ExtendedProperties.DoesPropertyExist 方法

表示指定的 ExtendedProperty 物件是否存在於 ExtendedProperties 集合中。

命名空間：  Microsoft.Ink
組件：  Microsoft.Ink (在 Microsoft.Ink.dll 中)

語法

'宣告
Public Function DoesPropertyExist ( _
    id As Guid _
) As Boolean
'用途
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

參數

• id
  型別：System.Guid
  要檢查之屬性的全域唯一識別項 (GUID)。

傳回值

型別：System.Boolean
如果指定的 ExtendedProperty 物件存在於 ExtendedProperties 集合中，則為 true，否則為 false。

範例

這個範例會示範如何訂閱 CursorDown 事件和 Stroke 事件，計算使用者建立筆劃所需的時間長度。

筆劃開始時，會引發 CursorDown 事件。目前的時間會放入 Stroke 物件的 ExtendedProperties 集合。

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);
}

筆劃完成時，會引發 Stroke 事件。開始時間是擷取自 Stroke 物件的 ExtendedProperties 集合，並且用來計算經過的時間。

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();
    }
}

平台

Windows Vista

.NET Framework 和 .NET Compact Framework 並不支援各種平台的所有版本。如需支援平台版本的相關資訊，請參閱 .NET Framework 系統需求。

版本資訊

.NET Framework

支援版本：3.0

請參閱

參考

ExtendedProperties 類別

ExtendedProperties 成員

Microsoft.Ink 命名空間