如何使用MVVM将数据库加载到wpf中的TreeView

     using (DataConnectionDialog dlg = new DataConnectionDialog())
      {

      DataSource.AddStandardDataSources(dlg);
      DataConnectionDialog.Show(dlg).ToString().Equals("OK");
      DataProvider provider = dlg.SelectedDataProvider;
     BcpConfig.DatabaseClient = provider.Name    ;
      string sqlDatabase = ConfigurationManager.AppSettings[provider.Name];
       BcpConfig..Database = DatabaseFactory.CreateDb(dlg.ConnectionString, sqlDatabase);
     using (DataConnectionDialog dlg = new D