C＃：DBConnection.Open（）超时太长

Question

I'm trying to connect to a server that the user inputs. When the server doesn't exist, I'd like to give a quick feedback to the end-user so he can correct what he's typed.

Is there any way to test if a server exists before trying to connect ?

Thanks

Answer 1

ConnectionTimeout property in DbConnection does not have setter. It waits for 15 seconds. You need to specify the timeout in your connection string. "Connection Timeout" in the connection string is in seconds.

string connStr = "Data Source=(local);Initial Catalog=AdventureWorks;" +
                 "Integrated Security=SSPI;Connection Timeout=5";

Answer 2

Does your DBConnection have a ConnectionTimeout property? Try setting this to a small number.

Answer 3

You can use SQL Server Management Objects (SMO) to get a list of SQL Servers. There is a sample of how to get a list of servers here . The enumeration of the servers can take a while but you could always start it in the background when the application loads so that it is ready when the user needs to select a server.

Answer 4

您始终可以ping服务器或检查给定端口是否已打开]但这并不能保证此服务器在连接到真实之前不会脱机。