.net - 程序集未正确保存

Question

我有一些非常简单的代码来生成程序集并在包含的类型上调用方法。该方法被调用并正确运行，但是当我使用反射器查看生成的程序集时，我看不到类型。

下面是示例代码：

namespace ConsoleApplication2
{
    class Proggy
    {
        public static void Main(string[] args)
        {
            var ab = AppDomain.CurrentDomain.DefineDynamicAssembly(
                new AssemblyName() { Name = "MyAssembly" },
                AssemblyBuilderAccess.RunAndSave);
            var module = ab.DefineDynamicModule(ab.GetName().Name);
            var typeBuilder = module.DefineType("MyType");
            var ctr = typeBuilder.DefineConstructor(MethodAttributes.Public, 
                CallingConventions.Standard, Type.EmptyTypes);
            var ilgc = ctr.GetILGenerator();
            ilgc.Emit(OpCodes.Ldarg_0);
            ilgc.Emit(OpCodes.Call, typeof(object).GetConstructor(Type.EmptyTypes));
            ilgc.Emit(OpCodes.Ret);
            var method = typeBuilder.DefineMethod("MyMethod", MethodAttributes.Public,
                typeof(int), new[] { typeof(string) });
            var ilg = method.GetILGenerator();
            ilg.Emit(OpCodes.Ldarg_1);
            ilg.EmitCall(OpCodes.Callvirt, typeof(string).GetProperty("Length").GetGetMethod(),
                null);
            ilg.Emit(OpCodes.Ret);
            var type = typeBuilder.CreateType();
            ab.Save("mytestasm.dll");
            var inst = Activator.CreateInstance(type);
            Console.WriteLine(type.InvokeMember("MyMethod", BindingFlags.InvokeMethod, null, inst,
                new[] { "MyTestString" }));
            Console.ReadLine();
        }
    }
}

这是Reflector的相应反汇编：

.assembly MyAssembly
{
    .ver 0:0:0:0
    .hash algorithm 0x00008004
}
.module RefEmit_OnDiskManifestModule
// MVID: {0B944140-58D9-430E-A867-DE0AD0A8701F}
// Target Runtime Version: v2.0.50727

... 和 ...

{
    .class private auto ansi <Module>
    {
    }
}

谁能帮我正确保存程序集？

Answer 1

诀窍是在 AssemblyBuilder 实例上使用 DefineDynamicModule 方法的“持久模块”版本。也就是说，而不是：

var module = ab.DefineDynamicModule(ab.GetName().Name);

使用类似的东西：

var module = ab.DefineDynamicModule(ab.GetName().Name, ab.GetName().Name + ".mod");

此后相应的模块在保存后出现在程序集中。

Answer 2

我不确定为什么没有添加该类型。

然而，另一种方法是通过传入包含您的类代码的字符串来动态创建代码。我认为这比上述方法要容易一些，因为您可以使用字符串生成器构建代码并在工作室中进行测试。

这是我用来生成 dll 的代码：

print(" Microsoft.CSharp.CSharpCodeProvider objCodeProvider = new Microsoft.CSharp.CSharpCodeProvider();
        string strCode = "using System;" + Environment.NewLine + "using System.Data;" + Environment.NewLine + "using DC.Common;" + Environment.NewLine + "" + Environment.NewLine + "using System.Data.SqlClient;" + Environment.NewLine + "using System.Configuration;" + Environment.NewLine + "" + Environment.NewLine + Environment.NewLine + BaseClassFile + Environment.NewLine + BaseManagerFile + Environment.NewLine;
        string strSourceModule = BuilderSettings.ExportDir + "/" + BuilderSettings.ProjectName + "/" +  "BaseFile.cs";

        FileHelper.WriteAllText(strSourceModule, strCode);
        FileHelper.WriteAllText(BuilderSettings.ExportDir + "/" + BuilderSettings.ProjectName + "/" + "test.txt", strCode);

        ICodeCompiler icc = objCodeProvider.CreateCompiler();
        string OutputPath = BuilderSettings.ExportDir + "/" + BuilderSettings.ProjectName + "/" + BuilderSettings.ProjectName + ".dll";
        CompilerParameters parameters = new CompilerParameters();
        CompilerResults results;

        parameters.GenerateExecutable = false;
        parameters.OutputAssembly = OutputPath;
        parameters.GenerateInMemory = false;
        parameters.IncludeDebugInformation = false;

        //Add required assemblies
        DynamicLinkLibraries.Clear();

        //User defined
        DynamicLinkLibraries.Add(@"d:\wwwroot\\DC.Common\bin\Debug\DC.Common.dll");

        //System
        DynamicLinkLibraries.Add("System.dll");
        DynamicLinkLibraries.Add("System.Data.dll");
        DynamicLinkLibraries.Add("mscorlib.dll");
        DynamicLinkLibraries.Add("System.xml.dll");
        DynamicLinkLibraries.Add("System.web.dll");
        DynamicLinkLibraries.Add("System.configuration.dll");

        //Any dynamic assembly adding must be done here
        foreach (string strLibrary in DynamicLinkLibraries)
        {
            parameters.ReferencedAssemblies.Add(strLibrary);
        }

            results = icc.CompileAssemblyFromSource(parameters, strCode);

            if (results.Errors.Count > 0)
            {
                //report any compilation errors
                string strErrors = "Compilation failed:" + Environment.NewLine;

                foreach (CompilerError oError in results.Errors)
                {
                    strErrors = strErrors + "Line number " + oError.Line + ", Error Number: " + oError.ErrorNumber + ", '" + oError.ErrorText + ";";

                }

                throw new Exception("Error in CompileSourceCode(): " + Environment.NewLine + strErrors);
            }

            objCodeProvider = null;
            icc = null;
            parameters = null;");