More examples with CollectionJson

gistfile1.cs

+using System;
+using System.Collections.Generic;
+using System.Web.Http;
+using WebApiContrib.CollectionJson;
+using WebApiContrib.Formatting.CollectionJson;
+using WebApiContrib.Formatting.CollectionJson.Infrastructure;
+using WebApiContrib.Formatting.CollectionJson.Models;
+
+namespace CollectionJson.Controllers
+{
+    // This example introduces a slightly enhanced formatter that looks for a interface on the return object
+    // to know if it can be serialized as Collection+json
+    // This requires an extra interface and formatter.
+
+    public class Friends3Controller : ApiController
+    {
+        private readonly IFriendRepository _friendRepository;
+
+        public Friends3Controller(IFriendRepository friendRepository)
+        {
+            _friendRepository = friendRepository;
+        }
+
+        public FriendsViewModel Get(int id)
+        {
+            var viewModel = new FriendsViewModel();
+            viewModel.Friend = _friendRepository.Get(id);
+            return viewModel;
+        }
+    }
+
+    public class FriendsViewModel : ICollectionJsonWriter
+    {
+
+        public Friend Friend { get; set; }
+
+        public ReadDocument Write()
+        {
+            var writer = new FriendDocumentWriter();
+            var readDocument = writer.Write(new List<Friend>() { Friend });
+            return readDocument;
+        }
+    }
+
+
+    public interface ICollectionJsonWriter
+    {
+        ReadDocument Write();
+    }
+
+   
+    public class NegotiatingCollectionJsonFormatter : CollectionJsonFormatter
+    {
+
+        public override bool CanWriteType(Type type)
+        {
+            return base.CanWriteType(type) || typeof(ICollectionJsonWriter).IsAssignableFrom(type);
+        }
+        public override System.Threading.Tasks.Task WriteToStreamAsync(Type type, object value, System.IO.Stream writeStream, System.Net.Http.HttpContent content, System.Net.TransportContext transportContext)
+        {
+            if (typeof(ICollectionJsonWriter).IsAssignableFrom(type))
+            {
+                var writer = (ICollectionJsonWriter)value;
+                var readDocument = writer.Write();
+                return base.WriteToStreamAsync(typeof(ReadDocument), readDocument, writeStream, content, transportContext);
+            }
+            else
+            {
+                return base.WriteToStreamAsync(type, value, writeStream, content, transportContext);
+            }
+        }
+    }
+
+}