WPF 自动选择dll,以SQLite为例

 1 class Entrance : Application
 2     {
 3         [STAThread]
 4         static void Main()
 5         {
 6             string dll32 = @".\SQLitedll\System.Data.SQLite32.dll";
 7             string dll64 = @".\SQLitedll\System.Data.SQLite64.dll";
 8             string dllpath = @".\System.Data.SQLite.dll";
 9 
10             if (IntPtr.Size == 8)
11             {
12                 using (FileStream fs=File.Create(dllpath)){}
13                 File.Copy(dll64,dllpath,true);
14             }
15             else if(IntPtr.Size == 4)
16             {
17                 using (FileStream fs=File.Create(dllpath)){}
18                 File.Copy(dll32,dllpath,true);
19             }
20             else
21             {MessageBox.Show("ERROR!");}
22             //start up the main window
23             Application app = new Application();
24             MainWindow window = new MainWindow();
25             app.Run(window);
26         }
27     }

 1 private void Button_Click(object sender, RoutedEventArgs e)
 2         {
 3             string strconn = @"Data Source=.\student.db;Version=3";
 4             string strcmd = "select * from stu";
 5             SQLiteConnection con = new SQLiteConnection(strconn);
 6             try
 7             {
 8                 con.Open();
 9             }
10             catch (Exception ex)
11             { MessageBox.Show(ex.ToString()); }
12 
13 
14             SQLiteCommand cmd = new SQLiteCommand(strcmd, con);
15 
16 
17             cmd.ExecuteNonQuery();
18 
19             SQLiteDataAdapter dataApp = new SQLiteDataAdapter(cmd);
20             DataTable dt = new DataTable("a");
21             dataApp.Fill(dt);
22             dataGrid1.ItemsSource = dt.DefaultView;
23             dataApp.Update(dt);
24             con.Close();
25         }
26     }