修复Enum类型fromJson的编码错误。

ModeType.cs

@@ -358,7 +358,7 @@ namespace FlutterCodeGenerator
                         else if (listModelType.GenericArgumentModelType is EnumModeType)
                         {
                             var model = listModelType.GenericArgumentModelType.GetFlutterTypeName();
-                            source.AppendLine($"\t\t\t{child.Name_Lower}: map['{child.Name_Upper}'] != null ? (map['{child.Name_Upper}'] as List).map((e)=>{model}.values.firstWhere((i) => i.index == map[e])).toList() : null,");
+                            source.AppendLine($"\t\t\t{child.Name_Lower}: map['{child.Name_Upper}'] != null ? (map['{child.Name_Upper}'] as List).map((e)=>{model}.values.firstWhere((i) => i.index == e)).toList() : null,");
                         }
                         else
                         {
@@ -380,7 +380,7 @@ namespace FlutterCodeGenerator
                         else if (listModelType.GenericArgumentModelType is EnumModeType)
                         {
                             var model = listModelType.GenericArgumentModelType.GetFlutterTypeName();
-                            source.AppendLine($"\t\t\t{child.Name_Lower}: map['{child.Name_Upper}'] != null ? (map['{child.Name_Upper}'] as List).map((e)=>{model}.values.firstWhere((i) => i.index == map[e])).toList() : null,");
+                            source.AppendLine($"\t\t\t{child.Name_Lower}: map['{child.Name_Upper}'] != null ? (map['{child.Name_Upper}'] as List).map((e)=>{model}.values.firstWhere((i) => i.index == e)).toList() : null,");
                         }
                         else
                         {
@@ -398,7 +398,7 @@ namespace FlutterCodeGenerator
                         else if (listModelType.GenericArgumentModelType is EnumModeType)
                         {
                             var model = listModelType.GenericArgumentModelType.GetFlutterTypeName();
-                            source.AppendLine($"\t\t\t{child.Name_Lower}: map['{child.Name_Upper}'] != null ? (map['{child.Name_Upper}'] as List).map((e)=>{model}.values.firstWhere((i) => i.index == map[e])).toList() : null,");
+                            source.AppendLine($"\t\t\t{child.Name_Lower}: map['{child.Name_Upper}'] != null ? (map['{child.Name_Upper}'] as List).map((e)=>{model}.values.firstWhere((i) => i.index == e)).toList() : null,");
                         }
                         else
                         {
@@ -429,7 +429,7 @@ namespace FlutterCodeGenerator
                         else if (userDefinedGenericModelType.GenericArgumentModelType is EnumModeType)
                         {
                             var model = userDefinedGenericModelType.GenericArgumentModelType.GetFlutterTypeName();
-                            source.AppendLine($"\t\t\t{child.Name_Lower}: map['{child.Name_Upper}'] != null ? (map['{child.Name_Upper}'] as List).map((e)=>{model}.values.firstWhere((i) => i.index == map[e])).toList() : null,");
+                            source.AppendLine($"\t\t\t{child.Name_Lower}: map['{child.Name_Upper}'] != null ? (map['{child.Name_Upper}'] as List).map((e)=>{model}.values.firstWhere((i) => i.index == e)).toList() : null,");
                         }
                         else
                         {
@@ -447,7 +447,7 @@ namespace FlutterCodeGenerator
                         else if (userDefinedGenericModelType.GenericArgumentModelType is EnumModeType)
                         {
                             var model = userDefinedGenericModelType.GenericArgumentModelType.GetFlutterTypeName();
-                            source.AppendLine($"\t\t\t{child.Name_Lower}: map['{child.Name_Upper}'] != null ? (map['{child.Name_Upper}'] as List).map((e)=>{model}.values.firstWhere((i) => i.index == map[e])).toList() : null,");
+                            source.AppendLine($"\t\t\t{child.Name_Lower}: map['{child.Name_Upper}'] != null ? (map['{child.Name_Upper}'] as List).map((e)=>{model}.values.firstWhere((i) => i.index == e)).toList() : null,");
                         }
                         else
                         {