024 . WPF MVVM类封装优化

cjp5602026-09-22 8:31

随着我们mvvm绑定的功能越来越复杂,前面封装的简易mvvm类已经无法满足我们的需求,本节将对mvvm类进行升级,增加计算属性通知

优化后的mvvm通知类

cs 复制代码

    public class ObservableObject : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;

        protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }

        protected bool SetProperty<T>(ref T storage, T value, [CallerMemberName] string propertyName = null)
        {
            if (Equals(storage, value))
            {
                return false;
            }

            storage = value;
            OnPropertyChanged(propertyName);
            return true;
        }
    }

写一个计算类

cs 复制代码

public class Rest_NGW
 {
     public double rest_key1(int i)
     {
         return 0.5;
     }
 }

在数据类中,list属性改变时,调用计算类来刷新test属性的值

cs 复制代码

  public class NGW_Modle : ObservableObject
 {
     Rest_NGW rest_NGW = new Rest_NGW();//计算类


     private int i_list;

		public int I_list
		{
get { return i_list; }
         set
         {
             if (SetProperty(ref i_list, value))
             {
                Test = rest_NGW.rest_key1(i_list);//更新Test属性的值
             }
         }
     }

     private double test;

     public double Test
     {
         get { return test; }
         set
         {
             if (SetProperty(ref test, value))
             {

             }
         }
     }




 }