Initial commit

LineMessaging/Extensions/DateTimeExtensions.cs

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+using System;
+
+namespace LineMessaging
+{
+    internal static class DateTimeExtensions
+    {
+        private static readonly DateTimeOffset UnixEpochDateTimeOffset = new DateTimeOffset(1970, 1, 1, 0, 0, 0, TimeSpan.Zero);
+        private static readonly DateTime UnixEpochDateTime = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
+
+        internal static DateTime FromUnixTime(this long unixTime)
+        {
+            return UnixEpochDateTime.AddMilliseconds(unixTime).ToLocalTime();
+        }
+    }
+}

LineMessaging/Extensions/DictionaryExtensions.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace LineMessaging
+{
+    internal static class DictionaryExtensions
+    {
+        internal static string ToQueryString(this Dictionary<string, object> source)
+        {
+            if (source == null) throw new ArgumentNullException();
+            if (source.Count == 0) return string.Empty;
+            return "?" + string.Join("&", source.Select(x => $"{x.Key}={x.Value}"));
+        }
+    }
+}