Silverlight client memo → server data synchronization memo code

# Region  Synchronization unit  Void  Syncunit () {progresscontent =  "Synchronization unit ..."  ;  VaR  Query = context. getunitsquery (). Where (P => P. shopuniqueid =  App  . Currentshop. uniqueid); context. Load (query, loadunitcallback,  Null  );}  Void  Loadunitcallback (  Loadoperation <  Rp_unit  > Loadop ){  // Server data  Ienumerable  <  Rp_unit  > Serverunits = context. rp_units;  // Client data  Ienumerable  <  Rp_unit  > Clientunits;  // Obtain data  Using  ( VaR  Helper =  New  Localdb.  Unithelper  () {Clientunits = helper. getlist ();}  // Obtain the intersection to synchronize the existing and updated objects.  VaR  Intersectunits = serverunits. Intersect (clientunits,  New  Unitentitycompare  ());  // Traverse the Intersection Set  Foreach  ( VaR  Item  In  Intersectunits ){  // Obtain the data to be updated on the server and the client based on the items in the intersection.  VaR  Serverunittoupdate = serverunits. First (P => P. uniqueid = item. uniqueid );  VaR  Clientunittoupdate = clientunits. First (P => P. uniqueid = item. uniqueid );  // Compare the update time. If the update time is the same, ignore the operation.  If  (Clientunittoupdate. updatedate! = Serverunittoupdate. updatedate ){ // Update the client if the server is newer  If  (Clientunittoupdate. updatedate <serverunittoupdate. updatedate ){  Using  (  VaR  Helper =  New  Localdb.  Unithelper  () {Helper. updateunit (serverunittoupdate );}}  // Otherwise, update the server  Else {Serverunittoupdate. updatedate = clientunittoupdate. updatedate; serverunittoupdate. namecn = clientunittoupdate. namecn; serverunittoupdate. nameen = clientunittoupdate. nameen ;}}}  // Obtain the difference set between the server and the client to synchronize entities that do not exist on the server or client.  VaR  Effectserver = serverunits. clientt (clientunits,  New  Unitentitycompare  ());  // Traverse the difference set. // you do not need to use foreach because you want to modify the set.  For  (  Int I =  0  ; I <effectserver. Count (); I ++ ){  VaR  Item = effectserver. elementat (I );  // If the last local update time is before the data update time, add the data to the client  If  (! Clientshopinfo. lastupdatedate. hasvalue | clientshopinfo. lastupdatedate <servershopinfo. lastupdatedate ){  Using  (  VaR  Helper =  New  Localdb. Unithelper  () {Helper. addunit (item );}}  // Otherwise, the data has been deleted from the local database and deleted from the server database.  Else  {Context. rp_units.remove (item );}}  // Obtain the difference set between the server and the client to synchronize entities that do not exist on the server or client.  VaR  Required tclient = clientunits. Capacity T (serverunits,  New  Unitentitycompare  ());  // Traverse the difference set. // you do not need to use foreach because you want to modify the set.  Foreach (  VaR  Item  In  Required tclient ){  // If the last local update time is before the data update time, remove the data from the client  If  (Clientshopinfo. lastupdatedate <servershopinfo. lastupdatedate ){  Using  (  VaR  Helper =  New  Localdb.  Unithelper () {Helper. deleteunit (item );}}  // Otherwise, the client data is added to the server.  Else  {Context. rp_units.add (item) ;}} syncoperations. Remove (  "Unit"  );}  # Endregion