Newtonsoft config methods

src/Flurl.Http.Newtonsoft/ExtensionMethods.cs

@@ -2,6 +2,8 @@
 using System.Collections.Generic;
 using System.Dynamic;
 using System.Threading.Tasks;
+using Flurl.Http.Configuration;
+using Newtonsoft.Json;
 
 namespace Flurl.Http.Newtonsoft
 {
@@ -47,5 +49,23 @@ public static async Task<IList<dynamic>> ReceiveJsonList(this Task<IFlurlRespons
 			if (resp == null) return null;
 			return await resp.GetJsonListAsync().ConfigureAwait(false);
 		}
+
+		/// <summary>
+		/// Shortcut to use NewtonsoftJsonSerializer with this IFlurlClientBuilder.
+		/// </summary>
+		/// <param name="builder">This IFlurlClientBuilder.</param>
+		/// <param name="settings">Optional custom JsonSerializerSettings.</param>
+		/// <returns></returns>
+		public static IFlurlClientBuilder UseNewtonsoft(this IFlurlClientBuilder builder, JsonSerializerSettings settings = null) =>
+			builder.WithSettings(fs => fs.JsonSerializer = new NewtonsoftJsonSerializer(settings));
+
+		/// <summary>
+		/// Shortcut to use NewtonsoftJsonSerializer with all FlurlClients registered in this cache.
+		/// </summary>
+		/// <param name="cache">This IFlurlClientCache.</param>
+		/// <param name="settings">Optional custom JsonSerializerSettings.</param>
+		/// <returns></returns>
+		public static IFlurlClientCache UseNewtonsoft(this IFlurlClientCache cache, JsonSerializerSettings settings = null) =>
+			cache.WithDefaults(builder => builder.UseNewtonsoft(settings));
 	}
 }

test/Flurl.Test/Http/NewtonsoftTests.cs

@@ -1,8 +1,11 @@
-using NUnit.Framework;
+using System;
+using NUnit.Framework;
 using Flurl.Http;
 using Flurl.Http.Newtonsoft;
 using Flurl.Http.Testing;
 using System.Threading.Tasks;
+using Flurl.Http.Configuration;
+using Newtonsoft.Json;
 
 namespace Flurl.Test.Http
 {
@@ -43,7 +46,7 @@ public async Task can_get_dynamic_list() {
 	}
 
 	[TestFixture, Parallelizable]
-	public class NewtonsofPostTests : PostTests
+	public class NewtonsoftPostTests : PostTests
 	{
 		protected override HttpTest CreateHttpTest() => base.CreateHttpTest()
 			.WithSettings(settings => settings.JsonSerializer = new NewtonsoftJsonSerializer());
@@ -73,4 +76,33 @@ public async Task can_receive_json_dynamic_list() {
 			Assert.AreEqual("Claire", data[1].name);
 		}
 	}
+
+	[TestFixture, Parallelizable]
+	public class NewtonsoftConfigTests
+	{
+		[Test]
+		public void can_register_with_builder() {
+			var cache = new FlurlClientCache();
+			var cli = cache.GetOrAdd("foo", null, builder => builder.UseNewtonsoft(new JsonSerializerSettings { DateFormatString = "1234" }));
+
+			Assert.IsInstanceOf<NewtonsoftJsonSerializer>(cli.Settings.JsonSerializer);
+
+			var obj = new { Date = DateTime.Now };
+			var json = cli.Settings.JsonSerializer.Serialize(obj);
+			Assert.AreEqual("{\"Date\":\"1234\"}", json);
+		}
+
+		[Test]
+		public void can_register_with_cache() {
+			var cache = new FlurlClientCache().UseNewtonsoft(new JsonSerializerSettings { DateFormatString = "1234" });
+			var cli = cache.GetOrAdd("foo");
+
+			Assert.IsInstanceOf<NewtonsoftJsonSerializer>(cli.Settings.JsonSerializer);
+
+			var obj = new { Date = DateTime.Now };
+			var json = cli.Settings.JsonSerializer.Serialize(obj);
+			Assert.AreEqual("{\"Date\":\"1234\"}", json);
+		}
+
+	}
 }