我在使用MVVM的Windows 10 Universal App上开发了一个应用程序,但我遇到了很大问题 我将一个ObservableCollection项(在第二个窗口上创建)添加到MVVM然后,在MainPage的ListView上显示新项,但它不刷新!
2个窗口始终打开
http://i.stack.imgur.com/WSo6v.jpg
MVVMList.cs的代码
public class MVVMList : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
private ObservableCollection<THEFile> onglets_cache = new ObservableCollection<THEFile>();
public ObservableCollection<THEFile> onglets_list
{
get
{
return onglets_cache;
}
set
{
onglets_cache = value;
if (PropertyChanged != null)
PropertyChanged.Invoke(this,
new PropertyChangedEventArgs("onglets_list"));
}
}
public MVVMList()
{
onglets_list = new ObservableCollection<THEFile>();
Fonctions fonctions = new Fonctions();
fonctions.LoadOnglets(onglets_cache);
}
}
第二页的代码(始终打开) - CreateFile.xaml.cs
private void create_butt_Click(object sender, RoutedEventArgs e)
{
Fonctions fonc = new Fonctions(); MVVMList main = new MVVMList();
fonc.SetupNew(main.onglets_list, "test" + ".php", "");
}
//SetupNew on Fonctions.cs
public async void SetupNew(ObservableCollection<THEFile> list, string name, string content)
{
FolderPicker folderpick = new FolderPicker();
folderpick.ViewMode = PickerViewMode.List;
folderpick.FileTypeFilter.Add(".html"); folderpick.FileTypeFilter.Add(".htm"); folderpick.FileTypeFilter.Add(".HTML");
folderpick.FileTypeFilter.Add(".php"); folderpick.FileTypeFilter.Add(".PHP");
folderpick.FileTypeFilter.Add(".css"); folderpick.FileTypeFilter.Add(".CSS");
folderpick.FileTypeFilter.Add(".js"); folderpick.FileTypeFilter.Add(".JS");
StorageFolder storage_file = await folderpick.PickSingleFolderAsync();
if (storage_file != null)
{
MainPage vm = new MainPage();
list.Add(new THEFile { NameOfFile = name, PathOfFile = storage_file.Path + "\\" + name, CodeOfFile = content, already_opened = false, line = 0 });
string path = storage_file.Path + @"\" + name;
StorageFile file_create = await storage_file.CreateFileAsync(name, CreationCollisionOption.GenerateUniqueName);
Windows.Storage.AccessCache.StorageApplicationPermissions.FutureAccessList.Add(file_create);
SaveOnglets(list);
}
}
在MainPage.xaml上(始终打开)
...
<ListView x:Name="onglets" x:FieldModifier="public" ItemTemplate="{StaticResource Templa}" ItemsSource="{Binding onglets_list}" SelectionChanged="onglets_SelectionChanged" Margin="0,117,0,57" Visibility="Visible" ContainerContentChanging="onglets_ContainerContentChanging">
...
谢谢!
答案 0 :(得分:0)
在您的XAML中,尝试使用Collection View Source。
将其添加到xaml的顶部:
<Page.Resources>
<CollectionViewSource x:Name="MakesCollectionViewSource" IsSourceGrouped="True"/>
</Page.Resources>
设置ListView:
ItemsSource="{Binding Source={StaticResource MakesCollectionViewSource}}"
然后在您的代码中,当您有一个项目列表时,使用
分配它MakesCollectionViewSource.Source = /* Some List<GroupInfoList<object>> that is generated from onglets_list*/
我像这样创建我的列表,但它可能不相关,因为这是为了使我的所有对象名称都按字母顺序排列:
internal List<GroupInfoList<object>> GetGroupsByLetter()
{
var groups = new List<GroupInfoList<object>>();
var query = from item in MakeList
orderby ((Make)item).MakeName
group item by ((Make)item).MakeName[0] into g
select new { GroupName = g.Key, Items = g };
foreach (var g in query)
{
var info = new GroupInfoList<object>();
info.Key = g.GroupName;
foreach (var item in g.Items)
{
info.Add(item);
}
groups.Add(info);
}
return groups;
}
public class GroupInfoList<T> : List<object>
{
public object Key { get; set; }
public new IEnumerator<object> GetEnumerator()
{
return (System.Collections.Generic.IEnumerator<object>)base.GetEnumerator();
}
}
其中MakeList是我的可观察集合,Make是集合中的对象,MakeName是我想要按字母顺序排列的字符串
然后使用
进行呼叫MakesCollectionViewSource.Source = GetGroupsByLetter();
答案 1 :(得分:0)
如果我正确理解您的代码和要求,我认为问题的一部分是您&#34; new up&#34;每次单击“创建”按钮时,都会显示MVVMList和MainPage。
因此,如果不了解有关使用MVVM Light和IOC容器的建议,您可以通过使MVVMList类成为单例并让MainPage将其用于数据上下文来快速完成您尝试执行的操作。当您的其他窗口添加到MVVMList.onglets集合时,它将立即反映在您当前打开的MainPage中。如果您需要一些代码段,请告诉我。祝你好运!
[编辑如下]
午餐时间还剩下几分钟,所以这里有一个过于简化的例子。再次,没有进入MVVM是什么,不是。就个人而言,我会以不同的方式做到这一点,但这不在你问题的范围之内。完全披露 - 这是在WPF中,但同样的逻辑适用,我只是没有在我正在使用的PC上安装Windows 10。我还将集合简化为字符串类型。这不是为了复制/粘贴到您的代码中,因为它在您的示例中不起作用 - 但应该很容易转移。
MVVMList类:
public class MVVMList: INotifyPropertyChanged
{
//Singleton section
private static MVVMList instance;
private MVVMList() { }
public static MVVMList Instance
{
get
{
if (instance == null)
{
instance = new MVVMList();
}
return instance;
}
}
//end singleton section
private ObservableCollection<string> _onglets = new ObservableCollection<string>();
public ObservableCollection<string> Onglets
{
get { return _onglets; }
set
{
if (_onglets != value)
{
_onglets = value;
if (PropertyChanged != null)
PropertyChanged.Invoke(this,
new PropertyChangedEventArgs("onglets_list"));
}
}
}
//INotify implementation
public event PropertyChangedEventHandler PropertyChanged;
}
的MainPage:
<ListView x:Name="onglets" x:FieldModifier="public" ItemsSource="{Binding Onglets}" />
MainPage.cs:
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
this.DataContext = MVVMList.Instance;
Loaded += MainWindow_Loaded;
}
void MainWindow_Loaded(object sender, RoutedEventArgs e)
{
var x = new CreateWindow();
x.Show();
}
}
CreateWindow.cs:
private void CreateButton_Click(object sender, RoutedEventArgs e)
{
if (!string.IsNullOrEmpty(StringTextBox.Text))
{
MVVMList.Instance.Onglets.Add(StringTextBox.Text);
}
}