C# CodeGenerator.New方法代码示例

 internal System.Runtime.Serialization.CreateXmlSerializableDelegate GenerateCreateXmlSerializableDelegate()
 {
     Type underlyingType = base.UnderlyingType;
     CodeGenerator generator = new CodeGenerator();
     bool allowPrivateMemberAccess = this.RequiresMemberAccessForCreate(null);
     try
     {
         generator.BeginMethod("Create" + DataContract.GetClrTypeFullName(underlyingType), typeof(System.Runtime.Serialization.CreateXmlSerializableDelegate), allowPrivateMemberAccess);
     }
     catch (SecurityException exception)
     {
         if (!allowPrivateMemberAccess || !exception.PermissionType.Equals(typeof(ReflectionPermission)))
         {
             throw;
         }
         this.RequiresMemberAccessForCreate(exception);
     }
     if (underlyingType.IsValueType)
     {
         LocalBuilder localBuilder = generator.DeclareLocal(underlyingType, underlyingType.Name + "Value");
         generator.Ldloca(localBuilder);
         generator.InitObj(underlyingType);
         generator.Ldloc(localBuilder);
     }
     else
     {
         generator.New(this.GetConstructor());
     }
     generator.ConvertValue(base.UnderlyingType, Globals.TypeOfIXmlSerializable);
     generator.Ret();
     return (System.Runtime.Serialization.CreateXmlSerializableDelegate) generator.EndMethod();
 }

 internal CreateXmlSerializableDelegate GenerateCreateXmlSerializableDelegate()
 {
     Type type = this.UnderlyingType;
     CodeGenerator ilg = new CodeGenerator();
     bool memberAccessFlag = RequiresMemberAccessForCreate(null) && !(type.FullName == "System.Xml.Linq.XElement");
     try
     {
         ilg.BeginMethod("Create" + DataContract.GetClrTypeFullName(type), typeof(CreateXmlSerializableDelegate), memberAccessFlag);
     }
     catch (SecurityException securityException)
     {
         if (memberAccessFlag)
         {
             RequiresMemberAccessForCreate(securityException);
         }
         else
         {
             throw;
         }
     }
     if (type.GetTypeInfo().IsValueType)
     {
         System.Reflection.Emit.LocalBuilder local = ilg.DeclareLocal(type, type.Name + "Value");
         ilg.Ldloca(local);
         ilg.InitObj(type);
         ilg.Ldloc(local);
     }
     else
     {
         // Special case XElement
         // codegen the same as 'internal XElement : this("default") { }'
         ConstructorInfo ctor = GetConstructor();
         if (!ctor.IsPublic && type.FullName == "System.Xml.Linq.XElement")
         {
             Type xName = type.GetTypeInfo().Assembly.GetType("System.Xml.Linq.XName");
             if (xName != null)
             {
                 MethodInfo XName_op_Implicit = xName.GetMethod(
                     "op_Implicit",
                     BindingFlags.Static | BindingFlags.NonPublic | BindingFlags.Public,
                     new Type[] { typeof(String) }
                     );
                 ConstructorInfo XElement_ctor = type.GetConstructor(
                     BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public,
                     new Type[] { xName }
                     );
                 if (XName_op_Implicit != null && XElement_ctor != null)
                 {
                     ilg.Ldstr("default");
                     ilg.Call(XName_op_Implicit);
                     ctor = XElement_ctor;
                 }
             }
         }
         ilg.New(ctor);
     }
     ilg.ConvertValue(this.UnderlyingType, Globals.TypeOfIXmlSerializable);
     ilg.Ret();
     return (CreateXmlSerializableDelegate)ilg.EndMethod();
 }

        internal void GenerateSerializerContract(string className, XmlMapping[] xmlMappings, Type[] types, string readerType, string[] readMethods, string writerType, string[] writerMethods, Dictionary<string, string> serializers)
        {
            TypeBuilder serializerContractTypeBuilder = CodeGenerator.CreateTypeBuilder(
                _moduleBuilder,
                "XmlSerializerContract",
                TypeAttributes.Public | TypeAttributes.BeforeFieldInit,
                typeof(XmlSerializerImplementation),
                Array.Empty<Type>()
                );

