feat: Csharp request body

src/main/resources/twilio-csharp/ResourceUsings.mustache

@@ -3,6 +3,7 @@ using System;
 using System.Collections.Generic;
 using Twilio.Base;
 using Twilio.Clients;
+using Twilio.Constant;
 using Twilio.Converters;
 using Twilio.Exceptions;
 using Twilio.Http;

src/main/resources/twilio-csharp/options/CreateOptions.mustache

@@ -19,6 +19,11 @@
         }
     {{/vendorExtensions.x-required-param-exists}}
 
+    {{^vendorExtensions.x-is-json}}
         {{>options/GetParams}}
+    {{/vendorExtensions.x-is-json}}
+    {{#vendorExtensions.x-is-json}}
+        {{>options/GetBody}}
+    {{/vendorExtensions.x-is-json}}
         {{>options/HeaderParams}}
     }

src/main/resources/twilio-csharp/options/GetBody.mustache

@@ -0,0 +1,18 @@
+
+        /// <summary> Generate the request body </summary>
+        public string GetBody()
+        {
+            string body = "";
+
+            {{#vendorExtensions.x-getparams}}
+            {{^isArray}}
+            {{^vendorExtensions.x-parameter-map}}
+            if ({{paramName}} != null)
+            {
+                body = {{apiName}}{{resourceConstant}}.ToJson({{paramName}});
+            }
+            {{/vendorExtensions.x-parameter-map}}
+            {{/isArray}}
+            {{/vendorExtensions.x-getparams}}
+            return body;
+        }

src/main/resources/twilio-csharp/options/GetParams.mustache

@@ -1,6 +1,6 @@
 
         /// <summary> Generate the necessary parameters </summary>
-        public {{#vendorExtensions.x-is-read-operation}} override{{/vendorExtensions.x-is-read-operation}} List<KeyValuePair<string, string>> GetParams()
+        public List<KeyValuePair<string, string>> GetParams()
         {
             var p = new List<KeyValuePair<string, string>>();
 

src/main/resources/twilio-csharp/resource/CreateResource.mustache

@@ -6,7 +6,11 @@
                 HttpMethod.Post,
                 Rest.Domain.{{domainPackage}},
                 path,
-                postParams: options.GetParams(),
+                {{^bodyParam}}postParams: options.GetParams(),{{/bodyParam}}
+                {{#bodyParam}}
+                contentType: EnumConstants.ContentTypeEnum.JSON,
+                body: options.GetBody(),
+                {{/bodyParam}}
                 headerParams: {{^vendorExtensions.hasOptionalHeaderParams}}null{{/vendorExtensions.hasOptionalHeaderParams}}{{#vendorExtensions.hasOptionalHeaderParams}}options.GetHeaderParams(){{/vendorExtensions.hasOptionalHeaderParams}}
             );
         }