无法使用C＃连接到MySQL数据库； 错误状态：18

Question

Below is the code I used to try to connect to a remote MySQL server. I've connected to this server with a Python script using pymysql but I am unable to connect to it with Visual Studios. The application is "fully trusted" in visual studios. When I run this, I get System.InvalidOperationException stating an internal connection fatal error.

 using System; using System.Collections.Generic; using System.Linq; using System.Text.RegularExpressions; using System.Data.SqlClient; namespace Rextester { public class Program { public static void Main(string[] args) { //Your code goes here Console.WriteLine("Hello, world!!"); SqlConnection myConnection = new SqlConnection("User ID={UserID};" + "password={Password};Data Source=sql9.freesqldatabase.com, 3306;" + "Trusted_Connection=yes;" + "Initial Catalog=sql9159612; " + "connection timeout=30"); try { myConnection.Open(); Console.WriteLine("Opened connection"); } catch(Exception e) { Console.WriteLine("Can't open connection"); Console.WriteLine(e.ToString()); } } } } 

Answer 1

First, you'll want to download the MySql.Data package from Nuget.

Then take out ",3306" from the Data Source, and also remove the Trusted_Connection element...

var myConnection = new MySqlConnection("User ID={UserId};" +
                                                   "password={Password};Data Source=sql9.freesqldatabase.com;" +
                                                   "Initial Catalog={database}; " +
                                                   "connection timeout=30");

(I remove some of the sensitive information, fyi...)