diff --git a/src/DotNetCore.CAP/Infrastructure/Helper.cs b/src/DotNetCore.CAP/Infrastructure/Helper.cs
index f0b274a..1574886 100644
--- a/src/DotNetCore.CAP/Infrastructure/Helper.cs
+++ b/src/DotNetCore.CAP/Infrastructure/Helper.cs
@@ -7,96 +7,106 @@ using Newtonsoft.Json.Linq;
 
 namespace DotNetCore.CAP.Infrastructure
 {
-    public static class Helper
-    {
-        private static readonly DateTime Epoch = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Local);
-        private static JsonSerializerSettings _serializerSettings;
-
-        public static void SetSerializerSettings(JsonSerializerSettings setting)
-        {
-            _serializerSettings = setting;
-        }
-
-        public static string ToJson(object value)
-        {
-            return value != null
-                ? JsonConvert.SerializeObject(value, _serializerSettings)
-                : null;
-        }
-
-        public static T FromJson<T>(string value)
-        {
-            return value != null
-                ? JsonConvert.DeserializeObject<T>(value, _serializerSettings)
-                : default(T);
-        }
-
-        public static object FromJson(string value, Type type)
-        {
-            if (type == null) throw new ArgumentNullException(nameof(type));
-
-            return value != null
-                ? JsonConvert.DeserializeObject(value, type, _serializerSettings)
-                : null;
-        }
-
-        public static long ToTimestamp(DateTime value)
-        {
-            var elapsedTime = value - Epoch;
-            return (long) elapsedTime.TotalSeconds;
-        }
-
-        public static DateTime FromTimestamp(long value)
-        {
-            // ReSharper disable once ImpureMethodCallOnReadonlyValueField
-            return Epoch.AddSeconds(value);
-        }
-
-        public static bool IsController(TypeInfo typeInfo)
-        {
-            if (!typeInfo.IsClass)
-                return false;
-
-            if (typeInfo.IsAbstract)
-                return false;
-
-            if (!typeInfo.IsPublic)
-                return false;
-
-            return !typeInfo.ContainsGenericParameters
-                   && typeInfo.Name.EndsWith("Controller", StringComparison.OrdinalIgnoreCase);
-        }
-
-        public static bool IsComplexType(Type type)
-        {
-            return !CanConvertFromString(type);
-        }
-
-        public static string AddJsonProperty(string json, IList<KeyValuePair<string, string>> properties)
-        {
-            var jObj = JObject.Parse(json);
-            foreach (var property in properties)
-                jObj.Add(new JProperty(property.Key, property.Value));
-            return jObj.ToString();
-        }
-
-        private static bool CanConvertFromString(Type destinationType)
-        {
-            destinationType = Nullable.GetUnderlyingType(destinationType) ?? destinationType;
-            return IsSimpleType(destinationType) ||
-                   TypeDescriptor.GetConverter(destinationType).CanConvertFrom(typeof(string));
-        }
-
-        private static bool IsSimpleType(Type type)
-        {
-            return type.GetTypeInfo().IsPrimitive ||
-                   type == typeof(decimal) ||
-                   type == typeof(string) ||
-                   type == typeof(DateTime) ||
-                   type == typeof(Guid) ||
-                   type == typeof(DateTimeOffset) ||
-                   type == typeof(TimeSpan) ||
-                   type == typeof(Uri);
-        }
-    }
+	public static class Helper
+	{
+		private static readonly DateTime Epoch = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Local);
+		private static JsonSerializerSettings _serializerSettings;
+
+		public static void SetSerializerSettings(JsonSerializerSettings setting)
+		{
+			_serializerSettings = setting;
+		}
+
+		public static string ToJson(object value)
+		{
+			return value != null
+				? JsonConvert.SerializeObject(value, _serializerSettings)
+				: null;
+		}
+
+		public static T FromJson<T>(string value)
+		{
+			return value != null
+				? JsonConvert.DeserializeObject<T>(value, _serializerSettings)
+				: default(T);
+		}
+
+		public static object FromJson(string value, Type type)
+		{
+			if (type == null) throw new ArgumentNullException(nameof(type));
+
+			return value != null
+				? JsonConvert.DeserializeObject(value, type, _serializerSettings)
+				: null;
+		}
+
+		public static long ToTimestamp(DateTime value)
+		{
+			var elapsedTime = value - Epoch;
+			return (long)elapsedTime.TotalSeconds;
+		}
+
+		public static DateTime FromTimestamp(long value)
+		{
+			// ReSharper disable once ImpureMethodCallOnReadonlyValueField
+			return Epoch.AddSeconds(value);
+		}
+
+		public static bool IsController(TypeInfo typeInfo)
+		{
+			if (!typeInfo.IsClass)
+				return false;
+
+			if (typeInfo.IsAbstract)
+				return false;
+
+			if (!typeInfo.IsPublic)
+				return false;
+
+			return !typeInfo.ContainsGenericParameters
+				   && typeInfo.Name.EndsWith("Controller", StringComparison.OrdinalIgnoreCase);
+		}
+
+		public static bool IsComplexType(Type type)
+		{
+			return !CanConvertFromString(type);
+		}
+
+		public static string AddJsonProperty(string json, IList<KeyValuePair<string, string>> properties)
+		{
+			var jObj = JObject.Parse(json);
+			foreach (var property in properties)
+			{
+				if (jObj.TryGetValue(property.Key, out var _))
+				{
+					jObj[property.Key] = property.Value;
+				}
+				else
+				{
+					jObj.Add(new JProperty(property.Key, property.Value));
+				}
+			}
+
+			return jObj.ToString();
+		}
+
+		private static bool CanConvertFromString(Type destinationType)
+		{
+			destinationType = Nullable.GetUnderlyingType(destinationType) ?? destinationType;
+			return IsSimpleType(destinationType) ||
+				   TypeDescriptor.GetConverter(destinationType).CanConvertFrom(typeof(string));
+		}
+
+		private static bool IsSimpleType(Type type)
+		{
+			return type.GetTypeInfo().IsPrimitive ||
+				   type == typeof(decimal) ||
+				   type == typeof(string) ||
+				   type == typeof(DateTime) ||
+				   type == typeof(Guid) ||
+				   type == typeof(DateTimeOffset) ||
+				   type == typeof(TimeSpan) ||
+				   type == typeof(Uri);
+		}
+	}
 }
\ No newline at end of file