C# Class.Define方法代碼示例

		CompiledMethod CompileBlock (Class host, Undo undo, Report Report)
		{
#if STATIC
			throw new NotSupportedException ();
#else
			string current_debug_name = "eval-" + count + ".dll";
			++count;

			AssemblyDefinitionDynamic assembly;
			AssemblyBuilderAccess access;

			if (Environment.GetEnvironmentVariable ("SAVE") != null) {
				access = AssemblyBuilderAccess.RunAndSave;
				assembly = new AssemblyDefinitionDynamic (module, current_debug_name, current_debug_name);
				assembly.Importer = importer;
			} else {
#if NET_4_0
				access = AssemblyBuilderAccess.RunAndCollect;
#else
				access = AssemblyBuilderAccess.Run;
#endif
				assembly = new AssemblyDefinitionDynamic (module, current_debug_name);
			}

			assembly.Create (AppDomain.CurrentDomain, access);

			Method expression_method;
			if (host != null) {
				var base_class_imported = importer.ImportType (base_class);
				var baseclass_list = new List<FullNamedExpression> (1) {
					new TypeExpression (base_class_imported, host.Location)
				};

				host.SetBaseTypes (baseclass_list);

				expression_method = (Method) host.Members[0];

				if ((expression_method.ModFlags & Modifiers.ASYNC) != 0) {
					//
					// Host method is async. When WaitOnTask is set we wrap it with wait
					//
					// void AsyncWait (ref object $retval) {
					//	$retval = Host();
					//	((Task)$retval).Wait();  // When WaitOnTask is set
					// }
					//
					var p = new ParametersCompiled (
						new Parameter (new TypeExpression (module.Compiler.BuiltinTypes.Object, Location.Null), "$retval", Parameter.Modifier.REF, null, Location.Null)
					);

					var method = new Method(host, new TypeExpression(module.Compiler.BuiltinTypes.Void, Location.Null),
						Modifiers.PUBLIC | Modifiers.STATIC, new MemberName("AsyncWait"), p, null);

					method.Block = new ToplevelBlock(method.Compiler, p, Location.Null);
					method.Block.AddStatement(new StatementExpression (new SimpleAssign(
						new SimpleName(p [0].Name, Location.Null),
						new Invocation(new SimpleName(expression_method.MemberName.Name, Location.Null), new Arguments(0)),
						Location.Null), Location.Null));

					if (WaitOnTask) {
						var task = new Cast (expression_method.TypeExpression, new SimpleName (p [0].Name, Location.Null), Location.Null);

						method.Block.AddStatement (new StatementExpression (new Invocation (
								new MemberAccess (task, "Wait", Location.Null),
							new Arguments (0)), Location.Null));
					}

					host.AddMember(method);

					expression_method = method;
				}

				host.CreateContainer();
				host.DefineContainer();
				host.Define();

			} else {
				expression_method = null;
			}

			module.CreateContainer ();

			// Disable module and source file re-definition checks
			module.EnableRedefinition ();
			source_file.EnableRedefinition ();

			module.Define ();

			if (Report.Errors != 0){
				if (undo != null)
					undo.ExecuteUndo ();

				return null;
			}

			if (host != null){
				host.PrepareEmit ();
				host.EmitContainer ();
			}
			
//.........這裏部分代碼省略.........

		CompiledMethod CompileBlock (Class host, Undo undo, Report Report)
		{
#if STATIC
			throw new NotSupportedException ();
#else
			string current_debug_name = "eval-" + count + ".dll";
			++count;

			AssemblyDefinitionDynamic assembly;
			AssemblyBuilderAccess access;

			if (Environment.GetEnvironmentVariable ("SAVE") != null) {
				access = AssemblyBuilderAccess.RunAndSave;
				assembly = new AssemblyDefinitionDynamic (module, current_debug_name, current_debug_name);
				assembly.Importer = importer;
			} else {
#if NET_4_0
				access = AssemblyBuilderAccess.RunAndCollect;
#else
				access = AssemblyBuilderAccess.Run;
#endif
				assembly = new AssemblyDefinitionDynamic (module, current_debug_name);
			}

			assembly.Create (AppDomain.CurrentDomain, access);

