你的代码是什么?你引用的是什么client? sqlclient ?如果是System.Data.SqlClient ,则应该如下。private static void OpenSqlConnection() { string connectionString = GetConnectionString(); using (SqlConnection connection = new SqlConnection(connectionString)) { connection.Open(); Console.WriteLine("ServerVersion: {0}", connection.ServerVersion); Console.WriteLine("State: {0}", connection.State); } }static private string GetConnectionString() { // To avoid storing the connection string in your code, // you can retrieve it from a configuration file, using the // System.Configuration.ConfigurationSettings.AppSettings property return "Data Source=(local);Initial Catalog=AdventureWorks;" + "Integrated Security=SSPI;"; }
{
string connectionString = GetConnectionString();
using (SqlConnection connection = new SqlConnection(connectionString))
{
connection.Open();
Console.WriteLine("ServerVersion: {0}", connection.ServerVersion);
Console.WriteLine("State: {0}", connection.State);
}
}static private string GetConnectionString()
{
// To avoid storing the connection string in your code,
// you can retrieve it from a configuration file, using the
// System.Configuration.ConfigurationSettings.AppSettings property
return "Data Source=(local);Initial Catalog=AdventureWorks;"
+ "Integrated Security=SSPI;";
}
using System.Data.SqlClient;
或者不写provider
oledb是连access,excel,provider=Microsoft.Jet.OleDb.4.0;