Merge pull request #146 from cnblogs/fix/string-deserialize-null

fix: fix string.Empty consistency issue

Author: cnblogs-dudu

Enyim.Caching.Tests/MemcachedClientGetTests.cs

@@ -111,6 +111,16 @@ public void When_Getting_SByte_Result_Is_Successful()
             GetAssertPass(getResult, expectedValue);
         }
 
+        [Fact]
+        public async Task When_Getting_Empty_String_Async_Result_Is_Successful()
+        {
+            var key = GetUniqueKey("Get");
+            var empty = string.Empty;
+            Store(key: key, value: empty);
+            var getResult = await _client.GetValueAsync<string>(key);
+            Assert.Equal(getResult, empty);
+        }
+
         [Fact]
         public async Task GetValueOrCreateAsyncTest()
         {
@@ -132,7 +142,7 @@ private Task<IEnumerable<BlogPost>> GenerateValue()
             var posts = new List<BlogPost>()
             {
                 new BlogPost{ Title = "test title 1", Body = "test body 1" },
-                new BlogPost{ Title = "test title 2", Body = "test body 2" }
+                new BlogPost{ Title = "test title 2", Body = "test body 2" },
             };
 
             return Task.FromResult(posts.AsEnumerable());

Enyim.Caching/Memcached/Transcoders/DefaultTranscoder.cs

@@ -30,8 +30,6 @@ object ITranscoder.Deserialize(CacheItem item)
 
         public virtual T Deserialize<T>(CacheItem item)
         {
-            if (item.Data == null || item.Data.Count == 0) return default(T);
-
             if (typeof(T).GetTypeCode() != TypeCode.Object || typeof(T) == typeof(Byte[]))
             {
                 var value = Deserialize(item);