Silverlight Binding之ConverterParameter
验证内容:
Binding对象的ConverterParameter参数值是否有自动的时间通知,
即该变量来与一个实现INotifyPropertyChanged接口且在改变时发出改变通知的属性,当该属性改变时,
Binding对象的ConverterParameter是否会发生变化。
实现步骤:
第一步创建一个简单的对象:
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
第二步创建一个集成自IValueConverter接口的对象
View Code
第三步创建Binding对象,比用Timer定期改变其属性。
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
public partial class MainPage : UserControl
{
System.Windows.Threading.DispatcherTimer timer = new System.Windows.Threading.DispatcherTimer();
Person person = new Person();
Random random = new Random();
public MainPage()
{
InitializeComponent();
person.Name = "-1";
AlarmColorConvert convert = new AlarmColorConvert();
Binding binding = new Binding();
binding.Path = new PropertyPath("Age", new object[0]);
binding.Source = person;
binding.Converter = convert;
binding.ConverterParameter = person.Name;
LayoutRoot.SetBinding(Grid.BackgroundProperty, binding);
timer.Interval = TimeSpan.FromSeconds(5);
timer.Tick += new EventHandler(timer_Tick);
timer.Start();
}
void timer_Tick(object sender, EventArgs e)
{
person.Age = random.Next(0, 100);
person.Name = person.Age.ToString();
}
{
System.Windows.Threading.DispatcherTimer timer = new System.Windows.Threading.DispatcherTimer();
Person person = new Person();
Random random = new Random();
public MainPage()
{
InitializeComponent();
person.Name = "-1";
AlarmColorConvert convert = new AlarmColorConvert();
Binding binding = new Binding();
binding.Path = new PropertyPath("Age", new object[0]);
binding.Source = person;
binding.Converter = convert;
binding.ConverterParameter = person.Name;
LayoutRoot.SetBinding(Grid.BackgroundProperty, binding);
timer.Interval = TimeSpan.FromSeconds(5);
timer.Tick += new EventHandler(timer_Tick);
timer.Start();
}
void timer_Tick(object sender, EventArgs e)
{
person.Age = random.Next(0, 100);
person.Name = person.Age.ToString();
}
实验结论:无论上面person对象的Age和Name如何改变AlarmColorConvert接口的parameter值始终为-1.
即:ConverterParameter值得改变时是不会自动传递的。