如何：将文本绘制到 Visual 中

以下示例演示如何使用 DrawingVisual 对象将文本绘制到 DrawingContext。 通过调用 RenderOpen 对象的 DrawingVisual 方法返回绘图上下文。 您可以在绘图上下文中绘制图形和文本。

若要将文本绘制到绘图上下文中，请使用 DrawText 对象的 DrawingContext 方法。 在绘图上下文中绘制完内容后，调用 Close 方法以关闭绘图上下文并保留内容。

示例：

// Create a DrawingVisual that contains text.
private DrawingVisual CreateDrawingVisualText()
{
    // Create an instance of a DrawingVisual.
    DrawingVisual drawingVisual = new DrawingVisual();

    // Retrieve the DrawingContext from the DrawingVisual.
    DrawingContext drawingContext = drawingVisual.RenderOpen();

    // Draw a formatted text string into the DrawingContext.
    drawingContext.DrawText(
       new FormattedText("Click Me!",
          CultureInfo.GetCultureInfo("en-us"),
          FlowDirection.LeftToRight,
          new Typeface("Verdana"),
          36, System.Windows.Media.Brushes.Black),
          new System.Windows.Point(200, 116));

    // Close the DrawingContext to persist changes to the DrawingVisual.
    drawingContext.Close();

    return drawingVisual;
}

' Create a DrawingVisual that contains text.
Private Function CreateDrawingVisualText() As DrawingVisual
    ' Create an instance of a DrawingVisual.
    Dim drawingVisual As New DrawingVisual()

    ' Retrieve the DrawingContext from the DrawingVisual.
    Dim drawingContext As DrawingContext = drawingVisual.RenderOpen()

    ' Draw a formatted text string into the DrawingContext.
    drawingContext.DrawText(New FormattedText("Click Me!", CultureInfo.GetCultureInfo("en-us"), FlowDirection.LeftToRight, New Typeface("Verdana"), 36, Brushes.Black), New Point(200, 116))

    ' Close the DrawingContext to persist changes to the DrawingVisual.
    drawingContext.Close()

    Return drawingVisual
End Function