在阅读数据时检查数据库：

int value = MySqlReader.IsDBNull(columnIndex) ? defaultValue : MySqlReader.GetInt32(columnIndex);

try
{
    Conn.Open();
    MySqlReader = cmd.ExecuteReader();
    while (MySqlReader.Read())
    {
        // Example of reading an integer, with a check for DBNull
        int someColumnValue = MySqlReader.IsDBNull(columnIndex) ? 0 : MySqlReader.GetInt32(columnIndex);
        // Process other columns similarly
    }
}
catch (Exception ex)
{

// Log the exception details for debugging
Console.WriteLine(ex.Message);

}
finally
{
    // Close the reader and connection if open
    MySqlReader?.Close();
    Conn?.Close();
}

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