LinkPickerMode is now properly serialized when using JSON.net

By default, an enum value will be serialized to a numeric value. The mode is now serialized to a lowercase string instead - eg. "content" or "url".

src/Skybrud.LinkPicker/Json/Converters/LinkPickerEnumConverter.cs

@@ -0,0 +1,29 @@
+using System;
+using Newtonsoft.Json;
+
+namespace Skybrud.LinkPicker.Json.Converters {
+
+    public class LinkPickerEnumConverter : JsonConverter {
+
+        public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer) {
+
+            if (value == null) {
+                writer.WriteNull();
+                return;
+            }
+
+            writer.WriteValue((value + "").ToLower());
+
+        }
+
+        public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer) {
+            throw new NotImplementedException();
+        }
+
+        public override bool CanConvert(Type objectType) {
+            return objectType == typeof(Enum);
+        }
+
+    }
+
+}

src/Skybrud.LinkPicker/LinkPickerMode.cs

@@ -1,8 +1,12 @@
-namespace Skybrud.LinkPicker {
+using Newtonsoft.Json;
+using Skybrud.LinkPicker.Json.Converters;
+
+namespace Skybrud.LinkPicker {
 
     /// <summary>
     /// Enum describing the type of the link.
     /// </summary>
+    [JsonConverter(typeof(LinkPickerEnumConverter))]
     public enum LinkPickerMode {
 
         /// <summary>

src/Skybrud.LinkPicker/Skybrud.LinkPicker.csproj

@@ -266,6 +266,7 @@
     <Compile Include="Grid\Converters\LinkPickerGridConverter.cs" />
     <Compile Include="Grid\Values\GridControlLinkPickerValue.cs" />
     <Compile Include="Grid\Config\GridEditorLinkPickerConfig.cs" />
+    <Compile Include="Json\Converters\LinkPickerEnumConverter.cs" />
     <Compile Include="LinkPickerItem.cs" />
     <Compile Include="LinkPickerList.cs" />
     <Compile Include="LinkPickerMode.cs" />