ArcGIS Pro 二次开发添加连接，断开连接，导入mxd

 #region AddFolderConnectionProjectItem

      /// Add a folder connection to a project
      Item folderToAdd = ItemFactory.Instance.Create(@"C:\gisoracle\Oregon\Counties\Streets");
      bool wasAdded = await QueuedTask.Run(() => Project.Current.AddItem(folderToAdd as IProjectItem));

      #endregion //AddFolderConnectionProjectItem

      #region AddGDBProjectItem

      /// Add a file geodatabase or a SQLite or enterprise database connection to a project
      Item gdbToAdd = folderToAdd.GetItems().FirstOrDefault(folderItem => folderItem.Name.Equals("gisoracle.gdb"));
      var addedGeodatabase = await QueuedTask.Run(() => Project.Current.AddItem(gdbToAdd as IProjectItem));

      #endregion //AddGDBProjectItem



      #region RemoveFolderConnectionFromProject

      /// Remove a folder connection from a project; the folder stored on the local disk 
      /// or the network is not deleted
      FolderConnectionProjectItem folderToRemove = Project.Current.GetItems<FolderConnectionProjectItem>().FirstOrDefault(folder => folder.Name.Equals("PlantSpecies"));
      if (folderToRemove != null)
        Project.Current.RemoveItem(folderToRemove as IProjectItem);

      #endregion //RemoveFolderConnectionFromProject

      #region RemoveMapFromProject

      /// Remove a map from a project; the map is deleted
      IProjectItem mapToRemove = Project.Current.GetItems<MapProjectItem>().FirstOrDefault(map => map.Name.Equals("OldStreetRoutes"));
      var removedMapProjectItem = await QueuedTask.Run(
               () => Project.Current.RemoveItem(mapToRemove));

      #endregion //RemoveMapFromProject



      #region ImportToProject

      /// Import a mxd
      Item mxdToImport = ItemFactory.Instance.Create(@"C:\Projects\RegionalSurvey\LatestResults.mxd");
      var addedMxd = await QueuedTask.Run(
                    () => Project.Current.AddItem(mxdToImport as IProjectItem));

      /// Add map package      
      Item mapPackageToAdd = ItemFactory.Instance.Create(@"c:\Data\Map.mpkx");
      var addedMapPackage = await QueuedTask.Run(
                    () => Project.Current.AddItem(mapPackageToAdd as IProjectItem));

      /// Add an exported Pro map
      Item proMapToAdd = ItemFactory.Instance.Create(@"C:\ExportedMaps\Election\Districts.mapx");
      var addedMapProjectItem = await QueuedTask.Run(
                    () => Project.Current.AddItem(proMapToAdd as IProjectItem));