So I am currently working on a listview where it's going to populate with items. In this case usernames.
I am deserializing json to create objects, and I am going to take the objects and the NAME property and populate the listview with the names. I've tried making it to where I can remove selected items
but no matter what I do and how I do it, it always ends up throwing an error. Apparently this should be really easy so I need help understanding how to do this in a propper way.
At the current state (see the code below) there are no errors because the code is so slim. It's not even populating the listview at this point. I think it's the databinding that got messed up.
This is what my MainWindow.xaml contains.
<Grid>
<ListView Name="theListview" HorizontalAlignment="Left" Height="236" Margin="10,10,0,0" VerticalAlignment="Top" Width="497">
<ListView.View>
<GridView>
<GridViewColumn Header="Name" DisplayMemberBinding="{Binding Name}"/>
</GridView>
</ListView.View>
</ListView>
<Button Name="btnAdd" Click="btnAdd_Click" Content="Add" HorizontalAlignment="Left" Margin="61,276,0,0" VerticalAlignment="Top" Width="75"/>
<Button Name="btnRemove" Click="btnRemove_Click" Content="Remove" HorizontalAlignment="Left" Margin="389,276,0,0" VerticalAlignment="Top" Width="75"/>
</Grid>
And this is my CS
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.
}
}
}
JSON
[
{
"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."
}
]
Something like this should work (you need to remove them from the ObservableCollection
):
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);
}
}
You need to set the ItemsSource
of the ListView
to the ObservableCollection
somewhere.
You could then cast the SelectedItem
of the ListView
to a Users
and remove it from the source collection:
public partial class MainWindow : Window
{
string userdata;
private ObservableCollection<Users> theUsers = new ObservableCollection<Users>();
public MainWindow()
{
InitializeComponent();
theListview.ItemsSource = theListview;
}
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)
{
Users selectedUser = theListview.SelectedItem as Users;
if (selectedUser != null)
theUsers.Remove(selectedUser);
}
}
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