Stroke.ContainsPropertyData(Guid) 方法

定義

命名空間:

System.Windows.Ink

組件:

PresentationCore.dll

傳回一個值，指出 Stroke 物件是否包含指定的自訂屬性。

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

屬性的唯一識別項。

傳回

Boolean

如果自訂屬性存在，則傳回 true，否則傳回 false。

範例

下列範例示範如何判斷物件是否有 Stroke 自訂屬性。

// Create a guid for the date/timestamp.
Guid dtGuid = new Guid("03457307-3475-3450-3035-640435034540");

DateTime now = DateTime.Now;

// Check whether the property is already saved
if (thisStroke.ContainsPropertyData(dtGuid))
{
    // Check whether the existing property matches the current date/timestamp
    DateTime oldDT = (DateTime)thisStroke.GetPropertyData(dtGuid);

    if (oldDT != now)
    {
        // Update the current date and time
        thisStroke.AddPropertyData(dtGuid, now);
    }
}

' Create a guid for the date/timestamp.
Dim dtGuid As New Guid("03457307-3475-3450-3035-640435034540")

Dim now As DateTime = DateTime.Now

' Check whether the property is already saved
If thisStroke.ContainsPropertyData(dtGuid) Then
    ' Check whether the existing property matches the current date/timestamp
    Dim oldDT As DateTime = CType(thisStroke.GetPropertyData(dtGuid), DateTime)

    If oldDT <> now Then
        ' Update the current date and time
        thisStroke.AddPropertyData(dtGuid, now)
    End If
End If

另請參閱

• AddPropertyData(Guid, Object)
• GetPropertyData(Guid)
• RemovePropertyData(Guid)