与ObservableCollection的组合框绑定未更新

如何解决与ObservableCollection的组合框绑定未更新

当我删除一个项目但我无法使它工作时，我正在尝试使组合框更新。
我将ObservableCollection表单填充为XML，然后将其绑定到组合框，这部分工作正常。 当我单击删除按钮时，我正在从xml中删除，而且我不知道如何触发从可观察的集合中删除。

到目前为止，这是我的尝试：

ChargementScenario.Xaml

<ComboBox x:Name="cbScenario" ItemsSource="{Binding Scenarios,Mode=TwoWay}" displayMemberPath="name" Foreground="Black"
                    HorizontalAlignment="Center" VerticalAlignment="Center" Width="250" Height="40" FontFamily="/GAF-WPF;component/Resources/Font/#Barlow" 
                          Grid.Row="0" Grid.Column="1" SelectionChanged="CbScenario_SelectionChanged">
                </ComboBox>

ChargementScenario.xaml.cs

public partial class pageChargementScenario : Page
    {
        ObservableCollection<Scenario> listScenario = new ObservableCollection<Scenario>();
        public pageChargementScenario()
        {
            InitializeComponent();

            Loaded += pageChargementScenario_Loaded;
        }

        private void pageChargementScenario_Loaded(object sender,RoutedEventArgs e)
        {
            //VERIFICATION DE LA PRESENCE DE SCENARIO 
            ScenarioVM scenarioVM = new ScenarioVM();
            scenarioVM.Scenarios = Scenario.loadListScenario();            

            if (scenarioVM.Scenarios.Count != 0)
            {
                DataContext = scenarioVM;
            }
            else
            {
                cbScenario.IsEnabled = false;
                btnLoadScenario.Visibility = Visibility.Hidden;
                btnDeleteScenario.Visibility = Visibility.Hidden;
            }
        }

private void CbScenario_SelectionChanged(object sender,SelectionChangedEventArgs e)
        {
            var scenario = (Scenario)e.AddedItems[0];
            txtBoxInfoComplementaire.Text = scenario.infoComplementaire;
        }

  private void BtnDeleteScenario_Click(object sender,RoutedEventArgs e)
        {
            DialogResult result = System.Windows.Forms.MessageBox.Show($"Voulez-vous effacer le scenario {cbScenario.Text}","SUPPRESSION SCENARIO",MessageBoxButtons.YesNo);

            if (result == DialogResult.Yes)
            {
                Scenario.deleteScenario(cbScenario.Text);
            }
        }
}

Scenario.cs

 public class Scenario
    {
        public string name { get; set; }
        public string codeClient { get; set; }
        public string codeAppli { get; set; }
        public string infoComplementaire { get; set; }
        public string modeTelecom { get; set; }
        public string extension { get; set; }
        public string destination { get; set; }
        public string idf { get; set; }
        public string modeEnvoieFtp { get; set; }
        public string typeErreur { get; set; }
        public string partenaire { get; set; }
        public int nombreFichier { get; set; }
        public int intervalleFichier { get; set; }
        public int nombreErreur { get; set; }

        public Scenario()
        {
        }

        public Scenario(string Name,string CodeClient,string CodeAppli,string InfoComplementaire,string ModeTelecom,string Idf,string Partenaire,string Extension,string Destination,int NombreFicher,string TypeErreur,int NombreErreur,int IntervalleFichier,string ModeEnvoieFtp)
        {
            name = Name;
            codeClient = CodeClient;
            codeAppli = CodeAppli;
            infoComplementaire = InfoComplementaire;
            modeTelecom = ModeTelecom;
            extension = Extension;
            destination = Destination;
            idf = Idf;
            modeEnvoieFtp = ModeEnvoieFtp;
            typeErreur = TypeErreur;
            partenaire = Partenaire;
            nombreFichier = NombreFicher;
            intervalleFichier = IntervalleFichier;
            nombreErreur = NombreErreur;
        }

        //CHARGEMENT DE LA LISTE DES SCENARIOS
        public static ObservableCollection<Scenario> loadListScenario()
        {
            XDocument xmlScenario = new XDocument();
            if (File.Exists(ConfigurationManager.AppSettings["xmlScenario"]))
            {
                xmlScenario = XDocument.Load(ConfigurationManager.AppSettings["xmlScenario"]);

                //CHARGEMENT DES SCENARIOS
                IEnumerable<Scenario> listeScenario = from scenario in xmlScenario.Descendants("scenario")
                                                      select new Scenario()
                                                      {
                                                          name = (string)scenario.Attribute("nom"),codeClient = (string)scenario.Element("codeClient"),codeAppli = (string)scenario.Element("codeApplication"),infoComplementaire = (string)scenario.Element("informationComplementaire"),modeTelecom = (string)scenario.Element("modeTelecom"),extension = (string)scenario.Element("extension"),destination = (string)scenario.Element("destination"),idf = (string)scenario.Element("idf"),partenaire = (string)scenario.Element("partenaire"),nombreFichier = (int)scenario.Element("nombreFichier"),typeErreur = (string)scenario.Element("typeErreur"),nombreErreur = (int)scenario.Element("nombreErreur"),intervalleFichier = (int)scenario.Element("intervalleFichier"),modeEnvoieFtp = (string)scenario.Element("modeEnvoieFtp")
                                                      };

