modify OpenApiRequestBody to implement IOpenApiSerializable

Author: xuzhg

src/Microsoft.OpenApi/Models/OpenApiComponents.cs

@@ -90,7 +90,7 @@ public void SerializeAsV3(IOpenApiWriter writer)
             writer.WriteOptionalMap(OpenApiConstants.Examples, Examples, (w, e) => e.SerializeAsV3(w));
 
             // requestBodies
-            writer.WriteOptionalMap(OpenApiConstants.RequestBodies, RequestBodies, (w, r) => r.WriteAsV3(w));
+            writer.WriteOptionalMap(OpenApiConstants.RequestBodies, RequestBodies, (w, r) => r.SerializeAsV3(w));
 
             // headers
             writer.WriteOptionalMap(OpenApiConstants.Headers, Headers, (w, h) => h.SerializeAsV3(w));

src/Microsoft.OpenApi/Models/OpenApiOperation.cs

@@ -144,7 +144,7 @@ public void SerializeAsV3(IOpenApiWriter writer)
             writer.WriteOptionalCollection(OpenApiConstants.Parameters, Parameters, (w, p) => p.SerializeAsV3(w));
 
             // requestBody
-            writer.WriteOptionalObject(OpenApiConstants.RequestBody, RequestBody, (w, r) => r.WriteAsV3(w));
+            writer.WriteOptionalObject(OpenApiConstants.RequestBody, RequestBody, (w, r) => r.SerializeAsV3(w));
 
             // responses
             writer.WriteRequiredObject(OpenApiConstants.Responses, Responses, (w, r) => r.SerializeAsV3(w));

src/Microsoft.OpenApi/Models/OpenApiRequestBody.cs

@@ -4,7 +4,6 @@
 // ------------------------------------------------------------
 
 using System.Collections.Generic;
-using System.Linq;
 using Microsoft.OpenApi.Any;
 using Microsoft.OpenApi.Interfaces;
 using Microsoft.OpenApi.Writers;
@@ -14,7 +13,7 @@ namespace Microsoft.OpenApi.Models
     /// <summary>
     /// Request Body Object
     /// </summary>
-    public class OpenApiRequestBody : IOpenApiReferenceable, IOpenApiExtensible
+    public class OpenApiRequestBody : IOpenApiSerializable, IOpenApiReferenceable, IOpenApiExtensible
     {
         /// <summary>
         /// Reference object.
@@ -46,7 +45,7 @@ public class OpenApiRequestBody : IOpenApiReferenceable, IOpenApiExtensible
         /// <summary>
         /// Serialize <see cref="OpenApiRequestBody"/> to Open Api v3.0
         /// </summary>
-        public void WriteAsV3(IOpenApiWriter writer)
+        public void SerializeAsV3(IOpenApiWriter writer)
         {
             if (writer == null)
             {
@@ -80,7 +79,7 @@ public void WriteAsV3(IOpenApiWriter writer)
         /// <summary>
         /// Serialize <see cref="OpenApiRequestBody"/> to Open Api v2.0
         /// </summary>
-        public void WriteAsV2(IOpenApiWriter writer)
+        public void SerializeAsV2(IOpenApiWriter writer)
         {
             // RequestBody object does not exist in V2.
         }