Tapping "Cancel" of a SearchBar is crashing the app in Xamarin.iOS project

Question

I have a search bar in my app. Along with x a clickable button named "Cancel" appears on iOS. No issues clicking the x to clear the text. But when I clicked the "Cancel" button the app is crashing. This "Cancel" buttone doesn't appear in Android. And there is no event name like "CancelClicked" for SearchBar.

Answer 1

@Wenyan Zhang (Shanghai Wicresoft Co,.Ltd.) I got the solution. Fortunately when I was debugging on a device, tapping the Cancel button broke in SearchBar_TextChanged event pointing to what element is null. It is none other than the SearchBar.Text. So testing for null before using it resolved the issue. The code is as below:

private void sbSearchData_TextChanged(object sender, TextChangedEventArgs e)  
{  
    SearchBar sb = (SearchBar)sender;  

    // This test is needed to avoid crashing of iOS app on  
    //    tapping the Cancel button that appears when something  
    //    is entered into the SearchBar's text box.  
    if (!string.IsNullOrEmpty(sb.Text))  
    {  
        itemsVM.searchFilter = sb.Text.Trim().ToLower();  
        itemsVM.LoadItemsCommand.Execute(null);  
    }