dynamicobject在wpf中的应用

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1、Dynamicobject在WPF中的应用在.NetFramework4引入了dynamic关键字。它是在运行时才确定对象的类型。在运行的时候确定类型的好处是，少了一些装箱，拆箱操作。WPF中也有动态对象概念，那就是Dynamicobject,它继承于IDynamicMetaObjectProvider这个接口。Dynamicobject这个类能实现动态的给屈性赋值和取值。它提供给我们两个TrySetMember和TryGetMember方法。我们只要重写这两个方法，来设置我们需要的属性。我们白定义一个DynamicBindingProx

2、y泛型类：publicclassDynamicBindingProxyvT>:DynamicObject,INotifyPropertyChanged{privatestaticreadonlyDictionary>properties=newDictionary

3、Name;publicDynamicBindingProxy仃instance){_instance=instance;vartype=typeof(T);_typeName=type.FullName;if(Iproperties.ContainsKey(_typeName))SetProperties(type,_typeName);}privatestaticvoidSetPropertiesfTypetype,stringtypeName){varprops=type.GetPropertiesfBindingFlags.Publ

4、ic

5、BindingFlags」nstanee);vardiet=props.ToDictionary(prop=>prop.Name);properties.Add(typeName,diet);}publicoverrideboolTryGetMember(GetMemberBinderbinder,outobjectresult){if(properties[_typeName].ContainsKey(binder.Name)){result=properties[_typeName][binder.Name].GetValue(

6、_instanee,null);returntrue;}result=null;returnfalse;}publicoverrideboolTrySetMember(SetMemberBinderbinder;objectvalue)if(properties[_typeName].ContainsKey(bindenName))properties[_typeName][binder.Name].SetValue(_instanc巳value,null);讦(PropertyChanged!=null)PropertyChangedf

7、this,newPropertyChangedEventArgs(binder.Name));}returntrue;}returnfalse;}publiceventPropertyChangedEventHandlerPropertyChanged;}定义一个我们需要的实体类：publicclassPerson{publicstringName{get;set;}publicintAge{get;set;}publicDateTimeBirthday{get;set;}}实现动态属性变更：publicpartialclassMainW

8、indow:Window{privatePerson_person;privateDynamicBindingProxyvPerson>_bindingProxy;publicMainWindow(){InitializeComponent();_person二newPerson(){Name=,,xiaoli,,/Age=23,Birthday=DateTime.Now};_bindingProxy=newDynamicBindingProxy(_person);〃动态绑定实体属性DataContext=_binding

9、Proxy;}privatevoidUpdateName(objectsender,RoutedEventArgse){((dynamic)_bindingProxy).Name=newTex