            ilg = new CodeGenerator(serializerContractTypeBuilder);
            PropertyBuilder propertyBuilder = serializerContractTypeBuilder.DefineProperty(
                "Reader",
                PropertyAttributes.None,
                typeof(XmlSerializationReader),
                null, null, null, null, null);
            ilg.BeginMethod(
                typeof(XmlSerializationReader),
                "get_Reader",
                Array.Empty<Type>(),
                Array.Empty<string>(),
                CodeGenerator.PublicOverrideMethodAttributes | MethodAttributes.SpecialName);
            propertyBuilder.SetGetMethod(ilg.MethodBuilder);
            ConstructorInfo ctor = CreatedTypes[readerType].GetConstructor(
                CodeGenerator.InstanceBindingFlags,
                Array.Empty<Type>()
                );
            ilg.New(ctor);
            ilg.EndMethod();

            ilg = new CodeGenerator(serializerContractTypeBuilder);
            propertyBuilder = serializerContractTypeBuilder.DefineProperty(
                "Writer",
                PropertyAttributes.None,
                typeof(XmlSerializationWriter),
                null, null, null, null, null);
            ilg.BeginMethod(
                typeof(XmlSerializationWriter),
                "get_Writer",
                Array.Empty<Type>(),
                Array.Empty<string>(),
                CodeGenerator.PublicOverrideMethodAttributes | MethodAttributes.SpecialName);
            propertyBuilder.SetGetMethod(ilg.MethodBuilder);
            ctor = CreatedTypes[writerType].GetConstructor(
                CodeGenerator.InstanceBindingFlags,
                Array.Empty<Type>()
                );
            ilg.New(ctor);
            ilg.EndMethod();

            FieldBuilder readMethodsField = GeneratePublicMethods("readMethods", "ReadMethods", readMethods, xmlMappings, serializerContractTypeBuilder);
            FieldBuilder writeMethodsField = GeneratePublicMethods("writeMethods", "WriteMethods", writerMethods, xmlMappings, serializerContractTypeBuilder);
            FieldBuilder typedSerializersField = GenerateTypedSerializers(serializers, serializerContractTypeBuilder);
            GenerateSupportedTypes(types, serializerContractTypeBuilder);
            GenerateGetSerializer(serializers, xmlMappings, serializerContractTypeBuilder);

            // Default ctor
            ConstructorInfo baseCtor = typeof(XmlSerializerImplementation).GetConstructor(
                CodeGenerator.InstanceBindingFlags,
                Array.Empty<Type>()
                );
            ilg = new CodeGenerator(serializerContractTypeBuilder);
            ilg.BeginMethod(
                typeof(void),
                ".ctor",
                Array.Empty<Type>(),
                Array.Empty<string>(),
                CodeGenerator.PublicMethodAttributes | MethodAttributes.RTSpecialName | MethodAttributes.SpecialName
                );
            ilg.Ldarg(0);
            ilg.Load(null);
            ilg.StoreMember(readMethodsField);
            ilg.Ldarg(0);
            ilg.Load(null);
            ilg.StoreMember(writeMethodsField);
            ilg.Ldarg(0);
            ilg.Load(null);
            ilg.StoreMember(typedSerializersField);
            ilg.Ldarg(0);
            ilg.Call(baseCtor);
            ilg.EndMethod();
            // Instantiate type
            Type serializerContractType = serializerContractTypeBuilder.CreateTypeInfo().AsType();
            CreatedTypes.Add(serializerContractType.Name, serializerContractType);
        }

        //GenerateGetSerializer(serializers, xmlMappings);
        private void GenerateGetSerializer(Dictionary<string, string> serializers, XmlMapping[] xmlMappings, TypeBuilder serializerContractTypeBuilder)
        {
            ilg = new CodeGenerator(serializerContractTypeBuilder);
            ilg.BeginMethod(
                typeof(XmlSerializer),
                "GetSerializer",
                new Type[] { typeof(Type) },
                new string[] { "type" },
                CodeGenerator.PublicOverrideMethodAttributes);

