增加一些定义

Hotfix/Outer/Demo/SubScene/C2G_CreateSubSceneRequestHandler.cs

@@ -0,0 +1,26 @@
+using Fantasy.Async;
+using Fantasy.Network;
+using Fantasy.Network.Interface;
+using Fantasy.Platform.Net;
+
+namespace Fantasy;
+
+public sealed class C2G_CreateSubSceneRequestHandler : MessageRPC<C2G_CreateSubSceneRequest, G2C_CreateSubSceneResponse>
+{
+    protected override async FTask Run(Session session, C2G_CreateSubSceneRequest request, G2C_CreateSubSceneResponse response, Action reply)
+    {
+        var scene = session.Scene;
+        var sceneConfig = SceneConfigData.Instance.GetSceneBySceneType(SceneType.Map)[0];
+        var createSubSceneResponse = (M2G_CreateSubSceneResponse)await scene.NetworkMessagingComponent.CallInnerRoute(sceneConfig.RouteId, new G2M_CreateSubSceneRequest());
+
+        if (createSubSceneResponse.ErrorCode != 0)
+        {
+            // 创建SubScene失败。
+            response.ErrorCode = createSubSceneResponse.ErrorCode;
+            return;
+        }
+        
+        // 记录下这个RouteId，以便后续的消息转发。
+        session.AddComponent<GateSubSceneFlagComponent>().SubSceneRouteId = createSubSceneResponse.SubSceneRouteId;
+    }
+}