-Fix XmlNodeConverter handling of nested arrays when converting to XML

Src/Newtonsoft.Json.Tests/Converters/XmlNodeConverterTest.cs

@@ -465,6 +465,52 @@ namespace Newtonsoft.Json.Tests.Converters
 
       Assert.AreEqual(@"<myRoot><count>773840</count><photos>773840</photos></myRoot>", newDoc.InnerXml);
     }
+
+    [Test]
+    public void NestedArrays()
+    {
+      string json = @"{
+  ""available_sizes"": [
+    [
+      ""assets/images/resized/0001/1070/11070v1-max-150x150.jpg"",
+      ""assets/images/resized/0001/1070/11070v1-max-150x150.jpg""
+    ],
+    [
+      ""assets/images/resized/0001/1070/11070v1-max-250x250.jpg"",
+      ""assets/images/resized/0001/1070/11070v1-max-250x250.jpg""
+    ]
+  ]
+}";
+
+      XmlDocument newDoc = (XmlDocument)JsonConvert.DeserializeXmlNode(json, "myRoot");
+
+      Assert.AreEqual(@"<myRoot><available_sizes><available_sizes>assets/images/resized/0001/1070/11070v1-max-150x150.jpg</available_sizes><available_sizes>assets/images/resized/0001/1070/11070v1-max-150x150.jpg</available_sizes></available_sizes><available_sizes><available_sizes>assets/images/resized/0001/1070/11070v1-max-250x250.jpg</available_sizes><available_sizes>assets/images/resized/0001/1070/11070v1-max-250x250.jpg</available_sizes></available_sizes></myRoot>", newDoc.InnerXml);
+    }
+
+    [Test]
+    public void MultipleNestedArraysToXml()
+    {
+      string json = @"{
+  ""available_sizes"": [
+    [
+      [113, 150],
+      ""assets/images/resized/0001/1070/11070v1-max-150x150.jpg""
+    ],
+    [
+      [189, 250],
+      ""assets/images/resized/0001/1070/11070v1-max-250x250.jpg""
+    ],
+    [
+      [341, 450],
+      ""assets/images/resized/0001/1070/11070v1-max-450x450.jpg""
+    ]
+  ]
+}";
+
+      XmlDocument newDoc = (XmlDocument)JsonConvert.DeserializeXmlNode(json, "myRoot");
+
+      Assert.AreEqual(@"<myRoot><available_sizes><available_sizes><available_sizes>113</available_sizes><available_sizes>150</available_sizes></available_sizes><available_sizes>assets/images/resized/0001/1070/11070v1-max-150x150.jpg</available_sizes></available_sizes><available_sizes><available_sizes><available_sizes>189</available_sizes><available_sizes>250</available_sizes></available_sizes><available_sizes>assets/images/resized/0001/1070/11070v1-max-250x250.jpg</available_sizes></available_sizes><available_sizes><available_sizes><available_sizes>341</available_sizes><available_sizes>450</available_sizes></available_sizes><available_sizes>assets/images/resized/0001/1070/11070v1-max-450x450.jpg</available_sizes></available_sizes></myRoot>", newDoc.InnerXml);
+    }
   }
 }
 #endif

Src/Newtonsoft.Json/Converters/XmlNodeConverter.cs

@@ -355,6 +355,20 @@ namespace Newtonsoft.Json.Converters
             string elementPrefix = GetPrefix(propertyName);
             Dictionary<string, string> attributeNameValues = new Dictionary<string, string>();
 
+            if (reader.TokenType == JsonToken.StartArray)
+            {
+              XmlElement nestedArrayElement = CreateElement(propertyName, document, elementPrefix, manager);
+
+              currentNode.AppendChild(nestedArrayElement);
+
+              while (reader.Read() && reader.TokenType != JsonToken.EndArray)
+              {
+                DeserializeValue(reader, document, manager, propertyName, nestedArrayElement);
+              }
+
+              return;
+            }
+
             // a string token means the element only has a single text child
             if (reader.TokenType != JsonToken.String
               && reader.TokenType != JsonToken.Null
@@ -402,9 +416,7 @@ namespace Newtonsoft.Json.Converters
 
             // have to wait until attributes have been parsed before creating element
             // attributes may contain namespace info used by the element
-            XmlElement element = (!string.IsNullOrEmpty(elementPrefix))
-                    ? document.CreateElement(propertyName, manager.LookupNamespace(elementPrefix))
-                    : document.CreateElement(propertyName);
+            XmlElement element = CreateElement(propertyName, document, elementPrefix, manager);
 
             currentNode.AppendChild(element);
 
@@ -464,6 +476,13 @@ namespace Newtonsoft.Json.Converters
       }
     }
 
+    private XmlElement CreateElement(string elementName, XmlDocument document, string elementPrefix, XmlNamespaceManager manager)
+    {
+      return (!string.IsNullOrEmpty(elementPrefix))
+               ? document.CreateElement(elementName, manager.LookupNamespace(elementPrefix))
+               : document.CreateElement(elementName);
+    }
+
     private void DeserializeNode(JsonReader reader, XmlDocument document, XmlNamespaceManager manager, XmlNode currentNode)
     {
       do