Migrate to dotnet8 and fix warnings

CsvLib/BufferedTextReader.cs

@@ -1,57 +1,52 @@
 using System.IO;
 using System.Text;
 
-namespace CsvLib
+namespace CsvLib;
+
+public class BufferedTextReader : TextReader
 {
-    public class BufferedTextReader : TextReader
+    private readonly TextReader _baseReader;
+    private readonly StringBuilder _sbBuffer = new();
+
+    private readonly Encoding _currentEncoding = Encoding.Default;
+
+    public BufferedTextReader(TextReader baseReader)
     {
-        private readonly TextReader _baseReader;
-        private int _position;
-        private readonly StringBuilder _sbBuffer = new();
-
-        private readonly Encoding _currentEncoding = Encoding.Default;
-
-        public BufferedTextReader(TextReader baseReader)
+        _baseReader = baseReader;
+        if (baseReader is StreamReader streamReader)
         {
-            _baseReader = baseReader;
-            if (baseReader is StreamReader streamReader)
-            {
-                _currentEncoding = streamReader.CurrentEncoding;
-            }
-        }
-
-        public override int Read()
-        {
-            int read = _baseReader.Read();
-            if (read > 127)
-            {
-                int count = _currentEncoding.GetByteCount(((char)read).ToString());
-                _position += count;
-            }
-            else
-            {
-                _position++;
-            }
-            if (read != -1)
-            {
-                _sbBuffer.Append((char)read);
-            }
-            return read;
-        }
-
-        public int Position
-        {
-            get { return _position; }
-        }
-
-        public string GetBuffer()
-        {
-            return _sbBuffer.ToString();
-        }
-
-        public void CleanBuffer()
-        {
-            _sbBuffer.Clear();
+            _currentEncoding = streamReader.CurrentEncoding;
         }
     }
-}
+
+    public override int Read()
+    {
+        int read = _baseReader.Read();
+        if (read > 127)
+        {
+            int count = _currentEncoding.GetByteCount(((char)read).ToString());
+            Position += count;
+        }
+        else
+        {
+            Position++;
+        }
+        if (read != -1)
+        {
+            _sbBuffer.Append((char)read);
+        }
+        return read;
+    }
+
+    public int Position { get; private set; }
+
+    public string GetBuffer()
+    {
+        return _sbBuffer.ToString();
+    }
+
+    public void CleanBuffer()
+    {
+        _sbBuffer.Clear();
+    }
+}