.您需要添加'using System;'到您传递给 API 的代码或说“System.Console.WriteLine”

以下代码可以通过更改来解决这两个问题：

        var outputFile = "Greeter.dll";
        var syntaxTree = SyntaxTree.ParseCompilationUnit(@"
 // ADDED THE FOLLOWING LINE
using System;

class Greeter
{
    public void Greet()
    {
        Console.WriteLine(""Hello, World"");
    }
}");
        var compilation = Compilation.Create(outputFile,
            syntaxTrees: new[] { syntaxTree },
            references: new[] {
                new AssemblyFileReference(typeof(object).Assembly.Location),
                new AssemblyFileReference(typeof(Enumerable).Assembly.Location),
            },

// ADDED THE FOLLOWING LINE
            options: new CompilationOptions(OutputKind.DynamicallyLinkedLibrary));

        using (var file = new FileStream(outputFile, FileMode.Create))
        {
            EmitResult result = compilation.Emit(file);
        }

        Assembly assembly = Assembly.LoadFrom("Greeter.dll");

        Type type = assembly.GetType("Greeter");
        var obj = Activator.CreateInstance(type);

        type.InvokeMember("Greet",
            BindingFlags.Default | BindingFlags.InvokeMethod,
            null,
            obj,
            null);

        Console.WriteLine("<ENTER> to continue");
        Console.ReadLine();

Answer 2

我一直在向O2 Plarform 添加 Roslyn 支持，这里是您如何使用它的 Roslyn 支持来编译（代码）、创建（和汇编）和调用（其方法）一行代码：

return @"using System; class Greeter { static string Greet() {  return ""Another hello!!""; }}"
        .tree().compiler("Great").create_Assembly().type("Greeter").invokeStatic("Greet"); 

//O2Ref:O2_FluentSharp_Roslyn.dll

这是一个执行代码 sn-p 的版本，看起来像你的（我添加了一个返回值）：

panel.clear().add_ConsoleOut();
var code = @"
using System;
class Greeter
{
    static string Greet()
    { 
        Console.WriteLine(""Hello, World""); 
        return ""hello from here"";
    }
}";
var tree = code.astTree();
if (tree.hasErrors())
    return tree.errors();   

var compiler = tree.compiler("Great")
                   .add_Reference("mscorlib");

if (compiler.hasErrors()) 
    return compiler.errors();    

var assembly  =tree.compiler("Great")
                   .create_Assembly();

return assembly.type("Greeter")
               .invokeStatic("Greet"); 

//O2Ref:O2_FluentSharp_Roslyn.dll
//O2File:_Extra_methods_Roslyn_API.cs
//O2File:API_ConsoleOut.cs

有关此外观的更多详细信息和屏幕截图，请参阅此博客文章：1 line to compile, create and execute: O2 Script to use Roslyn to Dynamically compile and execute a method

更新：请参阅 http://blog.diniscruz.com/search/label/Roslyn 了解大量 Roslyn 相关帖子和工具（使用 O2 平台创建）

Answer 3

有一个用于参考的新 API，如下所示：

var compilation = Compilation.Create(outputFile,
    syntaxTrees: new[] { syntaxTree },
    references: new[] {
        new MetadataFileReference(typeof(object).Assembly.Location),
        new MetadataFileReference(typeof(Enumerable).Assembly.Location),
    },
    options: new CompilationOptions(OutputKind.DynamicallyLinkedLibrary)
);

这是 9 月最新的 Roslyn-CTP 2012...

Answer 4

这段代码运行良好：

using System;

using Roslyn.Compilers;
using Roslyn.Compilers.CSharp;

using System.IO;
using System.Reflection;
using System.Linq;

namespace LoadingAClass
{
    class Program
    {
        static void Main(string[] args)
        {
            var syntaxTree = SyntaxTree.ParseCompilationUnit(@"
using System;
namespace HelloWorld
{
    class Greeter
    {
        public static void Greet()
        {
            Console.WriteLine(""Hello, World"");
        }
    }
}");

            string dllPath = Path.Combine(Directory.GetCurrentDirectory(), "Greeter.dll");
            string pdbPath = Path.Combine(Directory.GetCurrentDirectory(), "Greeter.pdb");

            var compilation = Compilation.Create(dllPath,
                new CompilationOptions(
                    assemblyKind: AssemblyKind.DynamicallyLinkedLibrary
                ))
                .AddSyntaxTrees( syntaxTree )
                .AddReferences(new AssemblyFileReference(typeof(object).Assembly.Location))
                .AddReferences(new AssemblyFileReference(typeof(Enumerable).Assembly.Location));

            EmitResult result;

            using (FileStream dllStream = new FileStream(dllPath, FileMode.OpenOrCreate))
            using (FileStream pdbStream = new FileStream(pdbPath, FileMode.OpenOrCreate))
            {
                result = compilation.Emit(
                    executableStream: dllStream,
                    pdbFileName: pdbPath,
                    pdbStream: pdbStream);
            }

            if (result.Success)
            {
                //assembly = Assembly.LoadFile(Path.Combine(Directory.GetCurrentDirectory(), @"Greeter.dll"));
                Assembly assembly = Assembly.LoadFrom(@"Greeter.dll");

                Type type = assembly.GetType("HelloWorld.Greeter");
                var obj = Activator.CreateInstance(type);

                type.InvokeMember("Greet",
                    BindingFlags.Default | BindingFlags.InvokeMethod,
                    null,
                    obj,
                    null);
            }
            else
            {
                Console.WriteLine("No Go");
                Console.WriteLine(result.Diagnostics.ToString());
            }

            Console.WriteLine("<ENTER> to continue");
            Console.ReadLine();

        }
    }
    // Thanks, http://blogs.msdn.com/b/csharpfaq/archive/2011/11/23/using-the-roslyn-symbol-api.aspx
    // Thanks, http://social.msdn.microsoft.com/Forums/en-US/roslyn/thread/d620a4a1-3a90-401b-b946-bfa1fc6ad7a2
}

Answer 5

原来我需要创建一个 pdb 文件。

using (FileStream dllStream = new FileStream(dllPath, FileMode.OpenOrCreate))
using (FileStream pdbStream = new FileStream(pdbPath, FileMode.OpenOrCreate))
{
    result = compilation.Emit(
       executableStream: dllStream,
       pdbFileName: pdbPath,
       pdbStream: pdbStream);
}