c# - Passing parameters from Detail to MainViewModel in MVVMCross -

i have 2 views : mainview , detailview. have list of items display , when user select item , passing item properties detailviewmodel , user able update these values.

everything works far, wonder how passing updated values mainviewmodel ?

mainviewmodel.cs

public mainviewmodel selecteditem {   { return _selecteditem; }   set   {     _selecteditem = value;     showviewmodel<detailviewmodel>(     new detailviewmodel.parameter     {         date = date,         age = _selecteditem.age,         category = _selecteditem.category,         discount = _selecteditem.discount,       }      );      raisepropertychanged(() => selecteditem);   } } 

detailviewmodel.cs

public class detailviewmodel: mvxviewmodel {     public double age { get; set; }     public double category { get; set; }     public double discount { get; set; }      public class parameter     {         public datetime date { get; set; }         public double age { get; set; }         public int category{ get; set; }         public double discount { get; set; }     }      public void init(parameter param)     {         age = param.age;         category = param.category;         discount = param.discount ;     } } 

one way pass variables between viewmodels messenger based solution.

mvvmcross messenger can found in nuget.

mainviewmodel

private readonly imvxmessenger _messenger; private readonly mvxsubscriptiontoken _token;  public mainviewmodel(imvxmessenger messenger) {      _messenger = messenger;     _token = messenger.subscribe<selecteditemmessage>(onmessagereceived);; }  private void onmessagereceived(selecteditemmessage obj) {     selecteditem = obj.selecteditem; } 

detailviewmodel

private readonly imvxmessenger _messenger;  public detailviewmodel(imvxmessenger messenger) {     _messenger = messenger; }  public void yourupdatemethod() {     var message = new selecteditemmessage(this, selecteditem); //selecteditem assumed viewmodel property.     _messenger.publish(message, typeof(selecteditemmessage)); } 

selecteditemmessage

public class selecteditemmessage : mvxmessage {     public selecteditemmessage(object sender, selecteditem selecteditem) : base(sender)     {         selecteditem = selecteditem;     }      public selecteditem selecteditem { get; set; } } 

take @ http://slodge.blogspot.nl/2013/05/n9-getting-message-n1-days-of-mvvmcross.html full guide mvvmcross messenges.

edit using age , category in message

public selecteditemmessage(object sender, double age, int category) : base(sender)     {         age = age;         category = category;     }      public double age { get; set; }     public int category{ get; set; } } 

changing mainviewmodel onmessagereceived method

private void onmessagereceived(selecteditemmessage obj) {     age = obj.age;     category= obj.category; }