如何在Xamarin中删除从ListView中选择的项目

我正在构建Xamarin CrossPlatform应用程序！

应用包含2个页面：HomePage，DetailGetData

主页：此页面包含一个ListView，它在单元格中显示webapi数据列表，每当我单击每个单元格时，它就会转到DetailGetData显示该数据详细信息的页面。

问题：现在的问题是我想从DetailGetData页面中删除该选定项目。甲DeleteButton放置并当我按下该按钮的细节和选择的项应当从ListView的被删除。怎么可能？

屏幕截图DetailGetData：https ://i.stack.imgur.com/TXg4G.png

ScreenShot主页：https : //i.stack.imgur.com/g1Hn1.png

码：

DetailGetData Xaml：

 <?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="Last_MSPL.Views.DetailGetData">

    <StackLayout HorizontalOptions="Center" VerticalOptions="Center">

        <Label Text="{Binding employee_name}" x:Name="empname" FontSize="Medium" FontAttributes="Bold" />
        <Label Text="{Binding employee_age}" x:Name="age" FontSize="Medium" FontAttributes="Bold" />
        <Label Text="{Binding employee_salary}" x:Name="salary" FontSize="Medium" FontAttributes="Bold" />

        <Button x:Name="DeleteItem" Text="Delete" Clicked="DeleteItem_Clicked"  />
    </StackLayout>

</ContentPage>

主页Xaml：

    <?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="Last_MSPL.HomePage">


    <AbsoluteLayout HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand">
        <ListView x:Name="Demolist" ItemSelected="OnItemSelected" BackgroundColor="White">
            <ListView.ItemTemplate>
                <DataTemplate>
                    <ViewCell Height="100">
                        <ViewCell.ContextActions>
                            <MenuItem x:Name="OnMore" Clicked="OnMore_Clicked" CommandParameter="{Binding .}"
                                 Text="More" />
                            <MenuItem x:Name="OnDelete" Clicked="OnDelete_Clicked" CommandParameter="{Binding .}"
                                 Text="Delete" IsDestructive="True" />
                        </ViewCell.ContextActions>
                        <StackLayout HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand" Padding="30,0">

                            <Label Text="{Binding employee_name}" FontAttributes="bold" FontSize="Small" TextColor="Black" x:Name="en"/>
                            <Label Text="{Binding employee_age}" FontSize="Micro" TextColor="Black" FontAttributes="Italic"/>
                            <Label Text="{Binding id}" IsVisible="False" />


                        </StackLayout>
                    </ViewCell>
                </DataTemplate>
            </ListView.ItemTemplate>
        </ListView>

        <ImageButton Source="fedit.png" 
            BackgroundColor="Transparent"
            AbsoluteLayout.LayoutFlags="PositionProportional"  
            AbsoluteLayout.LayoutBounds=".95,.95,55,55" 
            Clicked="ImageButton_Clicked">
        </ImageButton>

    </AbsoluteLayout>
</ContentPage>

HomePage.cs：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net.Http;
using Newtonsoft.Json;
using Xamarin.Forms;
using Xamarin.Forms.Xaml;
using Last_MSPL.MenuItems;
using Last_MSPL.Views;
using System.Collections;

namespace Last_MSPL
{
    [XamlCompilation(XamlCompilationOptions.Compile)]
    public partial class HomePage : ContentPage
    {
        public IEnumerable ObjOrderList { get; private set; }


        public HomePage()
        {
            ((NavigationPage)Application.Current.MainPage).BarBackgroundColor = Color.Black;
            InitializeComponent();
            Get();
        }



        public async void Get()
        {
            HttpClient client = new HttpClient();
            try
            {
                var respone = await client.GetStringAsync("http://dummy.restapiexample.com/api/v1/employees");
                List<GetData> ObjOrderList = JsonConvert.DeserializeObject<List<GetData>>(respone);
                var totalCount = ObjOrderList.Count;
                Demolist.ItemsSource = ObjOrderList.GetRange(0, 40);
            }
            catch (Exception ex)
            {
                throw;
            }
        }


        public async void OnItemSelected(object sender, SelectedItemChangedEventArgs e)
        {
            HttpClient client = new HttpClient();
            if (Demolist.SelectedItem != null)
            {

                var respone = await client.GetStringAsync("http://dummy.restapiexample.com/api/v1/employees");
                List<GetData> ObjOrderList = JsonConvert.DeserializeObject<List<GetData>>(respone);
                var abc = (GetData)e.SelectedItem;

                GetData data = new GetData();
                data = ObjOrderList.ToList().Where(x => x.id == abc.id).FirstOrDefault();

                var detailPage = new DetailGetData(data);
                detailPage.BindingContext = e.SelectedItem as GetData;
                Demolist.SelectedItem = null;
                await Navigation.PushModalAsync(detailPage);

            }
        }

DetailGetData.cs：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net.Http;
using Newtonsoft.Json;
using Xamarin.Forms;
using Xamarin.Forms.Xaml;
using Last_MSPL.MenuItems;

namespace Last_MSPL.Views
{
    [XamlCompilation(XamlCompilationOptions.Compile)]
    public partial class DetailGetData : ContentPage
    {
        public DetailGetData(GetData _data)
        {
            InitializeComponent();
            BindingList(_data);

        }



        public void BindingList(GetData data)
        {
            empname.Text = data.employee_name;
            age.Text = data.employee_age;
            salary.Text = data.employee_salary;
        }


        public async void DeleteItem_Clicked(object sender, EventArgs e)
        {





            await Navigation.PopModalAsync();
        }
    }
}