Use C# 11 UTF-8 string literals.

Author: bgrainger

src/MySqlConnector/Core/ServerSession.cs

@@ -1919,7 +1919,7 @@ protected override void OnStatementBegin(int index)
 		private readonly string m_sql;
 	}
 
-	private static ReadOnlySpan<byte> BeginCertificateBytes => new byte[] { 45, 45, 45, 45, 45, 66, 69, 71, 73, 78, 32, 67, 69, 82, 84, 73, 70, 73, 67, 65, 84, 69, 45, 45, 45, 45, 45 }; // -----BEGIN CERTIFICATE-----
+	private static ReadOnlySpan<byte> BeginCertificateBytes => "-----BEGIN CERTIFICATE-----";
 	private static readonly IMySqlConnectorLogger Log = MySqlConnectorLogManager.CreateLogger(nameof(ServerSession));
 	private static readonly PayloadData s_setNamesUtf8NoAttributesPayload = QueryPayload.Create(false, "SET NAMES utf8;");
 	private static readonly PayloadData s_setNamesUtf8mb4NoAttributesPayload = QueryPayload.Create(false, "SET NAMES utf8mb4;");

src/MySqlConnector/Core/ServerVersion.cs

@@ -39,7 +39,7 @@ public ServerVersion(ReadOnlySpan<byte> versionString)
 		if (versionString.Length != 0 && versionString[0] == 0x2D)
 		{
 			versionString = versionString.Slice(1);
-			ReadOnlySpan<byte> mariaDb = new byte[] { 0x2D, 0x4D, 0x61, 0x72, 0x69, 0x61, 0x44, 0x42 }; // -MariaDB
+			ReadOnlySpan<byte> mariaDb = "-MariaDB";
 			var mariaDbIndex = versionString.IndexOf(mariaDb);
 			if (mariaDbIndex != -1)
 			{

src/MySqlConnector/Core/SingleCommandPayloadCreator.cs

@@ -249,19 +249,19 @@ private static bool WriteCommand(IMySqlCommand command, ByteBufferWriter writer,
 		var isSingleRow = (command.CommandBehavior & CommandBehavior.SingleRow) != 0;
 		if (isSchemaOnly)
 		{
-			ReadOnlySpan<byte> setSqlSelectLimit0 = new byte[] { 83, 69, 84, 32, 115, 113, 108, 95, 115, 101, 108, 101, 99, 116, 95, 108, 105, 109, 105, 116, 61, 48, 59, 10 }; // SET sql_select_limit=0;\n
+			ReadOnlySpan<byte> setSqlSelectLimit0 = "SET sql_select_limit=0;\n";
 			writer.Write(setSqlSelectLimit0);
 		}
 		else if (isSingleRow)
 		{
-			ReadOnlySpan<byte> setSqlSelectLimit1 = new byte[] { 83, 69, 84, 32, 115, 113, 108, 95, 115, 101, 108, 101, 99, 116, 95, 108, 105, 109, 105, 116, 61, 49, 59, 10 }; // SET sql_select_limit=1;\n
+			ReadOnlySpan<byte> setSqlSelectLimit1 = "SET sql_select_limit=1;\n";
 			writer.Write(setSqlSelectLimit1);
 		}
 		var preparer = new StatementPreparer(command.CommandText!, command.RawParameters, command.CreateStatementPreparerOptions() | ((appendSemicolon || isSchemaOnly || isSingleRow) ? StatementPreparerOptions.AppendSemicolon : StatementPreparerOptions.None));
 		var isComplete = preparer.ParseAndBindParameters(writer);
 		if (isComplete && (isSchemaOnly || isSingleRow))
 		{
-			ReadOnlySpan<byte> clearSqlSelectLimit = new byte[] { 10, 83, 69, 84, 32, 115, 113, 108, 95, 115, 101, 108, 101, 99, 116, 95, 108, 105, 109, 105, 116, 61, 100, 101, 102, 97, 117, 108, 116, 59 }; // \nSET sql_select_limit=default;
+			ReadOnlySpan<byte> clearSqlSelectLimit = "\nSET sql_select_limit=default;";
 			writer.Write(clearSqlSelectLimit);
 		}
 		return isComplete;

src/MySqlConnector/MySqlBulkCopy.cs

@@ -448,7 +448,7 @@ static bool WriteValue(MySqlConnection connection, object value, ref int inputIn
 
 			if (value is null || value == DBNull.Value)
 			{
-				ReadOnlySpan<byte> escapedNull = new byte[] { 0x5C, 0x4E };
+				ReadOnlySpan<byte> escapedNull = @"\N"; // a field value of \N is read as NULL for input
 				if (output.Length < escapedNull.Length)
 				{
 					bytesWritten = 0;
@@ -672,7 +672,7 @@ static bool WriteSubstring(string value, ref int inputIndex, ref Encoder? utf8En
 
 		static bool WriteBytes(ReadOnlySpan<byte> value, ref int inputIndex, Span<byte> output, out int bytesWritten)
 		{
-			ReadOnlySpan<byte> hex = new byte[] { (byte) '0', (byte) '1', (byte) '2', (byte) '3', (byte) '4', (byte) '5', (byte) '6', (byte) '7', (byte) '8', (byte) '9', (byte) 'A', (byte) 'B', (byte) 'C', (byte) 'D', (byte) 'E', (byte) 'F' };
+			ReadOnlySpan<byte> hex = "0123456789ABCDEF";
 			bytesWritten = 0;
 			for (; inputIndex < value.Length && output.Length > 2; inputIndex++)
 			{

src/MySqlConnector/MySqlParameter.cs

@@ -199,7 +199,7 @@ internal void AppendSqlString(ByteBufferWriter writer, StatementPreparerOptions
 
 		if (Value is null || Value == DBNull.Value)
 		{
-			ReadOnlySpan<byte> nullBytes = new byte[] { 0x4E, 0x55, 0x4C, 0x4C }; // NULL
+			ReadOnlySpan<byte> nullBytes = "NULL";
 			writer.Write(nullBytes);
 		}
 #if NET45
@@ -316,8 +316,8 @@ internal void AppendSqlString(ByteBufferWriter writer, StatementPreparerOptions
 		}
 		else if (Value is bool boolValue)
 		{
-			ReadOnlySpan<byte> trueBytes = new byte[] { 0x74, 0x72, 0x75, 0x65 }; // true
-			ReadOnlySpan<byte> falseBytes = new byte[] { 0x66, 0x61, 0x6C, 0x73, 0x65 }; // false
+			ReadOnlySpan<byte> trueBytes = "true";
+			ReadOnlySpan<byte> falseBytes = "false";
 			writer.Write(boolValue ? trueBytes : falseBytes);
 		}
 		else if (Value is float or double)
@@ -825,7 +825,7 @@ private static void WriteTime(ByteBufferWriter writer, TimeSpan timeSpan)
 		}
 	}
 
-	private static ReadOnlySpan<byte> BinaryBytes => new byte[] { 0x5F, 0x62, 0x69, 0x6E, 0x61, 0x72, 0x79, 0x27 }; // _binary'
+	private static ReadOnlySpan<byte> BinaryBytes => "_binary'";
 
 	private DbType m_dbType;
 	private MySqlDbType m_mySqlDbType;