小编Ada*_*amA的帖子

我有用 C# 编写的 MySql (MariaDB 5.5.5-10.11.0) 的简单连接字符串：

MySqlConnection Database = new MySqlConnection("Server=127.0.0.1; Port=3306; Database=test; Uid=user; Pwd=MyPassword; Ssl Mode=Required; convert zero datetime=True;");

在两台计算机（Windows 10 和 Windows 11）上一切正常。但是当我尝试在 Windows Server 2022 上启动此应用程序时，出现此错误：

System.InvalidCastException: Object cannot be cast from DBNull to other types.
   at System.DBNull.System.IConvertible.ToInt32(IFormatProvider provider)
   at System.Convert.ToInt32(Object value, IFormatProvider provider)
   at MySql.Data.MySqlClient.Driver.LoadCharacterSets(MySqlConnection connection)
   at MySql.Data.MySqlClient.Driver.Configure(MySqlConnection connection)
   at MySql.Data.MySqlClient.MySqlConnection.Open()
   at MariaDB.Program.StartAPI()

Database.Open() 抛出错误；

MariaDB 已安装并正在运行，Ssl 正在工作，用户权限已授予，端口正确。有什么想法吗？

整个程序：

using System;
using MySql.Data.MySqlClient;

namespace MariaDB
{
    internal class Program
    {
        MySqlConnection Database = new MySqlConnection("Server=127.0.0.1; …

我在 Flutter 中有代码：

  Widget build(BuildContext context) {
    return ListView(
      children: [
        Container(
          margin: EdgeInsets.only(left: 15, right: 15, top: 30),
          child: Text("Enter your phone",
              style: TextStyle(fontSize: 16)),
        ),
        Container(
          margin: EdgeInsets.only(left: 15, right: 15),
          child: TextField(
            controller: phoneNumber,
            keyboardType: TextInputType.number,
            autofillHints: [AutofillHints.telephoneNumberNational],
            inputFormatters: <TextInputFormatter>[
              FilteringTextInputFormatter.digitsOnly,
            ],
            decoration: InputDecoration(
              border: UnderlineInputBorder(),
              labelText: "Phone",
              labelStyle: TextStyle(color: Colors.black),
              icon: Icon(Icons.phone_outlined),
            ),
          ),
        ),

        Container(
          margin: EdgeInsets.only(left: 15, right: 15, top: 20),
          child: Text("You will receive code in SMS",
              style: TextStyle(fontSize: 16)),
        ),
        Container(
            margin: …