            for (int i = 0; i < xmlMappings.Length; i++)
            {
                if (xmlMappings[i] is XmlTypeMapping)
                {
                    Type type = xmlMappings[i].Accessor.Mapping.TypeDesc.Type;
                    if (type == null)
                        continue;
                    if (!type.GetTypeInfo().IsPublic && !type.GetTypeInfo().IsNestedPublic)
                        continue;
                    // DDB172141: Wrong generated CS for serializer of List<string> type
                    if (type.GetTypeInfo().IsGenericType || type.GetTypeInfo().ContainsGenericParameters)
                        continue;
                    ilg.Ldarg("type");
                    ilg.Ldc(type);
                    ilg.If(Cmp.EqualTo);
                    {
                        ConstructorInfo ctor = CreatedTypes[(string)serializers[xmlMappings[i].Key]].GetConstructor(
                            CodeGenerator.InstanceBindingFlags,
                            Array.Empty<Type>()
                            );
                        ilg.New(ctor);
                        ilg.Stloc(ilg.ReturnLocal);
                        ilg.Br(ilg.ReturnLabel);
                    }
                    ilg.EndIf();
                }
            }
            ilg.Load(null);
            ilg.Stloc(ilg.ReturnLocal);
            ilg.Br(ilg.ReturnLabel);
            ilg.MarkLabel(ilg.ReturnLabel);
            ilg.Ldloc(ilg.ReturnLocal);
            ilg.EndMethod();
        }

        internal string GenerateBaseSerializer(string baseSerializer, string readerClass, string writerClass, CodeIdentifiers classes)
        {
            baseSerializer = CodeIdentifier.MakeValid(baseSerializer);
            baseSerializer = classes.AddUnique(baseSerializer, baseSerializer);

            TypeBuilder baseSerializerTypeBuilder = CodeGenerator.CreateTypeBuilder(
                _moduleBuilder,
                CodeIdentifier.GetCSharpName(baseSerializer),
                TypeAttributes.Public | TypeAttributes.Abstract | TypeAttributes.BeforeFieldInit,
                typeof(XmlSerializer),
                Array.Empty<Type>());

            ConstructorInfo readerCtor = CreatedTypes[readerClass].GetConstructor(
               CodeGenerator.InstanceBindingFlags,
               Array.Empty<Type>()
               );
            ilg = new CodeGenerator(baseSerializerTypeBuilder);
            ilg.BeginMethod(typeof(XmlSerializationReader),
                "CreateReader",
                Array.Empty<Type>(),
                Array.Empty<string>(),
                CodeGenerator.ProtectedOverrideMethodAttributes);
            ilg.New(readerCtor);
            ilg.EndMethod();

            ConstructorInfo writerCtor = CreatedTypes[writerClass].GetConstructor(
               CodeGenerator.InstanceBindingFlags,
               Array.Empty<Type>()
               );
            ilg.BeginMethod(typeof(XmlSerializationWriter),
                "CreateWriter",
                Array.Empty<Type>(),
                Array.Empty<string>(),
                CodeGenerator.ProtectedOverrideMethodAttributes);
            ilg.New(writerCtor);
            ilg.EndMethod();

            baseSerializerTypeBuilder.DefineDefaultConstructor(
                MethodAttributes.Family | MethodAttributes.HideBySig | MethodAttributes.SpecialName | MethodAttributes.RTSpecialName);
            Type baseSerializerType = baseSerializerTypeBuilder.CreateTypeInfo().AsType();
            CreatedTypes.Add(baseSerializerType.Name, baseSerializerType);

            return baseSerializer;
        }

        internal FieldBuilder GenerateHashtableGetBegin(string privateName, string publicName, TypeBuilder serializerContractTypeBuilder)
        {
            FieldBuilder fieldBuilder = serializerContractTypeBuilder.DefineField(
                privateName,
                typeof(Hashtable),
                FieldAttributes.Private
                );
            ilg = new CodeGenerator(serializerContractTypeBuilder);
            PropertyBuilder propertyBuilder = serializerContractTypeBuilder.DefineProperty(
                publicName,
                PropertyAttributes.None,
                CallingConventions.HasThis,
                typeof(Hashtable),
                null, null, null, null, null);

            ilg.BeginMethod(
                typeof(Hashtable),
                "get_" + publicName,
                Array.Empty<Type>(),
                Array.Empty<string>(),
                CodeGenerator.PublicOverrideMethodAttributes | MethodAttributes.SpecialName);
            propertyBuilder.SetGetMethod(ilg.MethodBuilder);

            ilg.Ldarg(0);
            ilg.LoadMember(fieldBuilder);
            ilg.Load(null);
            // this 'if' ends in GenerateHashtableGetEnd
            ilg.If(Cmp.EqualTo);

