无法连接到我的SQL Server数据库？

Question

I'm creating a very basic CRUD desktop winforms application in C#/.NET 4.0.

Letting Visual Studio auto-generate the fields for the table I'd like to perform my CRUD operations on works just fine, but I'm running into problems when I try and interact with it manually with my own SQL queries.

The auto-generated fields are using the connection string:

Data Source=|DataDirectory|\Data Analysis.sdf

If I try and do:

SqlConnection conn = new SqlConnection(@"Data Source=|DataDirectory|\Data Analysis.sdf");
conn.Open();

It just hangs. What am I missing?

Answer 1

That's a connection string for a SQL Server Compact Edition (CE) database (everything stored inside a single .sdf file) - is that what you're using?

If so : in that case, you'd have to use SqlCeConnection (not a SqlConnection - that's for "grown-up" SQL Server version - not CE)

Answer 2

Maybe try adding some more options to the connection string:

Persist Security Info=False;
File Mode=shared read;

Answer 3

相信您已经指定了.sdf文件的相对路径，您可能需要从System.Environment.CurrentDirectory获取可执行文件的运行时文件夹并将其添加到文件名中。