Question

wpf 图片怎么定义的

Answer 1

1、使用DrawingVisual绘制你的内容：
var drawingVisual = new DrawingVisual();
using(var drawingContext = drawingVisual.RenderOpen())
{
var text = new FormattedText(.....);
var position = new Point(......);
drawingVisual.DrawText(text, position);
}

2、用RenderTargetBitmap渲染成位图：
var renderTargetBitmap = new RenderTargetBitmap(.....);
renderTargetBitmap.Render(drawingVisual);

3、选用一种BitmapEncoder保存，比如PngBitmapEncoder：
var encoder = new PngBitmapEncoder();
var frame = BitmapFrame.Create(renderTargetBitmap);
encoder.Frames.Add(frame);
encoder.Save(...);