如何在通用列表wpf C＃中获取带有用户名的用户名？

Question

I programing an WPF client application. I have a rest api, the WPF client is communicating with this. I made a combobox in wpf, the data binding is ok.

XAML markup:

<ComboBox Name="usernameBox" HorizontalAlignment="Left" 
          Margin="127,33,0,0" VerticalAlignment="Top" Width="152" Height="24" 
          ItemsSource="{Binding UserList}" DisplayMemberPath="Username"/>

This is working fine. But I have one generic list Userlist , I am binding this for the combobox. I want that for the username is the combobox I can get a variable with userid.

Model\\Users class:

namespace Desktop.Model
{
    public class Users
    {
        public int UserId { get; set; }
        public string Username { get; set; }
        public string Password { get; set; }
        public string Fullname { get; set; }
        public int Authority { get; set; }
    }
}

ViewModel/UserViewModel class:

using GalaSoft.MvvmLight;
using Desktop.Model;
using System;
using System.Collections.Generic;
using System.Net;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Net.Http.Formatting;
using Newtonsoft.Json;

namespace Desktop.ViewModel
{
    public class UserViewModel : ViewModelBase
    {
        public List<Users> UserList { get; set; }

        public UserViewModel()
        {
            UserList = new List<Users>();
            string url = "http://localhost:1234/api/users";
            var json = new WebClient().DownloadString(url);
            UserList = JsonConvert.DeserializeObject<List<Users>>(json);
        }
    }
}

Get api/users json:

[
  {
    "UserID": 1,
    "Username": "admin",
    "Password": "password",
    "Fullname": "teszt",
    "Authority": 1
  }
]

Sorry for my bad English. Please help me! Thank you.

Answer 1

I managed to solve.

XAML markup:

<ComboBox x:Name="usernameBox" HorizontalAlignment="Left" Margin="127,33,0,0" VerticalAlignment="Top" Width="152" ItemsSource="{Binding UserList}" SelectedValuePath="UserId" DisplayMemberPath="Username"/>

Codebehind:

var id = usernameBox.SelectedValue;

It's working fine!

Answer 2

Using MVVM like you are you can add to your XAML:

SelectedItem="{Binding SelectedUser}"

in your ViewModel:

private Users _user;
public Users SelectedUser
{
    get
    {
        return _user;
    }
    set
    {
        if (_user == value)
            return;
        _user = value;
        OnPropertyChanged(nameof(SelectedUser));
    }
}

Done, use the property SelectedUser to get your selected " Users " in your ComboBox