			Method expression_method;
			if (host != null) {
				var base_class_imported = importer.ImportType (base_class);
				var baseclass_list = new List<FullNamedExpression> (1) {
					new TypeExpression (base_class_imported, host.Location)
				};

				host.AddBasesForPart (baseclass_list);

				host.CreateContainer ();
				host.DefineContainer ();
				host.Define ();

				expression_method = (Method) host.Members[0];
			} else {
				expression_method = null;
			}

			module.CreateContainer ();
			source_file.EnableUsingClausesRedefinition ();
			module.Define ();

			if (Report.Errors != 0){
				if (undo != null)
					undo.ExecuteUndo ();

				return null;
			}

			if (host != null){
				host.EmitContainer ();
			}
			
			module.EmitContainer ();
			if (Report.Errors != 0){
				if (undo != null)
					undo.ExecuteUndo ();
				return null;
			}

			module.CloseContainer ();
			if (host != null)
				host.CloseContainer ();

			if (access == AssemblyBuilderAccess.RunAndSave)
				assembly.Save ();

			if (host == null)
				return null;
			
			//
			// Unlike Mono, .NET requires that the MethodInfo is fetched, it cant
			// work from MethodBuilders.   Retarded, I know.
			//
			var tt = assembly.Builder.GetType (host.TypeBuilder.Name);
			var mi = tt.GetMethod (expression_method.MemberName.Name);

			//
			// We need to then go from FieldBuilder to FieldInfo
			// or reflection gets confused (it basically gets confused, and variables override each
			// other).
			//
			foreach (var member in host.Members) {
				var field = member as Field;
				if (field == null)
					continue;

				var fi = tt.GetField (field.Name);

				Tuple<FieldSpec, FieldInfo> old;

				// If a previous value was set, nullify it, so that we do
				// not leak memory
				if (fields.TryGetValue (field.Name, out old)) {
//.........這裏部分代碼省略.........

		static CompiledMethod CompileBlock (Class host, Undo undo, Report Report)
		{
			AssemblyDefinitionDynamic assembly;
			AssemblyBuilderAccess access;

			if (Environment.GetEnvironmentVariable ("SAVE") != null) {
				access = AssemblyBuilderAccess.RunAndSave;
				assembly = new AssemblyDefinitionDynamic (RootContext.ToplevelTypes, current_debug_name, current_debug_name);
				assembly.Importer = loader.Importer;
			} else {
#if NET_4_0
				access = AssemblyBuilderAccess.RunAndCollect;
#else
				access = AssemblyBuilderAccess.Run;
#endif
				assembly = new AssemblyDefinitionDynamic (RootContext.ToplevelTypes, current_debug_name);
			}

			assembly.Create (AppDomain.CurrentDomain, access);

			if (host != null) {
				host.CreateType ();
				host.Define ();
			}

			RootContext.ToplevelTypes.CreateType ();
			RootContext.ToplevelTypes.Define ();

			if (Report.Errors != 0){
				undo.ExecuteUndo ();
				return null;
			}

			TypeBuilder tb = null;
			MethodBuilder mb = null;
				
			if (host != null){
				tb = host.TypeBuilder;
				mb = null;
				foreach (MemberCore member in host.Methods){
					if (member.Name != "Host")
						continue;
					
					MethodOrOperator method = (MethodOrOperator) member;
					mb = method.MethodBuilder;
					break;
				}

				if (mb == null)
					throw new Exception ("Internal error: did not find the method builder for the generated method");

				host.EmitType ();
			}
			
			RootContext.ToplevelTypes.Emit ();
			if (Report.Errors != 0){
				undo.ExecuteUndo ();
				return null;
			}

			RootContext.ToplevelTypes.CloseType ();
			if (host != null)
				host.CloseType ();

			if (access == AssemblyBuilderAccess.RunAndSave)
				assembly.Save ();

			if (host == null)
				return null;
			
			//
			// Unlike Mono, .NET requires that the MethodInfo is fetched, it cant
			// work from MethodBuilders.   Retarded, I know.
			//
			var tt = assembly.Builder.GetType (tb.Name);
			MethodInfo mi = tt.GetMethod (mb.Name);
			
			// Pull the FieldInfos from the type, and keep track of them
			foreach (Field field in queued_fields){
				FieldInfo fi = tt.GetField (field.Name);

				Tuple<FieldSpec, FieldInfo> old;
				
				// If a previous value was set, nullify it, so that we do
				// not leak memory
				if (fields.TryGetValue (field.Name, out old)) {
					if (old.Item1.MemberType.IsStruct) {
						//
						// TODO: Clear fields for structs
						//
					} else {
						try {
							old.Item2.SetValue (null, null);
						} catch {
						}
					}

					fields [field.Name] = Tuple.Create (field.Spec, fi);
				} else {
					fields.Add (field.Name, Tuple.Create (field.Spec, fi));
//.........這裏部分代碼省略.........