WPF綁定，後臺數據已更新，但前臺數據未刷新

1.後臺模型類（通常定義主窗口類MainWindow的後臺模型類MainWindowModel）中增長命令空間引用using System.ComponentModel;

2.修改類MainWindowModel繼承INotifyPropertyChanged，定義事件PropertyChanged;

3.修改被前臺綁定的屬性set值。

具體參見以下代碼：

public class MainWindowModel:INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;
        #region MES狀態
        private string _MESState = "離線";
        /// <summary>
        ///
        /// </summary>
        public string MESState
        {
            get { return _MESState; }
            set
            {
                if (_MESState != value)
                     _MESState= value;
                PropertyChanged?.Invoke(this, new PropertyChangedEventArgs("MESState"));
            }
        }
        #endregion

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