Visual Studio creates a BindableBase class in the Common folder of your projects. (Don’t confuse this class with the BindingBase class from which Binding derives.)

BindableBase 是像下面这样定义的

public abstract class BindableBase : INotifyPropertyChanged

{ public event PropertyChangedEventHandler PropertyChanged;

protected bool SetProperty<T>(ref T storage, T value, [CallerMemberName] String propertyName = null)

{ if (object.Equals(storage, value))

return false; storage = value; this.OnPropertyChanged(propertyName); return true; }

protected void OnPropertyChanged([CallerMemberName] string propertyName = null)

{ var eventHandler = this.PropertyChanged;

if (eventHandler != null)

{ eventHandler(this, new PropertyChangedEventArgs(propertyName)); } } }

BindableBase 类的使用方法：

using Windows.UI; using ColorScrollWithDataContext.Common; namespace ColorScrollWithDataContext { public class RgbViewModel : BindableBase { double red, green, blue; Color color = Color.FromArgb(255, 0, 0, 0); public double Red{ set { if (SetProperty
     
      (ref red, value)) Calculate(); } get { return red; } } public double Green { set { if (SetProperty
      
       (ref green, value)) Calculate(); } get { return green; } } public double Blue { set { if (SetProperty
       
        (ref blue, value)) Calculate(); } get { return blue; } } public Color Color { set { if (SetProperty
        
         (ref color, value)) { this.Red = value.R; this.Green = value.G; this.Blue = value.B; } } get { return color; } } void Calculate() { this.Color = Color.FromArgb(255, (byte)this.Red, (byte)this.Green, (byte)this.Blue); } } }
        
       
      
     

使用方法 ，定义字段 double red，在 Red里面 属性set 调用

SetProperty
    
     (refred, value)，就可以了
    

SetProperty
    
     (ref red, value)返回true 表示red 改变，返回false 没有改变 。NET 4.5 。C# 5.0 这样用