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StylusPoint.Description Propriété

Définition

Obtient ou définit le StylusPointDescription qui spécifie les propriétés stockées dans le StylusPoint.

public System.Windows.Input.StylusPointDescription Description { get; }

Valeur de propriété

Le StylusPointDescription spécifie les propriétés stockées dans le StylusPoint.

Exemples

L’exemple suivant utilise la Description propriété pour obtenir les valeurs de propriété à partir d’un StylusPointStylusPointCollection. Cet exemple suppose qu’il existe un TextBlock appelé packetOutput.

private void WriteStylusPointValues(StylusPointCollection points)
{
    StylusPointDescription pointsDescription = points.Description;

    ReadOnlyCollection<StylusPointPropertyInfo> properties = 
        pointsDescription.GetStylusPointProperties();
    
    // Write the name and value of each property in
    // every stylus point.
    StringWriter packetWriter = new StringWriter();
    packetWriter.WriteLine("{0} stylus points", points.Count.ToString());
    foreach (StylusPoint stylusPoint in points)
    {
        packetWriter.WriteLine("Stylus Point info");
        packetWriter.WriteLine("X: {0}", stylusPoint.X.ToString());
        packetWriter.WriteLine("Y: {0}", stylusPoint.Y.ToString());
        packetWriter.WriteLine("Pressure: {0}", stylusPoint.PressureFactor.ToString());

        // Get the property name and value for each StylusPoint.
        // Note that this loop reports the X, Y, and pressure values differantly than 
        // getting their values above.
        for (int i = 0; i < pointsDescription.PropertyCount; ++i)
        {
            StylusPointProperty currentProperty = properties[i];

            // GetStylusPointPropertyName is defined below and returns the
            // name of the property.
            packetWriter.Write("{0}: ", GetStylusPointPropertyName(currentProperty));
            packetWriter.WriteLine(stylusPoint.GetPropertyValue(currentProperty).ToString());
        }
        packetWriter.WriteLine();
    }

    packetOutput.Text = packetWriter.ToString();
}
// Use reflection to get the name of currentProperty.
private string GetStylusPointPropertyName(StylusPointProperty currentProperty)
{
    Guid guid = currentProperty.Id;

    // Iterate through the StylusPointProperties to find the StylusPointProperty
    // that matches currentProperty, then return the name.
    foreach (FieldInfo theFieldInfo
        in typeof(StylusPointProperties).GetFields())
    {
        StylusPointProperty property = (StylusPointProperty) theFieldInfo.GetValue(currentProperty);
        if (property.Id == guid)
        {
            return theFieldInfo.Name;
        }
    }
    return "Not found";
}

S’applique à

Produit Versions
.NET Framework 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
Windows Desktop 3.0, 3.1, 5, 6, 7, 8, 9