我在SQL数据库中有三个表，我想在我的应用程序，tbFlights，tbRegions，Tbcountries中的treeview中显示。 FLight应该是一个孩子，并且在不同地区和国家之间堕落.................................... ..........................................
using Admin_Tool.Classes;
using Common.Classes;
using Common.Enums;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
namespace Admin_Tool.ViewModels
{
public class ViewFlightsViewModel : ViewModelBaseExtended
{
#region Properties
private Collection<SefFlight> _flightList = null;
public Collection<SefFlight> FlightList
{
get
{
return _flightList = _flightList ?? new Collection<SefFlight>();
}
}
private Collection<Region> _regionList = null;
public Collection<Region> RegionList
{
get
{
return _regionList = _regionList ?? new Collection<Region>();
}
}
#region Flight View
private bool _showLayout1 = true;
public bool ShowLayout1
{
get
{
return _showLayout1;
}
set
{
_showLayout1 = value;
}
}
//private static List<SefFlight> _sefFlightGroup = null;
//public static List<SefFlight> SefFlightGroup
//{
// get
// {
// return _sefFlightGroup = _sefFlightGroup ?? new List<SefFlight>();
// }
//}
//private static Dictionary<int, TreeViewItemViewModel> _itemGroupsList = null;
//public static Dictionary<int, TreeViewItemViewModel> ItemGroupsList
//{
// get
// {
// return _itemGroupsList = _itemGroupsList ?? new Dictionary<int, TreeViewItemViewModel>();
// }
//}
#endregion
#region
#endregion
#endregion
#region Constructors
public ViewFlightsViewModel(MainViewModel parent) : base (parent)
{
LoadSefFlight();
LoadRegions();
}
#endregion
#region Methods
private void LoadSefFlight()
{
try
{
FlightList.Clear();
var result = Common.Helpers.WebRequests.Invoke(ApiInventoryUrls.List_SefFlights, null, null);
if (result.IsSuccessful)
{
foreach (var flight in (List<SefFlight>)result.Result)
FlightList.Add(flight);
LoadRegions();
}
else
ShowError(result.ErrorMessage);
}
catch (Exception ex)
{
ShowError(ex.Message);
}
}
private void LoadRegions()
{
try
{
RegionList.Clear();
var result = Common.Helpers.WebRequests.Invoke(ApiInventoryUrls.List_RegionLists, null, null);
if (result.IsSuccessful)
{
foreach (var region in (List<Region>) result.Result)
RegionList.Add(region);
}
else
ShowError(result.ErrorMessage);
}
catch (Exception)
{
throw;
}
}
#endregion
#region Overrides
public override void Refresh()
{
throw new NotImplementedException();
}
#endregion
#region Relay Commands
#endregion
#region Commands
#endregion
}
}
以下是我显示数据的地方。
<UserControl x:Class="Admin_Tool.Views.ViewFlightsView"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:local="clr-namespace:Admin_Tool.Views"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="300">
<UserControl.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary>
<BooleanToVisibilityConverter x:Key="BooleanToVisibilityConverter" />
</ResourceDictionary>
<ResourceDictionary>
</ResourceDictionary>
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</UserControl.Resources>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="auto" />
<RowDefinition Height="auto"/>
<RowDefinition Height="*" />
</Grid.RowDefinitions>
<Ribbon Visibility="{Binding ShowRibbon}">
<Ribbon.ApplicationMenu>
<RibbonApplicationMenu Visibility="Collapsed" />
</Ribbon.ApplicationMenu>
<RibbonTab Header="Home">
<RibbonGroup Header="Actions">
<RibbonButton LargeImageSource="/Common;component/Resources/home.png"
Label="Home"
Command="{Binding CloseCommand}">
</RibbonButton>
</RibbonGroup>
<RibbonGroup Header="Tools">
<RibbonButton LargeImageSource="/Common;component/Resources/Edit.png"
Label="Edit"
Command="{Binding CloseCommand}">
</RibbonButton>
</RibbonGroup>
</RibbonTab>
</Ribbon>
<Grid Grid.Row="1">
<TextBlock Text="Flights"
FontSize="25"
HorizontalAlignment="Center" />
</Grid>
<Grid Grid.Row="2">
<Grid.ColumnDefinitions>
<ColumnDefinition Block.LineHeight="45" />
<ColumnDefinition/>
<ColumnDefinition/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<TextBlock Grid.Row="0"
Text="Scheduled Flights"
HorizontalAlignment="Center"/>
<Grid Grid.Row="1">
<GroupBox>
<TreeView ItemsSource="{Binding FlightList}">
<TreeView.ItemContainerStyle>
<!--
This Style binds a TreeViewItem to a PersonViewModel.
