Question

所以我目前正在制作一个列表视图，用于填充项目。在这种情况下，用户名我正在反序列化json以创建对象，我将获取对象和NAME属性并使用名称填充listview。我已尝试将其移至我可以删除所选项目的位置 但无论我做什么以及如何做，它总是会抛出一个错误。显然这应该是非常简单的，所以我需要帮助了解如何以适当的方式做到这一点。

在当前状态下（参见下面的代码），没有错误，因为代码非常小。此时它甚至没有填充列表视图。我认为数据绑定搞砸了。

这是我的MainWindow.xaml包含的内容。

using Newtonsoft.Json;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.IO;
using System.Windows;

namespace lvProject
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        string userdata;
        private ObservableCollection<Users> theUsers = new ObservableCollection<Users>();

        public MainWindow()
        {
            InitializeComponent();
        }

        private void PopulateListView()
        {
            using (StreamReader sr = new StreamReader("ops.json"))
            {
                userdata = sr.ReadToEnd();
                List<Users> accounts = JsonConvert.DeserializeObject<List<Users>>(userdata);
                foreach (var account in accounts)
                {
                    theUsers.Add(new Users { Name = account.Name });
                }
            }
        }

        private void btnAdd_Click(object sender, RoutedEventArgs e)
        {
            //I got the code done for this part, I wont include it because it will make this too long.
        }

        private void btnRemove_Click(object sender, RoutedEventArgs e)
        {
            //I want to remove the SELECTED item from the listview here.
        }
    }
}

这是我的CS

[
  {
    "uuid": "a7c1987f-022c-4310-bd32-21614e7e37b8",
    "name": "Stefan",
    "created": "2017-11-09 21:54:40 +0100",
    "source": "Server",
    "expires": "forever",
    "reason": "Banned by an operator."
  },
  {
    "uuid": "98e99e7a-df48-4b8b-adc9-e65c32410247",
    "name": "Demauen",
    "created": "2017-11-09 20:44:35 +0100",
    "source": "Server",
    "expires": "forever",
    "reason": "Banned by an operator."
  },
  {
    "uuid": "d229d707-27ae-472b-b2df-205713a7c0e0",
    "name": "Kakor",
    "created": "2017-11-09 21:56:02 +0100",
    "source": "Server",
    "expires": "forever",
    "reason": "Banned by an operator."
  },
  {
    "uuid": "af4e2469-0988-4c42-97df-3301a167b658",
    "name": "STEFANOS",
    "created": "2017-11-09 22:26:14 +0100",
    "source": "Server",
    "expires": "forever",
    "reason": "Banned by an operator."
  },
  {
    "uuid": "12e343aa-2c18-45ad-a485-b37838eecd3d",
    "name": "charlies",
    "created": "2017-11-09 22:26:22 +0100",
    "source": "Server",
    "expires": "forever",
    "reason": "Banned by an operator."
  },
  {
    "uuid": "b87e1cbc-c67c-4026-a359-8652ad9de8b4",
    "name": "iVarga",
    "created": "2017-11-09 20:44:38 +0100",
    "source": "Server",
    "expires": "forever",
    "reason": "Banned by an operator."
  },
  {
    "uuid": "eb04608e-cadc-4970-aa57-c60c43fce352",
    "name": "steffe",
    "created": "2017-11-09 22:09:14 +0100",
    "source": "Server",
    "expires": "forever",
    "reason": "Banned by an operator."
  },
  {
    "uuid": "5f95fb35-a2aa-42ac-a99b-e88a013f51b9",
    "name": "Alan",
    "created": "2017-11-09 21:38:20 +0100",
    "source": "Server",
    "expires": "forever",
    "reason": "Banned by an operator."
  }
]

JSON

{{1}}

Answer 1

这样的事情应该有用（你需要从ObservableCollection中删除它们）：

private void btnRemove_Click(object sender, RoutedEventArgs e)
{
    List<Users> usersToRemove = new List<Users>();

    foreach (Users item in theListview.SelectedItems)
    {
        usersToRemove.Add(item);
    }

    foreach (Users userToRemove in usersToRemove)
    {
        theUsers.Remove(userToRemove);
    }
}

Answer 2

您需要将ItemsSource的{{1}}设置为ListView某处。

然后，您可以将ObservableCollection的{{1}}转换为SelectedItem并将其从源集合中删除：

ListView

如何在列表视图中正确添加和删除SELECTED项目

2 个答案: