diff --git a/src/dotnetCampus.SourceYard/Context/MultiTargetingPackageInfo.cs b/src/dotnetCampus.SourceYard/Context/MultiTargetingPackageInfo.cs
index 02889c2c32245b2aa5ce92dccb85de02e1aa6120..01ce89d636e8e38e4c5c6ea92906ddf4d2e17cc3 100644
--- a/src/dotnetCampus.SourceYard/Context/MultiTargetingPackageInfo.cs
+++ b/src/dotnetCampus.SourceYard/Context/MultiTargetingPackageInfo.cs
@@ -45,7 +45,7 @@ namespace dotnetCampus.SourceYard.Context
                     return true;
                 }
 
-                if (targetFrameworks != null && string.IsNullOrWhiteSpace(targetFrameworks) is false)
+                if (targetFrameworks != null && !string.IsNullOrWhiteSpace(targetFrameworks))
                 {
                     // 对于单框架，也许 targetFrameworks 的值是空字符串
                     if (!targetFrameworks.Contains(t.TargetFramework))