從物件函式更新背景關系

在我的視窗中，我需要為FileWatcher機器上的串列設定 , 串列。為此，我設定了一個新課程MachineWatcher：

public class MachineWatcher : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;

        public void NotifyPropertyChanged(string propName)
        {
            this.PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propName));
        }
        private bool NotifyPropertyChanged<T>(ref T variable, T valeur, [CallerMemberName] string nomPropriete = null)
        {
            if (object.Equals(variable, valeur)) return false;

            variable = valeur;
            NotifyPropertyChanged(nomPropriete);
            return true;
        }
        private Machine machine { get; set; }
        public Machine Machine { get { return this.machine; } set { this.machine = value; } }
        private string typeWatcher { get; set; } = "";
        public string TypeWatcher { get { return this.typeWatcher; } set { this.typeWatcher = value; } }
        FileSystemWatcher watcher { get; set; }
        public FileSystemWatcher Watcher { get { return this.watcher; } set { this.watcher = value; } }
        private string lastFileName { get; set; } = "";
        private DateTime lastEvent { get; set; } = DateTime.MinValue;
        private ObservableCollection<string> listErrors { get; set; } = new ObservableCollection<string>();
        public ObservableCollection<string> ListErrors { get { return this.listErrors; } set { this.listErrors = value; NotifyPropertyChanged("ListErrors"); } }
        public MachineWatcher()
        {

        }
        public MachineWatcher(string type,string directoryStock,string fileFilter)
        {
            this.typeWatcher = type;
            this.watcher = new FileSystemWatcher
            {
                Path = Path.GetDirectoryName(directoryStock),
                Filter = fileFilter
            };
            if (this.typeWatcher=="stock")
            {
                this.watcher.Created  = new FileSystemEventHandler(OnStockFileCreated);
            }
            else if(this.typeWatcher=="machine")
            {
                //this.watcher.NotifyFilter = NotifyFilters.Size | NotifyFilters.LastWrite | NotifyFilters.LastAccess | NotifyFilters.CreationTime;
                this.watcher.Changed  = OnFeedBackNesterCreated;
                this.watcher.Created  = OnFeedBackNesterCreated;
                this.watcher.Renamed  = OnFeedBackNesterCreated;
                this.watcher.Deleted  = OnFeedBackNesterCreated;
            }
            this.watcher.EnableRaisingEvents = true;
        }
        private void OnFeedBackNesterCreated(object source, FileSystemEventArgs e)
        {
            try
            {
                //try to read file
            }
            catch
            {
                string errorText = "Error reading file "   e.FullPath;
                this.ListErrors.Add(errorText);
            }
        }
        
    }

然后在我的 mainWindow 中我定義了一個List<MachineWatcher>

然后我這樣創建：

MachineWatcher machineWatcher = new MachineWatcher("stock", directoryStock, "*.csv");
this.listMachineWatchers.Add(machineWatcher);

我想要的是，當我MachineWatcher遇到錯誤時，進入catch，更新 a Observable<string> ListErrors，所有機器的所有錯誤都寫在哪里。

有沒有辦法從物件 MachineWatcher 呼叫 MainWindows 中的函式？

uj5u.com熱心網友回復：

有沒有辦法從物件 MachineWatcher 呼叫 MainWindows 中的函式？

是的，假設您有對MainWindowin的參考MachineWatcher。

例如，您可以在實體化它時注入MachineWatcher帶有參考的類MainWindow：

private readonly MainWindow mainWindow;

public MachineWatcher(string type,string directoryStock,string fileFilter, MainWindow mainWindow)
{
    this.typeWatcher = type;
    this.watcher ...
    this.mainWindow =  mainWindow;
}

主視窗：

MachineWatcher machineWatcher = new MachineWatcher("stock", directoryStock, "*.csv", this);

mainWindow然后你可以直接從MachineWatcher類中呼叫任何成員。

標籤：C＃wpf

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