-Fixed serializing FileInfo/DirectoryInfo on .NET Core with JsonConverter

Src/Newtonsoft.Json.Tests/Issues/Issue1619.cs

@@ -0,0 +1,86 @@
+#region License
+// Copyright (c) 2007 James Newton-King
+//
+// Permission is hereby granted, free of charge, to any person
+// obtaining a copy of this software and associated documentation
+// files (the "Software"), to deal in the Software without
+// restriction, including without limitation the rights to use,
+// copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the
+// Software is furnished to do so, subject to the following
+// conditions:
+//
+// The above copyright notice and this permission notice shall be
+// included in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+// OTHER DEALINGS IN THE SOFTWARE.
+#endregion
+
+using System;
+using System.IO;
+#if DNXCORE50
+using Xunit;
+using Test = Xunit.FactAttribute;
+using Assert = Newtonsoft.Json.Tests.XUnitAssert;
+#else
+using NUnit.Framework;
+#endif
+
+namespace Newtonsoft.Json.Tests.Issues
+{
+    [TestFixture]
+    public class Issue1619 : TestFixtureBase
+    {
+        [Test]
+        public void Test()
+        {
+            Foo value = new Foo
+            {
+                Bar = new DirectoryInfo(@"c:\temp")
+            };
+
+            string json = JsonConvert.SerializeObject(value, new DirectoryInfoJsonConverter());
+            Assert.AreEqual(@"{""Bar"":""c:\\temp""}", json);
+        }
+
+        public class Foo
+        {
+            public DirectoryInfo Bar { get; set; }
+        }
+
+        public class DirectoryInfoJsonConverter : JsonConverter
+        {
+            public override bool CanConvert(Type objectType)
+            {
+                return objectType == typeof(DirectoryInfo);
+            }
+
+            public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
+            {
+                if (reader.Value is string s)
+                {
+                    return new DirectoryInfo(s);
+                }
+
+                throw new ArgumentOutOfRangeException(nameof(reader));
+            }
+
+            public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
+            {
+                if (!(value is DirectoryInfo directoryInfo))
+                {
+                    throw new ArgumentOutOfRangeException(nameof(value));
+                }
+
+                writer.WriteValue(directoryInfo.FullName);
+            }
+        }
+    }
+}

Src/Newtonsoft.Json/Serialization/DefaultContractResolver.cs

@@ -313,13 +313,6 @@ namespace Newtonsoft.Json.Serialization
         /// <returns>A <see cref="JsonObjectContract"/> for the given type.</returns>
         protected virtual JsonObjectContract CreateObjectContract(Type objectType)
         {
-            // serializing DirectoryInfo without ISerializable will stackoverflow
-            // https://github.com/JamesNK/Newtonsoft.Json/issues/1541
-            if (Array.IndexOf(BlacklistedTypeNames, objectType.FullName) != -1)
-            {
-                throw new JsonSerializationException("Unable to serialize instance of '{0}'.".FormatWith(CultureInfo.InvariantCulture, objectType));
-            }
-
             JsonObjectContract contract = new JsonObjectContract(objectType);
             InitializeContract(contract);
 
@@ -404,9 +397,21 @@ namespace Newtonsoft.Json.Serialization
                 SetExtensionDataDelegates(contract, extensionDataMember);
             }
 
+            // serializing DirectoryInfo without ISerializable will stackoverflow
+            // https://github.com/JamesNK/Newtonsoft.Json/issues/1541
+            if (Array.IndexOf(BlacklistedTypeNames, objectType.FullName) != -1)
+            {
+                contract.OnSerializingCallbacks.Add(ThrowUnableToSerializeError);
+            }
+
             return contract;
         }
 
+        private static void ThrowUnableToSerializeError(object o, StreamingContext context)
+        {
+            throw new JsonSerializationException("Unable to serialize instance of '{0}'.".FormatWith(CultureInfo.InvariantCulture, o.GetType()));
+        }
+
         private MemberInfo GetExtensionDataMemberForType(Type type)
         {
             IEnumerable<MemberInfo> members = GetClassHierarchyForType(type).SelectMany(baseType =>