How to use RelayCommand for LoadMoreCommand using MVVM CommunityToolkit in .NET MAUI Chat (SfChat)?

This article provides a guide on implementing the LoadMoreCommand in the .NET MAUI SfChat component using the MVVM CommunityToolkit approach with RelayCommand. Using MVVM CommunityToolkit with RelayCommand simplifies command handling in SfChat, ensuring clean code, automatic command generation, and efficient chat loading functionality.

XAML

 <sfchat:SfChat x:Name="sfChat" CanAutoScrollToBottom="False"
               Messages="{Binding Messages}" CurrentUser="{Binding CurrentUser}" 
               MessageSpacing="24" MessageShape="RoundedRectangle"
               LoadMoreBehavior="{Binding LoadMoreBehavior}" 
               IsLazyLoading="{Binding IsBusy}"
               LoadMoreCommand="{Binding LoadMoreItemsCommand}">
 </sfchat:SfChat>

ViewModel

 // Determines that determines if the command(LoadMoreItems) can execute.
 private bool CanLoadMoreItems()
 {
     // If messages are still there in the old message collection then execute the load more command.
     if (this.OldMessages.Count > 0)
     {
         return true;
     }
     else
     {
         this.LoadMoreBehavior = LoadMoreOption.None;
         IsBusy = false;
         return false;
     }

     return true;
 }

 // Executes the command to load more chat messages asynchronously.
 
 [RelayCommand (CanExecute = nameof(CanLoadMoreItems))]
 public async void LoadMoreItems()
 {
     try
     {
         // Set is busy as true to show the busy indicator
         this.IsBusy = true;
         await Task.Delay(3000);
         LoadMoreMessages();
     }
     catch { }
     finally
     {
         // Set is busy as false to hide the busy indicator
         IsBusy = false;
     }
 }

Download the complete sample from GitHub.

Conclusion:

I hope you enjoyed learning how to use RelayCommand for LoadMoreCommand using MVVM CommunityToolkit in .NET MAUI Chat.

You can refer to our .NET MAUI SfChat feature tour page to know about its other groundbreaking feature representations and documentation, and how to quickly get started with configuration specifications.

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