/// <summary>
/// Setup a reoccurring data client which is bound to a source property of an object.
/// The Start method must be called to begin the request.
/// </summary>
/// <param name="source"></param>
public Request(object context, string propertyName)
{
if (context == null)
{
throw new ArgumentNullException("Context must not be null.");
}
if (!(context is INotifyPropertyChanged))
{
throw new ArgumentException("Context does not implement INotifyPropertyChanged.");
}
this.boundPropertyName = propertyName;
this.context = context;
this.source = GetSourceFromContext(context, propertyName);
(context as INotifyPropertyChanged).PropertyChanged += context_PropertyChanged;
if (source != null && source.Interval != TimeSpan.MaxValue)
{
this.timer = new DispatcherTimer();
timer.Tick += timer_Tick;
timer.Interval = source.Interval;
}
}
/// <summary>
/// Setup a reoccurring data client.
/// The Start method must be called to begin the request.
/// </summary>
/// <param name="source"></param>
public Request(Source source)
{
if (source == null)
throw new ArgumentNullException("Source");
this.source = source;
if (source.Interval != TimeSpan.MaxValue)
{
this.timer = new DispatcherTimer();
timer.Tick += timer_Tick;
timer.Interval = source.Interval;
}
}
private Source GetSourceFromContext(object context, string propertyName)
{
Source source = null;
Type type = context.GetType();
PropertyInfo property = type.GetProperty(this.boundPropertyName);
source = property.GetValue(context, null) as Source;
return source;
}
private void context_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
{
if (this.boundPropertyName != string.Empty && e.PropertyName == this.boundPropertyName)
{
timer.Stop();
this.source = GetSourceFromContext(this.context, this.boundPropertyName);
if (this.source != null)
{
timer.Interval = source.Interval;
}
timer.Start();
}
}
