StrokeCollection.GetPropertyData(Guid) 方法

定义

命名空间:

System.Windows.Ink

程序集:

PresentationCore.dll

返回与指定的 Guid 关联的自定义属性的值。

public:
 System::Object ^ GetPropertyData(Guid propertyDataId);

public object GetPropertyData (Guid propertyDataId);

member this.GetPropertyData : Guid -> obj

Public Function GetPropertyData (propertyDataId As Guid) As Object

参数

propertyDataId

Guid

与要获取的自定义属性关联的 Guid。

返回

Object

与指定 Guid 关联的自定义属性的值。

例外

ArgumentException

propertyDataId 不与 StrokeCollection 的自定义属性关联。

示例

以下示例演示如何添加和获取自定义属性数据。 方法AddTimeStamp_Click使用 AddPropertyData 方法将当前时间添加到 。StrokeCollection 方法 GetTimeStap_Click 使用 GetPropertyData 方法从 StrokeCollection检索时间戳。 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

注解

和 AddPropertyDataGetPropertyData 方法使你能够将自定义属性添加到 StrokeCollection。 然后，可以使用 包含额外信息 StrokeCollection。