StrokeCollection.ContainsPropertyData(Guid) 方法

定義

命名空間:

System.Windows.Ink

組件:

PresentationCore.dll

傳回指定的自訂屬性識別碼是否存在於 StrokeCollection 中。

public:
 bool ContainsPropertyData(Guid propertyDataId);

public bool ContainsPropertyData (Guid propertyDataId);

member this.ContainsPropertyData : Guid -> bool

Public Function ContainsPropertyData (propertyDataId As Guid) As Boolean

參數

propertyDataId

Guid

要在 StrokeCollection 中尋找的 Guid。

傳回

Boolean

如果指定的自訂屬性識別碼存在於 StrokeCollection 中，則為 true，否則為 false。

範例

下列範例示範如何在 中 StrokeCollection 檢查自訂屬性。 如果自訂屬性已與 timestamp 相關聯，則此範例會取得該自訂屬性，並在儲存 時 StrokeCollection 顯示 。 此範例假設有 InkCanvas 名為 inkCanvas1 的 。

Guid timestamp = new Guid("12345678-9012-3456-7890-123456789012");

// Add a timestamp to the StrokeCollection.
private void AddTimestamp_Click(object sender, RoutedEventArgs e)
{

    inkCanvas1.Strokes.AddPropertyData(timestamp, DateTime.Now);
}

// Get the timestamp of the StrokeCollection.
private void GetTimestamp_Click(object sender, RoutedEventArgs e)
{

    if (inkCanvas1.Strokes.ContainsPropertyData(timestamp))
    {
        object date = inkCanvas1.Strokes.GetPropertyData(timestamp);

        if (date is DateTime)
        {
            MessageBox.Show("This StrokeCollection's timestamp is " +
                ((DateTime)date).ToString());
        }
    }
    else
    {
        MessageBox.Show(
            "The StrokeCollection does not have a timestamp.");
    }
}

Private timestamp As New Guid("12345678-9012-3456-7890-123456789012")

' Add a timestamp to the StrokeCollection.
Private Sub AddTimestamp_Click(ByVal sender As Object, ByVal e As RoutedEventArgs)

    inkCanvas1.Strokes.AddPropertyData(timestamp, DateTime.Now)

End Sub

' Get the timestamp of the StrokeCollection.
Private Sub GetTimestamp_Click(ByVal sender As Object, ByVal e As RoutedEventArgs)

    If inkCanvas1.Strokes.ContainsPropertyData(timestamp) Then

        Dim savedDate As Object = inkCanvas1.Strokes.GetPropertyData(timestamp)

        If TypeOf savedDate Is DateTime Then
            MessageBox.Show("This StrokeCollection's timestamp is " & _
                CType(savedDate, DateTime).ToString())
        End If
    Else
        MessageBox.Show("The StrokeCollection does not have a timestamp.")
    End If

End Sub