                ObservableCollection<Scenario> collectionScenario = new ObservableCollection<Scenario>(listeScenario);

                return collectionScenario;
            }
            else
            {
                return null;
            }
        }

        public static bool checkDoublon(string scenarioName)
        {
            bool exist = false;

            XDocument xmlScenario = new XDocument();
            xmlScenario = XDocument.Load(ConfigurationManager.AppSettings["xmlScenario"]);

            if (File.Exists(ConfigurationManager.AppSettings["xmlScenario"]))
            {
                exist = xmlScenario.Elements("listScenario").Elements("scenario")
                           .Any(x => x.Attribute("nom").Value == scenarioName);
            }
            return exist;
        }

        public static void saveScenario(Scenario scenario)
        {
            XDocument xmlScenario = new XDocument();

            //CREATION DU XML SI CELUI CI N'EXISTE PAS
            if (!File.Exists(ConfigurationManager.AppSettings["xmlScenario"]))
            {
                xmlScenario = new XDocument(new XElement("listScenario"));
                xmlScenario.Save(ConfigurationManager.AppSettings["xmlScenario"]);
            }

            //CHECK SI LE SCENARIO EXISTE DEJA
            bool scenarioExist = checkDoublon(scenario.name);

            if (scenarioExist)
            {
                MessageBox.Show("UN SCENARIO DU MEME NOM EXISTE DEJA","ERREUR NOM SCENARIO");
                return;
            }

            //AJOUT DU NOUVEAU SCENARIO
            xmlScenario = XDocument.Load(ConfigurationManager.AppSettings["xmlScenario"]);

            XElement newScenario = new XElement("scenario",new XAttribute("nom",scenario.name),new XElement("codeClient",scenario.codeClient),new XElement("codeApplication",scenario.codeAppli),new XElement("informationComplementaire",scenario.infoComplementaire),new XElement("modeTelecom",scenario.modeTelecom),new XElement("idf",scenario.idf),new XElement("partenaire",scenario.partenaire),new XElement("extension",scenario.extension),new XElement("destination",scenario.destination),new XElement("nombreFichier",scenario.nombreFichier),new XElement("typeErreur",scenario.typeErreur),new XElement("nombreErreur",scenario.nombreErreur),new XElement("intervalleFichier",scenario.intervalleFichier),new XElement("modeEnvoieFtp",scenario.modeEnvoieFtp)
            );

            xmlScenario.Root.AddFirst(newScenario);
            xmlScenario.Save(ConfigurationManager.AppSettings["xmlScenario"]);

        }

        public static void deleteScenario(string scenarioName)
        {
            XDocument xmlScenario = new XDocument();
            xmlScenario = XDocument.Load(ConfigurationManager.AppSettings["xmlScenario"]);

            if (File.Exists(ConfigurationManager.AppSettings["xmlScenario"]))
            {
                var elementToRemove = xmlScenario.Elements("listScenario").Elements("scenario")
                           .Where(x => x.Attribute("nom").Value == scenarioName);
                elementToRemove.Remove();

                xmlScenario.Save(ConfigurationManager.AppSettings["xmlScenario"]);
            }
        }


    }

ScenarioVM.cs

    public class ScenarioVM : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;
        protected void OnPropertyChanged(string name)
        {
            PropertyChanged?.Invoke(this,new PropertyChangedEventArgs(name));
        }
        private ObservableCollection<Scenario> _Scenarios { get; set; }
        public ObservableCollection<Scenario> Scenarios
        {
            get { return _Scenarios; }
            set {
                _Scenarios = value;
                OnPropertyChanged("Scenario");
            }
        }
}

我正在尝试使用MVVC，但是我对此很陌生，所以...我不知道我缺少什么...

提前谢谢：）

解决方法

为了从源集合中删除选定的元素，您需要访问视图模型，方法是将DataContext属性强制转换为视图模型类型，或者将引用保留为类成员（例如，一个私有字段private ScenarioVM scenarioVM;）

if (result == DialogResult.Yes)
{
    var selectedScenario = cbScenario.SelectedItem as Scenario;

    if (selectedScenario != null)
    {
        var scenarioVM = (ScenarioVM)DataContext;
        scenarioVM.Scenarios.Remove(selectedScenario);

        Scenario.deleteScenario(selectedScenario.name);
    }
}

---

请注意，您的Scenario类应遵循广泛接受的命名约定，并将PascalCase用于属性名称，将camelCase用于局部变量和方法参数名称：

public class Scenario
{
    public string Name { get; set; }
    ...
    public Scenario(string name,...)
    {
        Name = name;
        ...
    }
}