From 1173c2b22c5c012b90feefc186f1890bca254da2 Mon Sep 17 00:00:00 2001
From: yedajiang44 <602830483@qq.com>
Date: Sun, 16 Jun 2024 12:12:17 +0800
Subject: [PATCH] fix build error

---
 src/JT809.Protocol/MessagePack/JT809MessagePackReader.cs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/JT809.Protocol/MessagePack/JT809MessagePackReader.cs b/src/JT809.Protocol/MessagePack/JT809MessagePackReader.cs
index af7282f..6380e7a 100644
--- a/src/JT809.Protocol/MessagePack/JT809MessagePackReader.cs
+++ b/src/JT809.Protocol/MessagePack/JT809MessagePackReader.cs
@@ -76,7 +76,7 @@ namespace JT809.Protocol.MessagePack
                 allocateBuffer[offset++] = tmp;
             }
             Reader = allocateBuffer.Slice(0, offset);
-            _realCheckCRCCode = (ushort)((Reader[^3] << 8) | Reader[^2]);
+            _realCheckCRCCode = (ushort)((Reader[Reader.Length - 3] << 8) | Reader[Reader.Length - 2]);
             _checkCRCCodeVali = _calculateCheckCRCCode == _realCheckCRCCode;
             _decoded = true;
         }