如何把System.Windows.Ink.Stroke转换为自定义Stroke？

Question

如何把System.Windows.Ink.Stroke转换为自定义Stroke吗？自定义墨迹继承了Stroke

DesignerStroke s ;
           StrokeCollection strokes = new StrokeCollection(fileStream);
            foreach (var item in strokes)
            {
                s = (DesignerStroke)item;      这几句会报错。无法将类型为“System.Windows.Ink.Stroke”的对象强制转换为类型“HF.WhiteBoardCommon.CanvasDesigner.DesignerStroke”。
                inkcanvas.Strokes.Add(s);
            }

Answer 1

你好,

你可以在转换之前做一个判断，如果是DesignerStroke的话，在转换。下面的代码你可以参考一下。

DesignerStroke s ;
StrokeCollection strokes = new StrokeCollection(fileStream);
foreach (var item in strokes)
 {
     if (item is DesignerStroke)
     {
          s = (DesignerStroke)item;      
          inkcanvas.Strokes.Add(s);
     }
}

Best regards,

Zhanglong

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