use SortedSetLength for zcount (#562)

Author: huoshan12345

src/EasyCaching.Redis/DefaultRedisCachingProvider.SortedSet.cs

@@ -38,7 +38,7 @@ public long ZCount(string cacheKey, double min, double max)
         {
             ArgumentCheck.NotNullOrWhiteSpace(cacheKey, nameof(cacheKey));
 
-            var len = _cache.SortedSetLengthByValue(cacheKey, min, max);
+            var len = _cache.SortedSetLength(cacheKey, min, max);
             return len;
         }
 
@@ -166,7 +166,7 @@ public async Task<long> ZCountAsync(string cacheKey, double min, double max)
         {
             ArgumentCheck.NotNullOrWhiteSpace(cacheKey, nameof(cacheKey));
 
-            var len = await _cache.SortedSetLengthByValueAsync(cacheKey, min, max);
+            var len = await _cache.SortedSetLengthAsync(cacheKey, min, max);
             return len;
         }