            ConstructorInfo Hashtable_ctor = typeof(Hashtable).GetConstructor(
                CodeGenerator.InstanceBindingFlags,
                Array.Empty<Type>()
                );
            LocalBuilder _tmpLoc = ilg.DeclareLocal(typeof(Hashtable), "_tmp");
            ilg.New(Hashtable_ctor);
            ilg.Stloc(_tmpLoc);

            return fieldBuilder;
        }

            internal CreateInstanceDelegate GenerateCreateInstanceDelegate(Type type, ConstructorInfo constructor)
            {
                bool requiresMemberAccess = !IsTypeVisible(type) || ConstructorRequiresMemberAccess(constructor);

                this.ilg = new CodeGenerator();
                try
                {
                    ilg.BeginMethod("Create" + type.FullName, typeof(CreateInstanceDelegate), requiresMemberAccess);
                }
                catch (SecurityException securityException)
                {
                    if (requiresMemberAccess && securityException.PermissionType.Equals(typeof(ReflectionPermission)))
                    {
                        DiagnosticUtility.TraceHandledException(securityException, TraceEventType.Warning);
                        throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(
                            new SecurityException(SR.GetString(
                                    SR.PartialTrustServiceCtorNotVisible,
                                    type.FullName)));
                    }
                    else
                    {
                        throw;
                    }
                }

                if (type.IsValueType)
                {
                    LocalBuilder instanceLocal = ilg.DeclareLocal(type, type.Name + "Instance");
                    ilg.LoadZeroValueIntoLocal(type, instanceLocal);
                    ilg.Load(instanceLocal);
                }
                else
                {
                    ilg.New(constructor);
                }
                ilg.ConvertValue(type, ilg.CurrentMethod.ReturnType);
                return (CreateInstanceDelegate)ilg.EndMethod();
            }

 internal CreateXmlSerializableDelegate GenerateCreateXmlSerializableDelegate()
 {
     Type type = this.UnderlyingType;
     CodeGenerator ilg = new CodeGenerator();
     bool memberAccessFlag = RequiresMemberAccessForCreate(null);
     try
     {
         ilg.BeginMethod("Create" + DataContract.GetClrTypeFullName(type), typeof(CreateXmlSerializableDelegate), memberAccessFlag);
     }
     catch (SecurityException securityException)
     {
         if (memberAccessFlag && securityException.PermissionType.Equals(typeof(ReflectionPermission)))
         {
             RequiresMemberAccessForCreate(securityException);
         }
         else
         {
             throw;
         }
     }
     if (type.IsValueType)
     {
         System.Reflection.Emit.LocalBuilder local = ilg.DeclareLocal(type, type.Name + "Value");
         ilg.Ldloca(local);
         ilg.InitObj(type);
         ilg.Ldloc(local);
     }
     else
     {
         ilg.New(GetConstructor());
     }
     ilg.ConvertValue(this.UnderlyingType, Globals.TypeOfIXmlSerializable);
     ilg.Ret();
     return (CreateXmlSerializableDelegate)ilg.EndMethod();
 }

        string WriteHashtable(EnumMapping mapping, string typeName, out MethodBuilder get_TableName) {
            get_TableName = null;

            CodeIdentifier.CheckValidIdentifier(typeName);
            string propName = MakeUnique(mapping, typeName + "Values");
            if (propName == null) return CodeIdentifier.GetCSharpName(typeName);
            string memberName = MakeUnique(mapping, "_" + propName);
            propName = CodeIdentifier.GetCSharpName(propName);

            FieldBuilder fieldBuilder = this.typeBuilder.DefineField(
                memberName,
                typeof(Hashtable),
                FieldAttributes.Private
                );

            PropertyBuilder propertyBuilder = this.typeBuilder.DefineProperty(
                propName,
                PropertyAttributes.None,
                CallingConventions.HasThis,
                typeof(Hashtable),
                null, null, null, null, null);

            ilg = new CodeGenerator(this.typeBuilder);
            ilg.BeginMethod(
                typeof(Hashtable),
                "get_" + propName,
                CodeGenerator.EmptyTypeArray,
                CodeGenerator.EmptyStringArray,
                MethodAttributes.Assembly | MethodAttributes.HideBySig | MethodAttributes.SpecialName);

            ilg.Ldarg(0);
            ilg.LoadMember(fieldBuilder);
            ilg.Load(null);
            ilg.If(Cmp.EqualTo);