-->
<Style TargetType="{x:Type TreeViewItem}">
<Setter Property="IsExpanded" Value="{Binding IsExpanded, Mode=TwoWay}" />
<Setter Property="IsSelected" Value="{Binding IsSelected, Mode=TwoWay}" />
<Setter Property="FontWeight" Value="Normal" />
<Style.Triggers>
<Trigger Property="IsSelected" Value="True">
<Setter Property="FontWeight" Value="Bold" />
</Trigger>
</Style.Triggers>
</Style>
</TreeView.ItemContainerStyle>
<TreeView.ItemTemplate>
<HierarchicalDataTemplate ItemsSource="{Binding FlightList}">
<TextBlock Text="{Binding Description}" />
</HierarchicalDataTemplate>
</TreeView.ItemTemplate>
</TreeView>
</GroupBox>
</Grid>
<TextBlock Grid.Row="0"
Grid.Column="1"
Text="Scheduled Legs"
VerticalAlignment="Top"
HorizontalAlignment="Center"/>
<Grid Grid.Row="1"
Grid.Column="1">
<GroupBox>
<TreeView Name="trvList2">
<TreeView.ItemTemplate>
<HierarchicalDataTemplate ItemsSource="{Binding FilteredPrincipalList}">
<TextBlock Text="{Binding Title}" />
</HierarchicalDataTemplate>
</TreeView.ItemTemplate>
</TreeView>
</GroupBox>
</Grid>
<TextBlock Grid.Column="2"
Text=" View Scheduled Flights"
HorizontalAlignment="Center"
/>
<Grid Grid.Row="1"
Grid.Column="2">
<GroupBox></GroupBox>
</Grid>
</Grid>
</Grid>
</UserControl>
答案 0 :(得分：0)
FlightList必须是Observablecollection，并实施INotifyPropertyChanged并确保在您的列表完成后发生更改通知。
我会认为INotifyPropertyChanged在ViewModelBaseExtended课程中，我不会在这里接近它，只是使用它
这里是变化，所以它应该解决你的问题
private ObservableCollection<SefFlight> _flightList = null;
public ObservableCollection<SefFlight> FlightList
{
get
{
return _flightList ?? new ObservableCollection<SefFlight>();
}
set
{
_flightList = value;
OnPropertyChanged(nameof(FlightList)); // implement INotifyPropertyChanged
}
}
private ObservableCollection<Region> _regionList = null;
public ObservableCollection<Region> RegionList
{
get
{
return _regionList ?? new ObservableCollection<Region>();
}
set
{
_regionList = value;
OnPropertyChanged(nameof(RegionList)); // implement INotifyPropertyChanged
}
}
private void LoadSefFlight()
{
try
{
var flightList = new List<SefFlight>(); // <-- there was change here
var result = Common.Helpers.WebRequests.Invoke(ApiInventoryUrls.List_SefFlights, null, null);
if (result.IsSuccessful)
{
foreach (var flight in (List<SefFlight>)result.Result)
flightList.Add(flight); // <-- there was change here
FlightList = new ObservableCollection<SefFlight>(flightList); // <-- there was change here
LoadRegions();
}
else
ShowError(result.ErrorMessage);
}
catch (Exception ex)
{
ShowError(ex.Message);
}
}
private void LoadRegions()
{
try
{
var regionList = new List<Region>(); // <-- there was change here
var result = Common.Helpers.WebRequests.Invoke(ApiInventoryUrls.List_RegionLists, null, null);
if (result.IsSuccessful)
{
foreach (var region in (List<Region>) result.Result)
regionList.Add(region); // <-- there was change here
RegionList = new ObservableCollection<Region>(regionList); //<-- there was change here
}
else
ShowError(result.ErrorMessage);
}
catch (Exception)
{
throw;
}
}