submodule对gitea不管用，所以直接拉了一份拉格兰

Lagrange.Core/Lagrange.Core.Test/Utility/Tlv.cs

@@ -0,0 +1,35 @@
+using System.Text;
+using Lagrange.Core.Utility.Extension;
+using static Lagrange.Core.Utility.Binary.BitConverter;
+
+namespace Lagrange.Core.Test.Utility;
+
+public static class Tlv
+{
+    public static Dictionary<string, string> GetTlvDictionary(byte[] tlvs, bool isCommand = true)
+    {
+        var result = new Dictionary<string, string>();
+        
+        using var reader = new BinaryReader(new MemoryStream(tlvs));
+
+        ushort command;
+        if (isCommand)
+        {
+            command = ToUInt16(reader.ReadBytes(2), false);
+        }
+
+        ushort tlvCount = ToUInt16(reader.ReadBytes(2), false);
+        
+        for (int i = 0; i < tlvCount; i++)
+        {
+            ushort tlvTag = ToUInt16(reader.ReadBytes(2), false);
+            ushort tlvLength = ToUInt16(reader.ReadBytes(2), false);
+            byte[] tlvValue = reader.ReadBytes(tlvLength);
+            
+            result.Add($"0x{tlvTag:X} {tlvLength}", tlvValue.Hex());
+            result.Add($"0x{tlvTag:X} UTF8 {tlvLength}", Encoding.UTF8.GetString(tlvValue));
+        }
+
+        return result;
+    }
+}