diff --git a/Masuit.Tools/Extensions.cs b/Masuit.Tools/Extensions.cs
index 3fc8783..cab9343 100644
--- a/Masuit.Tools/Extensions.cs
+++ b/Masuit.Tools/Extensions.cs
@@ -590,7 +590,7 @@ namespace Masuit.Tools
 
             if (ignoreCase)
             {
-                return Regex.IsMatch(s.ToLower(), string.Join("|", keys).ToLower());
+                return Regex.IsMatch(s, string.Join("|", keys), RegexOptions.IgnoreCase);
             }
 
             return Regex.IsMatch(s, string.Join("|", keys));
diff --git a/Masuit.Tools/Net/MultiThreadDownloader.cs b/Masuit.Tools/Net/MultiThreadDownloader.cs
index 0a8457d..6507014 100644
--- a/Masuit.Tools/Net/MultiThreadDownloader.cs
+++ b/Masuit.Tools/Net/MultiThreadDownloader.cs
@@ -370,7 +370,6 @@ namespace Masuit.Tools.Net
         /// <summary>
         /// 获取内容长度
         /// </summary>
-        /// <param name="url"></param>
         /// <param name="rangeAllowed"></param>
         /// <param name="redirectedUrl"></param>
         /// <returns></returns>