            ConstructorInfo Hashtable_ctor = typeof(Hashtable).GetConstructor(
                CodeGenerator.InstanceBindingFlags,
                null,
                CodeGenerator.EmptyTypeArray,
                null
                );
            LocalBuilder hLoc = ilg.DeclareLocal(typeof(Hashtable), "h");
            ilg.New(Hashtable_ctor);
            ilg.Stloc(hLoc);

            ConstantMapping[] constants = mapping.Constants;
            MethodInfo Hashtable_Add = typeof(Hashtable).GetMethod(
                "Add",
                CodeGenerator.InstanceBindingFlags,
                null,
                new Type[] { typeof(Object), typeof(Object) },
                null
                );

            for (int i = 0; i < constants.Length; i++) {
                ilg.Ldloc(hLoc);
                ilg.Ldstr(constants[i].XmlName);
                ilg.Ldc(Enum.ToObject(mapping.TypeDesc.Type, constants[i].Value));
                ilg.ConvertValue(mapping.TypeDesc.Type, typeof(long));
                ilg.ConvertValue(typeof(long), typeof(Object));

                ilg.Call(Hashtable_Add);
            }

            ilg.Ldarg(0);
            ilg.Ldloc(hLoc);
            ilg.StoreMember(fieldBuilder);

            ilg.EndIf();

            ilg.Ldarg(0);
            ilg.LoadMember(fieldBuilder);

            get_TableName = ilg.EndMethod();
            propertyBuilder.SetGetMethod(get_TableName);

            return propName;
        }

//.........这里部分代码省略.........
            ilg.Ldloc(typeof(XmlQualifiedName), "xsiType");
            ilg.Load(null);
            ilg.Ceq();
            if (!structMapping.TypeDesc.IsRoot) {
                labelTrue = ilg.DefineLabel();
                labelEnd = ilg.DefineLabel();
                // xsiType == null
                ilg.Brtrue(labelTrue);
                WriteQNameEqual("xsiType", structMapping.TypeName, structMapping.Namespace);
                // Bool result for WriteQNameEqual is on the stack
                ilg.Br_S(labelEnd);
                ilg.MarkLabel(labelTrue);
                ilg.Ldc(true);
                ilg.MarkLabel(labelEnd);
            }
            ilg.If(); // if (xsiType == null
            if (structMapping.TypeDesc.IsRoot) {
                ConstructorInfo XmlQualifiedName_ctor = typeof(XmlQualifiedName).GetConstructor(
                    CodeGenerator.InstanceBindingFlags,
                    null,
                    new Type[] { typeof(String), typeof(String) },
                    null
                    );
                MethodInfo XmlSerializationReader_ReadTypedPrimitive = typeof(XmlSerializationReader).GetMethod(
                    "ReadTypedPrimitive",
                    CodeGenerator.InstanceBindingFlags,
                    null,
                    new Type[] { typeof(XmlQualifiedName) },
                    null
                    );
                ilg.Ldarg(0);
                ilg.Ldstr(Soap.UrType);
                ilg.Ldstr(XmlSchema.Namespace);
                ilg.New(XmlQualifiedName_ctor);
                ilg.Call(XmlSerializationReader_ReadTypedPrimitive);
                ilg.Stloc(ilg.ReturnLocal);
                ilg.Br(ilg.ReturnLabel);
            }
            WriteDerivedTypes(structMapping, !structMapping.TypeDesc.IsRoot, typeName);
            if (structMapping.TypeDesc.IsRoot) WriteEnumAndArrayTypes();
            ilg.Else(); // if (xsiType == null
            if (structMapping.TypeDesc.IsRoot) {
                MethodInfo XmlSerializationReader_ReadTypedPrimitive = typeof(XmlSerializationReader).GetMethod(
                    "ReadTypedPrimitive",
                    CodeGenerator.InstanceBindingFlags,
                    null,
                    new Type[] { locXsiType.LocalType },
                    null
                    );
                ilg.Ldarg(0);
                ilg.Ldloc(locXsiType);
                ilg.Call(XmlSerializationReader_ReadTypedPrimitive);
                ilg.Stloc(ilg.ReturnLocal);
                ilg.Br(ilg.ReturnLabel);
            }
            else {
                MethodInfo XmlSerializationReader_CreateUnknownTypeException = typeof(XmlSerializationReader).GetMethod(
                     "CreateUnknownTypeException",
                     CodeGenerator.InstanceBindingFlags,
                     null,
                     new Type[] { typeof(XmlQualifiedName) },
                     null
                     );
                ilg.Ldarg(0);
                ilg.Ldloc(locXsiType);
                ilg.Call(XmlSerializationReader_CreateUnknownTypeException);

        internal void ILGenForCreateInstance(CodeGenerator ilg, Type type, Type cast, bool nonPublic)
        {
            // Special case DBNull
            if (type == Globals.TypeOfDBNull)
            {
                FieldInfo DBNull_Value = Globals.TypeOfDBNull.GetField("Value", CodeGenerator.StaticBindingFlags);
                ilg.LoadMember(DBNull_Value);
                return;
            }

