Clingingboy

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Get Ready For WPF && SilverLight

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wpf学习笔记-更新数据源

此示例基于 wpf学习笔记-指定数据源

1.让对象实现INotifyPropertyChanged接口,以便属性更改发出通知

public class Person : INotifyPropertyChanged

{

public Person() { }

public Person(string name, int age)

{

this.name = name;

this.age = age;

}

string name;

public string Name

{

get { return this.name; }

set

{

this.name = value;

OnPropertyChanged("Name");

}

int age;

public int Age

{

get { return this.age; }

set

{

this.age = value;

OnPropertyChanged("Age");

}

public event PropertyChangedEventHandler PropertyChanged;

protected void OnPropertyChanged(string propName)

{

if (this.PropertyChanged != null)

{

PropertyChanged(this, new PropertyChangedEventArgs(propName));

}

2.xaml(略去布局)

<TextBox Text="{Binding Age}"

这里又出现了新的绑定语法,{Binding Path=Age}等价{Binding Age}

3.目标:
当更改目标属性的时候,更新数据源(更新以后则绑定的对象也发生变化,如更改TextBox的Text则Label的Content也发生变化)

4.设置更新数据源执行时间
通过设置Binding对象的UpdateSourceTrigger 来确定执行时间.