Add JsConfig<T>.IncludeDefaultValue

Author: mythz

src/ServiceStack.Text/Common/WriteType.cs

@@ -147,7 +147,11 @@ private static bool Init()
                 int propertyOrder = -1;
                 var propertyType = propertyInfo.PropertyType;
                 var defaultValue = propertyType.GetDefaultValue();
-                bool propertySuppressDefaultConfig = defaultValue != null && propertyType.IsValueType() && !propertyType.IsEnum() && JsConfig.HasSerializeFn.Contains(propertyType);
+                bool propertySuppressDefaultConfig = defaultValue != null 
+                    && propertyType.IsValueType() 
+                    && !propertyType.IsEnum() 
+                    && JsConfig.HasSerializeFn.Contains(propertyType) 
+                    && !JsConfig.HasIncludeDefaultValue.Contains(propertyType);
                 bool propertySuppressDefaultAttribute = false;
 
                 var shouldSerialize = GetShouldSerializeMethod(propertyInfo);
@@ -198,7 +202,10 @@ private static bool Init()
                 int propertyOrder = -1;
                 var propertyType = fieldInfo.FieldType;
                 var defaultValue = propertyType.GetDefaultValue();
-                bool propertySuppressDefaultConfig = defaultValue != null && propertyType.IsValueType() && !propertyType.IsEnum() && JsConfig.HasSerializeFn.Contains(propertyType);
+                bool propertySuppressDefaultConfig = defaultValue != null 
+                    && propertyType.IsValueType() && !propertyType.IsEnum() 
+                    && JsConfig.HasSerializeFn.Contains(propertyType) 
+                    && !JsConfig.HasIncludeDefaultValue.Contains(propertyType);
                 bool propertySuppressDefaultAttribute = false;
 #if (NETFX_CORE)
                 var shouldSerialize = (Func<T, bool>)null;

src/ServiceStack.Text/JsConfig.cs

@@ -518,6 +518,8 @@ public static bool EscapeUnicode
 
         internal static HashSet<Type> HasSerializeFn = new HashSet<Type>();
 
+        internal static HashSet<Type> HasIncludeDefaultValue = new HashSet<Type>();
+
         public static HashSet<Type> TreatValueAsRefTypes = new HashSet<Type>();
 
         private static bool? sPreferInterfaces;
@@ -658,6 +660,10 @@ public static void Reset()
             {
                 Reset(rawSerializeType);
             }
+            foreach (var rawSerializeType in HasIncludeDefaultValue.ToArray())
+            {
+                Reset(rawSerializeType);
+            }
             foreach (var uniqueType in __uniqueTypes.ToArray())
             {
                 Reset(uniqueType);
@@ -688,6 +694,7 @@ public static void Reset()
             sIncludePublicFields = null;
             sReuseStringBuffer = null;
             HasSerializeFn = new HashSet<Type>();
+            HasIncludeDefaultValue = new HashSet<Type>();
             TreatValueAsRefTypes = new HashSet<Type> { typeof(KeyValuePair<,>) };
             sPropertyConvention = null;
             sExcludePropertyReferences = null;
@@ -755,6 +762,20 @@ public class JsConfig<T>
 
         public static bool? EmitLowercaseUnderscoreNames = null;
 
+        public static bool IncludeDefaultValue
+        {
+            get { return JsConfig.HasIncludeDefaultValue.Contains(typeof(T)); }
+            set
+            {
+                if (value)
+                    JsConfig.HasIncludeDefaultValue.Add(typeof(T));
+                else
+                    JsConfig.HasIncludeDefaultValue.Remove(typeof(T));
+
+                ClearFnCaches();
+            }
+        }
+
         /// <summary>
         /// Define custom serialization fn for BCL Structs
         /// </summary>

tests/ServiceStack.Text.Tests/JsonTests/CustomSerializerTests.cs

@@ -232,8 +232,11 @@ public void Can_deserialize_json_with_underscores()
                 dto.PrintDump();
             }
         }
+    }
 
-        [Test]
+    public class CustomSerailizerValueTypeTests
+    {
+        [Ignore("Need to clear static element caches"), Test]
         public void Can_serialize_custom_doubles()
         {
             JsConfig<double>.RawSerializeFn = d =>
@@ -249,5 +252,25 @@ public void Can_serialize_custom_doubles()
 
             Assert.That(doubles.ToJson(), Is.EqualTo("[0,1,\"-Inf\",\"NaN\",\"+Inf\"]"));
         }
+
+        public class Model
+        {
+            public int Int { get; set; }
+        }
+
+        [Test]
+        public void Can_serialize_custom_ints()
+        {
+            JsConfig<int>.IncludeDefaultValue = true;
+            JsConfig<int>.RawSerializeFn = i =>
+                i == 0 ? "-1" : i.ToString();
+
+            var dto = new Model { Int = 0 };
+
+            Assert.That(dto.ToJson(), Is.EqualTo("{\"Int\":-1}"));
+
+            JsConfig.Reset();
+        }
     }
+
 }