C# ASP.Net MySql选择错误

我在我的asp.net网站上运行此功能：

private static DataTable GetData(string query)
{
    string strConnString = "SERVER=localhost;DATABASE=database;UID=root;PASSWORD=123456789;";
    using (SqlConnection con = new SqlConnection(strConnString))
    {
        using (SqlCommand cmd = new SqlCommand())
        {
            cmd.CommandText = query;
            using (SqlDataAdapter sda = new SqlDataAdapter())
            {
                cmd.Connection = con;
                sda.SelectCommand = cmd;
                using (DataSet ds = new DataSet())
                {
                    DataTable dt = new DataTable();
                    sda.Fill(dt);
                    return dt;
                }
            }
        }
    }
}

使用此查询：

"select * from Client where id='"+ customerId +"'"

我得到一个例外：

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)

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知道什么可以解决这个问题吗？

连接Mysql，试试以下方法：

*添加Mysql.Data.dll，读取

*在页面顶部添加此行

using MySql.Data.MySqlClient;

并尝试此编辑方法：

private static DataTable GetData(string query)
{
    string strConnString = "SERVER=localhost;DATABASE=database;UID=root;PASSWORD=123456789;";
    using (MySqlConnection con = new MySqlConnection(strConnString))
    {
        using (MySqlCommand cmd = new MySqlCommand())
        {
            cmd.CommandText = query;
            using (MySqlDataAdapter sda = new MySqlDataAdapter())
            {
                cmd.Connection = con;
                sda.SelectCommand = cmd;
                using (DataSet ds = new DataSet())
                {
                    DataTable dt = new DataTable();
                    sda.Fill(dt);
                    return dt;
                }
            }
        }
    }
}

---

连接Mysql时，请尝试以下操作：

*添加Mysql.Data.dll，读取

*在页面顶部添加此行

using MySql.Data.MySqlClient;

并尝试此编辑方法：

private static DataTable GetData(string query)
{
    string strConnString = "SERVER=localhost;DATABASE=database;UID=root;PASSWORD=123456789;";
    using (MySqlConnection con = new MySqlConnection(strConnString))
    {
        using (MySqlCommand cmd = new MySqlCommand())
        {
            cmd.CommandText = query;
            using (MySqlDataAdapter sda = new MySqlDataAdapter())
            {
                cmd.Connection = con;
                sda.SelectCommand = cmd;
                using (DataSet ds = new DataSet())
                {
                    DataTable dt = new DataTable();
                    sda.Fill(dt);
                    return dt;
                }
            }
        }
    }
}

---

您可以使用MySQLWorkbench或HeidiSQL之类的程序连接到数据库吗？如果是，查询（当

customerId

被实际数据替换时）是否正确执行？SqlConnection用于连接到MS SQL Server，而不是连接到mysql@IlyaBursov您可以编写答案……asp.net代码是否与SQL Server（本地主机）在同一台计算机上运行？您是否可以使用MySQLWorkbench或HeidiSQL之类的程序连接到数据库？如果是，查询（当

customerId

被实际数据替换时）是否正确执行？SqlConnection用于连接到MS SQL Server，而不是连接到mysql@IlyaBursov您可以编写答案……asp.net代码是否与SQL Server（本地主机）在同一台计算机上运行？