如何创建非绝对连接字符串，以便我的小型数据库可以与已发布的C＃应用​​程序一起使用？

Question

I'm working on a small project to track information. This C# application will take information uploaded via CSV/Excel and store/sort it.

My current connection string is an absolute path (off thumb drive). I'm worried that when I publish it, the database connection won't work on a random users computer.

            <add name="PPP_Project.Properties.Settings.Database1ConnectionString"
        connectionString="Data Source=.\SQLEXPRESS;AttachDbFilename=E:\Other PPP Projects\PPP_Project_Test\PPP_Project\Database1.mdf;Integrated Security=True;User Instance=True"
        providerName="System.Data.SqlClient" />

How do I have this set so it will work when the application is published?

Answer 1

you can use this:

Data Source=.\SQLEXPRESS;AttachDbFileName=|DataDirectory|Customers.mdf;Integrated Security=True;User Instance=True

as described here . For a winform application, the default |DataDirectory| is the same where the application is installed. Of course you can use aa a part of a more nested path. If you want to specifyng something else you can use the AppDomain.SetData method.

Answer 2

The easiest way to manipulate connection strings is with the ConnectionStringBuilder classes:

OleStringBuilder = new OleDbConnectionStringBuilder(@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\MyExcel.xls;Extended Properties='Excel 8.0;HDR=Yes;IMEX=1';");

OleStringBuilder.DataSource = MapPath(@"~\App_Datav\MyExcelWorksheet.xls");