问题描述
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("@R_11_4045@ionComplementaire"),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("@R_11_4045@ionComplementaire",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;
...
}
}