prs/prs.mobile/comal.timesheets/CustomControls/Selection Screens/EmployeeSelectionPage.cs

using System;
using System.Linq;
using Xamarin.Forms;

namespace comal.timesheets
{
    public class EmployeeSelectionPage : SelectionPage
    {
        public EmployeeSelectionPage(Action<EmployeeShell> action) 
            : base(
                "SelectEmployee", 
                SelectionPageMode.Immediate,
                (columns) =>
                {
                    columns
                        .BeginUpdate()
                        .Clear()
                        .Add(new MobileGridTextColumn<EmployeeShell>()
                            { Column = x => x.Code, Width = GridLength.Auto })
                        .Add(new MobileGridTextColumn<EmployeeShell>()
                            { Column = x => x.Name, Width = GridLength.Star })
                        .EndUpdate();

                }, 
                (refresh) => App.Data.Employees.Refresh(refresh),
                (items) => action?.Invoke(items.FirstOrDefault() as EmployeeShell)
            ) { }
    }
}