ExtendedProperties.DoesPropertyExist - метод
Обновлен: Ноябрь 2007
Indicates whether a specified ExtendedProperty object exists in the ExtendedProperties collection.
Пространство имен: Microsoft.Ink
Сборка: Microsoft.Ink (в Microsoft.Ink.dll)
Синтаксис
'Декларация
Public Function DoesPropertyExist ( _
id As Guid _
) As Boolean
'Применение
Dim instance As ExtendedProperties
Dim id As Guid
Dim returnValue As Boolean
returnValue = instance.DoesPropertyExist(id)
public bool DoesPropertyExist(
Guid id
)
public:
bool DoesPropertyExist(
Guid id
)
public boolean DoesPropertyExist(
Guid id
)
public function DoesPropertyExist(
id : Guid
) : boolean
Параметры
- id
Тип: System.Guid
The globally unique identifier (GUID) of the property to check for.
Возвращаемое значение
Тип: System.Boolean
true if the specified ExtendedProperty object exists in the ExtendedProperties collection; otherwise, false.
Примеры
This example demonstrates how you can subscribe to the CursorDown event, and the Stroke event to calculate the length of time it takes the user to create a stroke.
At the beginning of a stroke, the CursorDown event fires. The current time is placed into the ExtendedProperties collection of the Stroke object.
Private Sub mInkObject_CursorDown(ByVal sender As Object, ByVal e As InkCollectorCursorDownEventArgs)
' add extended property indicating the time the stroke started
' STROKE_START_GUID is class level string via GUID generator
e.Stroke.ExtendedProperties.Add(New Guid(STROKE_START_GUID), DateTime.Now)
End Sub
private void mInkObject_CursorDown(object sender, InkCollectorCursorDownEventArgs e)
{
// add extended property indicating the time the stroke started
// STROKE_START_GUID is class level string via GUID generator
e.Stroke.ExtendedProperties.Add(new Guid(STROKE_START_GUID), DateTime.Now);
}
When the stroke is complete, the Stroke event fires. The start time is retrieved from the ExtendedProperties collection of the Stroke object, and used to calculate the elapsed time.
Private Sub mInkObject_Stroke1(ByVal sender As Object, ByVal e As InkCollectorStrokeEventArgs)
' check to see if extended property for start time exists
' Attempting to access an extended property that hasn't been created throws an exception
' STROKE_START_GUID is class level string via GUID generator
If (e.Stroke.ExtendedProperties.DoesPropertyExist(New Guid(STROKE_START_GUID))) Then
Dim startTime As DateTime = DirectCast(e.Stroke.ExtendedProperties(New Guid(STROKE_START_GUID)).Data, DateTime)
Dim endTime As DateTime = DateTime.Now
Dim span As TimeSpan = New TimeSpan(endTime.Ticks - startTime.Ticks)
' add extended property indicating the time the stroke ended
' STROKE_END_GUID is class level string via GUID generator
e.Stroke.ExtendedProperties.Add(New Guid(STROKE_END_GUID), endTime)
' display the number of seconds in creating this stroke
Me.statusLabelStrokeTime.Text = span.TotalSeconds.ToString()
End If
End Sub
private void mInkObject_Stroke1(object sender, InkCollectorStrokeEventArgs e)
{
// check to see if extended property for start time exists
// Attempting to access an extended property that hasn't been created throws an exception
// STROKE_START_GUID is class level string via GUID generator
if (e.Stroke.ExtendedProperties.DoesPropertyExist(new Guid(STROKE_START_GUID)))
{
DateTime startTime = (DateTime)e.Stroke.ExtendedProperties[new Guid(STROKE_START_GUID)].Data;
DateTime endTime = DateTime.Now;
TimeSpan span = new TimeSpan(endTime.Ticks - startTime.Ticks);
// add extended property indicating the time the stroke ended
// STROKE_END_GUID is class level string via GUID generator
e.Stroke.ExtendedProperties.Add(new Guid(STROKE_END_GUID), endTime);
// display the number of seconds in creating this stroke
this.statusLabelStrokeTime.Text = span.TotalSeconds.ToString();
}
}
Платформы
Windows Vista
Среды .NET Framework и .NET Compact Framework поддерживают не все версии каждой платформы. Поддерживаемые версии перечислены в разделе Требования к системе для .NET Framework.
Сведения о версии
.NET Framework
Поддерживается в версии: 3.0