            // Special case XElement
            // codegen the same as 'internal XElement : this("default") { }'
            if (type.FullName == "System.Xml.Linq.XElement")
            {
                Type xName = type.GetTypeInfo().Assembly.GetType("System.Xml.Linq.XName");
                if (xName != null)
                {
                    MethodInfo XName_op_Implicit = xName.GetMethod(
                        "op_Implicit",
                        CodeGenerator.StaticBindingFlags,
                        new Type[] { typeof(String) }
                        );
                    ConstructorInfo XElement_ctor = type.GetConstructor(
                        CodeGenerator.InstanceBindingFlags,
                        new Type[] { xName }
                        );
                    if (XName_op_Implicit != null && XElement_ctor != null)
                    {
                        ilg.Ldstr("default");
                        ilg.Call(XName_op_Implicit);
                        ilg.New(XElement_ctor);
                        return;
                    }
                }
            }

            Label labelReturn = ilg.DefineLabel();
            Label labelEndIf = ilg.DefineLabel();

            // TypeInfo typeInfo = type.GetTypeInfo();
            // typeInfo not declared explicitly
            ilg.Ldc(type);
            MethodInfo getTypeInfoMehod = typeof(IntrospectionExtensions).GetMethod(
                  "GetTypeInfo",
                  CodeGenerator.StaticBindingFlags,
                  new[] { typeof(Type) }
                  );
            ilg.Call(getTypeInfoMehod);

            // IEnumerator<ConstructorInfo> e = typeInfo.DeclaredConstructors.GetEnumerator();
            LocalBuilder enumerator = ilg.DeclareLocal(typeof(IEnumerator<>).MakeGenericType(typeof(ConstructorInfo)), "e");
            MethodInfo getDeclaredConstructors = typeof(TypeInfo).GetMethod("get_DeclaredConstructors");
            MethodInfo getEnumerator = typeof(IEnumerable<>).MakeGenericType(typeof(ConstructorInfo)).GetMethod("GetEnumerator");
            ilg.Call(getDeclaredConstructors);
            ilg.Call(getEnumerator);
            ilg.Stloc(enumerator);

            ilg.WhileBegin();
            // ConstructorInfo constructorInfo = e.Current();
            MethodInfo enumeratorCurrent = typeof(IEnumerator).GetMethod("get_Current");
            ilg.Ldloc(enumerator);
            ilg.Call(enumeratorCurrent);
            LocalBuilder constructorInfo = ilg.DeclareLocal(typeof(ConstructorInfo), "constructorInfo");
            ilg.Stloc(constructorInfo);

            // if (!constructorInfo.IsStatic && constructorInfo.GetParameters.Length() == 0)
            ilg.Ldloc(constructorInfo);
            MethodInfo constructorIsStatic = typeof(ConstructorInfo).GetMethod("get_IsStatic");
            ilg.Call(constructorIsStatic);
            ilg.Brtrue(labelEndIf);
            ilg.Ldloc(constructorInfo);
            MethodInfo constructorGetParameters = typeof(ConstructorInfo).GetMethod("GetParameters");
            ilg.Call(constructorGetParameters);
            ilg.Ldlen();
            ilg.Ldc(0);
            ilg.Cne();
            ilg.Brtrue(labelEndIf);

            // constructorInfo.Invoke(null);
            MethodInfo constructorInvoke = typeof(ConstructorInfo).GetMethod("Invoke", new Type[] { typeof(object[]) });
            ilg.Ldloc(constructorInfo);
            ilg.Load(null);
            ilg.Call(constructorInvoke);
            ilg.Br(labelReturn);

            ilg.MarkLabel(labelEndIf);
            ilg.WhileBeginCondition(); // while (e.MoveNext())
            MethodInfo IEnumeratorMoveNext = typeof(IEnumerator).GetMethod(
                "MoveNext",
                CodeGenerator.InstanceBindingFlags,
                Array.Empty<Type>());
            ilg.Ldloc(enumerator);
            ilg.Call(IEnumeratorMoveNext);
            ilg.WhileEndCondition();
            ilg.WhileEnd();

