问题
I am getting a "Permission denied" exception when I connect to a .sdf file.
I am using this connection string.
connection string="Data Source=|DataDirectory|\DB.sdf;Password='something';Mode = Read Only;Temp Path= Environment.GetFolderPath(Environment.SpecialFolder.Templates);Persist Security Info=True"" providerName="System.Data.EntityClient" />
This is work fine on Win 7 but when I run my app on Win XP it returns
Permission denied
exception
I tried different address for temp file but it still failed.all of this options are true
- The paths to the Database File exist on the xp machine
- I have permission to create a temporary file in the given directory
- I'm supplying the right password.
This problem happens just when data base connection string set to read only.i find some solution but i can't use them:
solution 1:
Here is the scoop on this. When we move a SDF file from XP to Vista, because of a change in the NLS Version we attempt to open the file in read-write mode to rewrite the indexes if any exist. This happens only on the first open on the move from XP to Vista. So a simple work around for you is to temporarily change the file to read-write mode open it on Vista and revert it back to read-only.
I can't use this solution because my application run from DVD.
solution 2:
having 3 sdf files, one for XP/Server 2003 and one for Vista/Server 2008/Win7 and one for win 8
This is also awful,because i don't have free space on application DVD to do this.
any one have a good idea to solve this problem.
回答1:
Copy the file to somewhere it can be written, and remove the Read Only property from the file. Connect to this file.
Environment.SpecialFolder can be called with SpecialFolder.LocalApplicationData to get a suitable location.
Path.GetTempPath might also be useful in this regard.
回答2:
You will need to either have 2 copies of the database file on the DVD, one for XP/Server 2003, and one for Vista and later. Or copy the database to a writable location when the app is first launched. Same issue applies to SQL Server Compact 4.0
来源：https://stackoverflow.com/questions/13064441/permission-denied-for-sql-server-ce-on-win-xp