Unable to use csharp-sqlite in dll with VFS because of sqlite3_file as partial class

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What steps will reproduce the problem?
VFS usually needs add data to sqlite3_file class, while define sqlite3_file as 
partial class instead of base class make it impossible to add data when using 
pre-built csharp-sqlite dll.

I think change the parameter "Sqlite3.sqlite3_file db" of xOpen function as 
output parameter and let each VFS derive from sqlite3_file class and create the 
object in xOpen would fix it.


What version of the product are you using? On what operating system?
3771

Please provide any additional information below.

Original issue reported on code.google.com by brigh...@gmail.com on 10 Mar 2012 at 4:12