Hi Giridhar,

I need to confirm your scenario:

• Multiple Picker bind to Category which include Sub Category and Team Detail when chosen
• A several single picker bind to each of them (Category, Sub Category, and Team Details)
• Multiple Picker to Category which when picked reveals choice based on category you choose
  

Hi Arief,

Yes. We need below scenario, 

A several single picker bind to each of them (Category, Sub Category, and Team Details) and each of them loaded based on parent data selection.

For Example, 

1. Category records loaded from category master.
2. Sub-Category records loaded based on category selection.
3. Team details records loaded based on category and sub-category selection 

Please let us know, how to pass list itemsource from one view model to another view model? 

Hi Arief,

We have binded more than one pickerview in single page by calling separate view model for each picker view. 

Please confirm whether it is right way?

We need to pass the list item source from main view to picker view model. Please let us know how to pass the list/collection from one view model to another view model.

Hi Giridhar,

Yes your method is already on point,

Here is how to pass value between ViewModel:

First of all, you actually don't need to pass all the list items, you only need to pass the on that user choose, if you are using form you can see that all the value are stored in here:

public class YourFormViewModel: EditorViewModelBase<SearchParameter>    {
        public YourFormViewModel()
        {
	     // you can access all of your user input in this.Item which can be called anywhere 
        }
}

Here is the inside of my SearchParameter (this just an example you don't need to copy exactly like mine)

    public class SearchParameter : ModelBase
    {
private Category _category;
private SubCategory _subCategory;
private TeamDetail _teamDetail

public Category Category
        {
            get
            {
                return _category;
            }
            set
            {
                if (_category!= value)
                {
                    _category= value;
                    OnPropertyChanged("Category");
                }
            }
        }
public SubCategory SubCategory
        {
            get
            {
                return _subCategory;
            }
            set
            {
                if (_subCategory!= value)
                {
                    _subCategory= value;
                    OnPropertyChanged("SubCategory");
                }
            }
        }
public TeamDetail TeamDetail 
        {
            get
            {
                return _teamDetail;
            }
            set
            {
                if (_teamDetail!= value)
                {
                    _teamDetail= value;
                    OnPropertyChanged("TeamDetail");
                }
            }
        }
}

here is my SubCategorySelectionViewModel:

public class SubCategorySelectionViewModel : ListViewModelBase<Category>
{
      public override async void Navigated(NavigatedParameter parameter)
      {
         if (parameter.Sender is SearchFormViewModel){
         {  
           YourFormViewModel viewModel = parameter.Sender as YourFormViewModel;
           //If you use DataListViewModel and query definition you can simply use this
           //this.ViewQuery = viewModel.Item.Category.Id;

           //If you use ListViewModel you can use this:
           //QueryDescriptor queryDescriptor = new QueryDescriptor();
            //SelectParameter selectParameter = new SelectParameter();
            //selectParameter.QueryDescriptor = queryDescriptor;
           //var searchResult = await this.SubCategoryRepositort.GetAllAsync(selectParameter);
            //searchResult = searchResult.where(x => x.Id == viewModel.Item.Category.Id).ToList()
         }

         base.Navigated(parameter); //all of this must be done before base!
          
       }
}

So the passing value actually happening in the parent ViewModel, this way you only need to obtain what customer choose rather all of the list.

Hope that will helps!