c# - 我遇到以下错误 System.Data.SqlClient.SqlException : in C#

Question

这个问题已经有答案了:

Problems connecting to local MySQL server (1 个回答)

已关闭 3 年前。

我正在尝试制作一个程序，用于在 MySQL 数据库中输入/编辑和删除用户。数据库是外部的。

我曾多次尝试更改 SqlConnection

con = new SqlConnection ("Data Source = ip /; Initial Catalog = u181542750_arsob; Integrated Security = True");

完成CODE PASTEBIN

private void button1_Click(object sender, EventArgs e)
{
    SqlConnection con = new SqlConnection("Data Source=sql34.main-hosting.eu;Initial Catalog=u181542750_arsob;Integrated Security=True");
    con.Open();
    cmd = new SqlCommand("INSERT INFO Archers (Nume,Prenume,Varsta,Sex,Categorie,E-mail,Telefon,CNP) VALUES (@Nume,@Prenume,@Varsta,@Sex,@Categorie,@E-mail,@Telefon,@CNP)", con);
    cmd.Parameters.AddWithValue("@Nume", textBox1.Text);
    cmd.Parameters.AddWithValue("@Prenume", textBox2.Text);
    cmd.Parameters.AddWithValue("@Varsta", textBox3.Text);
    cmd.Parameters.AddWithValue("@Sex", comboBox1.SelectedItem.ToString());
    cmd.Parameters.AddWithValue("@Categorie", comboBox2.SelectedItem.ToString());
    cmd.Parameters.AddWithValue("@E-mail", textBox4.Text);
    cmd.Parameters.AddWithValue("@Telefon", textBox5.Text);
    cmd.Parameters.AddWithValue("@CNP", textBox6.Text);
    cmd.ExecuteNonQuery();
}

System.Data.SqlClient.SqlException: 'A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)'

Win32Exception: The network path was not found

Answer 1

Ping 查看是否已启动

ping sql34.main-hosting.eu

检查您是否可以访问

telnet 31.220.20.81 1433

如果不能，则需要检查端口是否已关闭、是否有防病毒软件正在阻止、该服务器上未创建集成安全性(Windows 用户)或者它没有访问该数据库的权限。