StrokeCollection.ContainsPropertyData(Guid) 方法

定义

命名空间:

System.Windows.Ink

程序集:

PresentationCore.dll

返回一个值，指出指定的自定义属性标识符是否在 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

参数

propertyDataId

Guid

要在 Guid 中定位的 StrokeCollection。

返回

Boolean

如果指定的自定义属性标识符在 StrokeCollection 中，则返回 true；否则返回 false。

示例

以下示例演示如何检查 中的 StrokeCollection自定义属性。 如果自定义属性已与 timestamp相关联，则示例获取该自定义属性并显示保存 时间 StrokeCollection 。 此示例假定有一个名为 InkCanvas 的 inkCanvas1。

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