Moved the ExifHeader property to after the constructor to satisfy StyleCop.

src/ImageSharp/Formats/Png/PngDecoderCore.cs

@@ -112,12 +112,6 @@ namespace SixLabors.ImageSharp.Formats.Png
         /// </summary>
         private PngChunk? nextChunk;
 
-        /// <summary>
-        /// "Exif" and two zero bytes. Used for the legacy exif parsing.
-        /// </summary>
-        // This uses C# compiler's optimization to refer to the static data directly, no intermediate array allocations happen.
-        private static ReadOnlySpan<byte> ExifHeader => new byte[] { 0x45, 0x78, 0x69, 0x66, 0x00, 0x00 };
-
         /// <summary>
         /// Initializes a new instance of the <see cref="PngDecoderCore"/> class.
         /// </summary>
@@ -130,6 +124,12 @@ namespace SixLabors.ImageSharp.Formats.Png
             this.ignoreMetadata = options.IgnoreMetadata;
         }
 
+        /// <summary>
+        /// Gets the sequence of bytes for the exif header ("Exif" ASCII and two zero bytes). Used for the legacy exif parsing.
+        /// </summary>
+        // This uses C# compiler's optimization to refer to the static data directly, no intermediate array allocations happen.
+        private static ReadOnlySpan<byte> ExifHeader => new byte[] { 0x45, 0x78, 0x69, 0x66, 0x00, 0x00 };
+
         /// <inheritdoc/>
         public Configuration Configuration { get; }