86 lines
2.5 KiB
Markdown
86 lines
2.5 KiB
Markdown
---
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id: c70709d1-d0a6-4dec-9ce5-de04540e5de6
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title: AssemblyGenerator
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uti: com.xamarin.workbook
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platforms:
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- Console
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---
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From [this article](https://msdn.microsoft.com/en-us/library/system.runtime.compilerservices.isudtreturn\(v=vs.110\).aspx?cs-save-lang=1&cs-lang=csharp#code-snippet-1)
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```csharp
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using System.Reflection;
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using System.Reflection.Emit;
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using System.Runtime.CompilerServices;
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using System.Threading;
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```
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```csharp
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class CodeEmitter {
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AssemblyBuilder asmBuilder;
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string asmName;
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ModuleBuilder modBuilder;
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public CodeEmitter(string name) {
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asmName = name;
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AssemblyName aname = new AssemblyName { Name = name };
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AppDomain currentDomain = Thread.GetDomain();
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asmBuilder = currentDomain.DefineDynamicAssembly(aname, AssemblyBuilderAccess.RunAndSave);
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modBuilder = asmBuilder.DefineDynamicModule(asmName);
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}
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public TypeBuilder CreateType(string name) {
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return modBuilder.DefineType(name, TypeAttributes.Public);
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}
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public void WriteAssembly(MethodBuilder entryPoint) {
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asmBuilder.SetEntryPoint(entryPoint);
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asmBuilder.Save(asmName);
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}
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}
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```
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```csharp
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void main() {
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CodeEmitter e = new CodeEmitter("test-mod.exe");
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TypeBuilder mainClass = e.CreateType("MainClass");
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// main method
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MethodBuilder mBuilder = mainClass.DefineMethod("mainMethod", MethodAttributes.Static);
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ILGenerator ilGen = mBuilder.GetILGenerator();
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ilGen.Emit(OpCodes.Ldstr, "Hello World");
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Type[] type = new [] {typeof(string)};
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MethodInfo writeMI = typeof(Console).GetMethod("WriteLine", type);
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ilGen.EmitCall(OpCodes.Call, writeMI, null);
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ilGen.Emit(OpCodes.Ret);
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Type[] fType = new [] { typeof(IsUdtReturn)};
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// operator overload
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MethodBuilder sBuilder = mainClass.DefineMethod(
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"op_Decrement",
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MethodAttributes.Static | MethodAttributes.SpecialName | MethodAttributes.Public,
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CallingConventions.Any,
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Type.GetType("System.Void"),
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fType, // rtype required mods
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null, // rtype optional mods
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null, // parameters
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null, // parameter modreq
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null); // parameters modopt
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var silGen = sBuilder.GetILGenerator();
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silGen.Emit(OpCodes.Ret);
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// field
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//Type[] fType = new [] { typeof(IsUdtReturn)};
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mainClass.DefineField("modifiedInteger", Type.GetType("System.Type"), fType, null, FieldAttributes.Public);
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// write
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mainClass.CreateType();
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e.WriteAssembly(mBuilder);
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Console.WriteLine("Assembly created");
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}
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```
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```csharp
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main();
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``` |