            MethodInfo Activator_CreateInstance = typeof(Activator).GetMethod(
                  "CreateInstance",
                  CodeGenerator.StaticBindingFlags,
                  new Type[] { typeof(Type) }
//.........这里部分代码省略.........

        internal void ILGenForCreateInstance(CodeGenerator ilg, Type type, Type cast, bool nonPublic) {
            // Special case DBNull
            if (type == typeof(DBNull)) {
                FieldInfo DBNull_Value = typeof(DBNull).GetField("Value", CodeGenerator.StaticBindingFlags);
                ilg.LoadMember(DBNull_Value);
                return;
            }

            // Special case XElement
            // codegen the same as 'internal XElement : this("default") { }'
            if (type.FullName == "System.Xml.Linq.XElement") {
                Type xName = type.Assembly.GetType("System.Xml.Linq.XName");
                if (xName != null) {
                    MethodInfo XName_op_Implicit = xName.GetMethod(
                        "op_Implicit",
                        CodeGenerator.StaticBindingFlags,
                        null,
                        new Type[] { typeof(String) },
                        null
                        );
                    ConstructorInfo XElement_ctor = type.GetConstructor(
                        CodeGenerator.InstanceBindingFlags,
                        null,
                        new Type[] { xName },
                        null
                        );
                    if (XName_op_Implicit != null && XElement_ctor != null) {
                        ilg.Ldstr("default");
                        ilg.Call(XName_op_Implicit);
                        ilg.New(XElement_ctor);
                        return;
                    }
                }
            }

            BindingFlags bindingFlags = BindingFlags.Instance | BindingFlags.Public | BindingFlags.CreateInstance;
            if (nonPublic) {
                bindingFlags |= BindingFlags.NonPublic;
            }

            MethodInfo Activator_CreateInstance = typeof(Activator).GetMethod(
                  "CreateInstance",
                  CodeGenerator.StaticBindingFlags,
                  null,
                  new Type[] { typeof(Type), typeof(BindingFlags), typeof(Binder), typeof(Object[]), typeof(CultureInfo) },
                  null
                  );
            ilg.Ldc(type);
            ilg.Load((int)bindingFlags);
            ilg.Load(null);
            ilg.NewArray(typeof(Object), 0);
            ilg.Load(null);
            ilg.Call(Activator_CreateInstance);
            if (cast != null)
                ilg.ConvertValue(Activator_CreateInstance.ReturnType, cast);
        }

        internal void ILGenForCreateInstance(CodeGenerator ilg, Type type, Type cast, bool nonPublic)
        {
            // Special case DBNull
            if (type == Globals.TypeOfDBNull)
            {
                FieldInfo DBNull_Value = Globals.TypeOfDBNull.GetField("Value", CodeGenerator.StaticBindingFlags);
                ilg.LoadMember(DBNull_Value);
                return;
            }

            // Special case XElement
            // codegen the same as 'internal XElement : this("default") { }'
            if (type.FullName == "System.Xml.Linq.XElement")
            {
                Type xName = type.GetTypeInfo().Assembly.GetType("System.Xml.Linq.XName");
                if (xName != null)
                {
                    MethodInfo XName_op_Implicit = xName.GetMethod(
                        "op_Implicit",
                        CodeGenerator.StaticBindingFlags,
                        new Type[] { typeof(String) }
                        );
                    ConstructorInfo XElement_ctor = type.GetConstructor(
                        CodeGenerator.InstanceBindingFlags,
                        new Type[] { xName }
                        );
                    if (XName_op_Implicit != null && XElement_ctor != null)
                    {
                        ilg.Ldstr("default");
                        ilg.Call(XName_op_Implicit);
                        ilg.New(XElement_ctor);
                        return;
                    }
                }
            }

            MethodInfo Activator_CreateInstance = typeof(Activator).GetMethod(
                  "CreateInstance",
                  CodeGenerator.StaticBindingFlags,
                  new Type[] { typeof(Type) }
                  );
            ilg.Ldc(type);
            ilg.Call(Activator_CreateInstance);
            if (cast != null)
                ilg.ConvertValue(Activator_CreateInstance.ReturnType, cast);
        }