🎨 U8

Author: AigioL

src/BD.Common8.Bcl/Collections/Generic/Utf8StringComparerOrdinalIgnoreCase.cs

@@ -8,7 +8,10 @@ public sealed class Utf8StringComparerOrdinalIgnoreCase : IEqualityComparer<byte
     /// <summary>
     /// Initializes a new instance of the <see cref="Utf8StringComparerOrdinalIgnoreCase"/> class.
     /// </summary>
-    public Utf8StringComparerOrdinalIgnoreCase() { }
+    Utf8StringComparerOrdinalIgnoreCase() { }
+
+    public static readonly IEqualityComparer<byte> Instance =
+        new Utf8StringComparerOrdinalIgnoreCase();
 
     // https://www.geeksforgeeks.org/lower-case-upper-case-interesting-fact/
 

src/BD.Common8.Bcl/Formats/FileFormat.AnalyzeFileType.cs

@@ -53,7 +53,7 @@ public static AnalyzeFileTypeResult AnalyzeFileType(ReadOnlyMemory<byte> buffer)
             return FileEx.SQLite;
         }
 
-        Utf8StringComparerOrdinalIgnoreCase comparer = new();
+        var comparer = Utf8StringComparerOrdinalIgnoreCase.Instance;
         // 根据文件头识别一些文件类型使用正确的文件扩展名
         var magicNumber = "<html"u8;
         if (magicNumber.SequenceEqual(buffer.Span[..magicNumber.Length], comparer))