C＃Windows应用程序附件文件名

Question

I have a working SQL connection here:

SqlConnection conn = 
   new SqlConnection(@"server=localhost\SQLEXPRESS;
                       AttachDbFilename=C:\Seach ENGINE (June 22, 2015)\SE\SE\MainDatabase.mdf;
                       Integrated Security=True;User Instance=True");

but the problem is I need to provide the complete path. Unlike asp.net, all I have to do is to add |DataDirectory| to it and include the database name ..

Then I tried to use the |DataDirectory| in this connection string and I get an error:

invalid value for key 'attachDbFilename'

I published my application and I can't locate the database now because I installed it in a different computer.. so the attachDbFilename is not true ..

If the DataDirectory is not working is there any other code that I can use similar to data directory?

Answer 1

AttachDbFilename is used with local database. If you have remote database then the connection string will be different . Have a look at article - How to configure SQL Server 2005 to allow remote connections.

Access mdf file

As you see here

System.Data.SqlClient resolves the substitution strings into full paths against the local computer file system. Therefore, remote server, HTTP, and UNC path names are not supported. An exception is thrown when the connection is opened if the server is not located on the local computer.

If you want to connect to an already-running SQL Server Express instance on another computer over TCP, then you need to set-up TCP connections on that server first. Note that you cannot use AttachDbFilename either because that option only applies to "user instances" of SQL Server Express.

Hope this will help you.

Answer 2

SqlConnection require you to specify the fully-qualified name of the db that is being attached.
No way around that.