C# Can'；t连接到SQL Server-内部连接致命错误

我刚开始使用C#和Windows窗体，所以如果你看到一个很大的安全漏洞，请不要对我大喊大叫（我想知道）。每次运行此命令时，都会出现

内部连接致命错误

，堆栈跟踪如下：

System.InvalidOperationException: Internal connection fatal error.
   at System.Data.SqlClient.TdsParserStateObject.TryProcessHeader()
   at System.Data.SqlClient.TdsParserStateObject.TryPrepareBuffer()
   at System.Data.SqlClient.TdsParserStateObject.TryReadByteArray(Byte[] buff, Int32 offset, Int32 len, Int32& totalRead)
   at System.Data.SqlClient.TdsParser.ConsumePreLoginHandshake(Boolean encrypt, Boolean trustServerCert, Boolean integratedSecurity, Boolean& marsCapable)
   at System.Data.SqlClient.TdsParser.Connect(ServerInfo serverInfo, SqlInternalConnectionTds connHandler, Boolean ignoreSniOpenTimeout, Int64 timerExpire, Boolean encrypt, Boolean trustServerCert, Boolean integratedSecurity, Boolean withFailover)
   at System.Data.SqlClient.SqlInternalConnectionTds.AttemptOneLogin(ServerInfo serverInfo, String newPassword, SecureString newSecurePassword, Boolean ignoreSniOpenTimeout, TimeoutTimer timeout, Boolean withFailover)
   at System.Data.SqlClient.SqlInternalConnectionTds.LoginNoFailover(ServerInfo serverInfo, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance, SqlConnectionString connectionOptions, SqlCredential credential, TimeoutTimer timeout)
   at System.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist(TimeoutTimer timeout, SqlConnectionString connectionOptions, SqlCredential credential, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance)
   at System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, SqlCredential credential, Object providerInfo, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance, SqlConnectionString userConnectionOptions, SessionData reconnectSessionData)
   at System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, DbConnectionPoolKey poolKey, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection, DbConnectionOptions userOptions)
   at System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnectionPool pool, DbConnection owningObject, DbConnectionOptions options, DbConnectionPoolKey poolKey, DbConnectionOptions userOptions)
   at System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnection owningObject, DbConnectionOptions userOptions, DbConnectionInternal oldConnection)
   at System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnection owningObject, DbConnectionOptions userOptions, DbConnectionInternal oldConnection)
   at System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, UInt32 waitForMultipleObjectsTimeout, Boolean allowCreate, Boolean onlyOneCheckConnection, DbConnectionOptions userOptions, DbConnectionInternal& connection)
   at System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal& connection)
   at System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal oldConnection, DbConnectionInternal& connection)
   at System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions)
   at System.Data.ProviderBase.DbConnectionClosed.TryOpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions)
   at System.Data.SqlClient.SqlConnection.TryOpenInner(TaskCompletionSource`1 retry)
   at System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource`1 retry)
   at System.Data.SqlClient.SqlConnection.Open()
   at Program.Login.btnLogin_Click(Object sender, EventArgs e) in i:\Users\Me\Documents\visual studio 2013\Projects\Program\Program\Login.cs:line 57
   at System.Windows.Forms.Control.OnClick(EventArgs e)
   at System.Windows.Forms.Button.OnClick(EventArgs e)
   at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
   at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.ButtonBase.WndProc(Message& m)
   at System.Windows.Forms.Button.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

下面是它的代码：

            //Begin SQL connection
            using (SqlConnection conn = new SqlConnection("Data Source=tcp:**.**.**.**,3306;Initial Catalog=******;User ID=*****;Password=*****"))
            {
                conn.Open();

                string UserName = txtUsername.Text;

                string Password = txtPassword.Text;

                //Hash password
                System.Text.ASCIIEncoding encoder = new System.Text.ASCIIEncoding();
                byte[] buffer = encoder.GetBytes(Password);
                SHA1CryptoServiceProvider cryptoTransformSHA1 =
                new SHA1CryptoServiceProvider();
                string hash = BitConverter.ToString(
                    cryptoTransformSHA1.ComputeHash(buffer)).Replace("-", "");

                SqlCommand cmd = new SqlCommand("SELECT * FROM `users` WHERE `login` = @username AND password = @password", conn);
                cmd.Parameters.AddWithValue("username", UserName);
                cmd.Parameters.AddWithValue("password", hash);

                SqlDataAdapter da = new SqlDataAdapter(cmd);
                DataTable dt = new DataTable();
                da.Fill(dt);

                System.Data.SqlClient.SqlDataReader dr = null;
                dr = cmd.ExecuteReader();
                conn.Close();

                if (dr.Read())
                {

                    if (UserName == dr["username"].ToString() && hash == dr["password"].ToString())
                    {
                        Form1 f = new Form1();
                        f.Show();
                        this.Hide();
                    }
                    else
                    {
                        errorProvider1.SetError(txtUsername, "Your username and/or password are incorrect.");
                    }
                }
            }

---

尝试使用1433端口，它是用于MSSQL的，而不是3306端口，据我所知它是用于MySQL的。

如果您使用的是MySQL，那么您需要使用

MySQL.Data.MySqlClient.MySqlConnection

而不是

System.Data.SqlClient.SqlConnection

---

MySqlConnection

用于MySql数据库

SqlConnection

用于MSSql数据库。不要混淆两者。

在哪一行出现错误？@DavidG调试器在

conn.Open（）上给我一个
InvalidOperationException未处理的
错误行。我之前在配置SQL时遇到了一些问题，我认为通过使用tcp和添加端口可以使SQL正常工作。请查看以了解有效的SQL Server连接字符串的外观。你的闻起来像MySQL，不是SQLServer@marc_s是的，它是MySQL。我来自PHP，SQL是微风。SQL Server也是微风-如果你做得正确的话：-）我使用MySQL，而不是MSSQL。