How to Refresh CollectionView from another Content View (Template) Xamarin Forms

Question

Good Day All

I have CollectionView view defined like this

<CollectionView x:Name="LstShares" >
<CollectionView.ItemTemplate>
<DataTemplate>
<StackLayout>
<template:SharesViewTemplate />
</StackLayout>
</DataTemplate>
</CollectionView.ItemTemplate>
</CollectionView>

In the Template "template:SharesViewTemplate" i want to refresh the LstShares , by calling the same function that binded it .

Thanks

Answer 1

Hello,

Welcome to our Microsoft Q&A platform!

A simple method is to use Xamarin.Forms MessagingCenter to achieve this.

In your page, Subscribe message as follows(PersonCell is my ViewCell):

	public HomePage ()  
	{  
		InitializeComponent ();  

		MessagingCenter.Subscribe<PersonCell,object>(this, "AddItem", (obj, item) =>  
		{  
			//var newItem = item as VeggieViewModel;  


		});  
	}  

In ViewCell, send message:

  public partial class PersonCell : ViewCell  
{  
    public PersonCell()  
    {  
        InitializeComponent();  

        object obj = new object();  

        MessagingCenter.Send(this, "AddItem", obj);  
    }  
}  

For more details, check: https://learn.microsoft.com/en-us/xamarin/xamarin-forms/app-fundamentals/messaging-center

Best Regards,

Jessie Zhang

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