Silverlight 3：将 XML 笔划集合转换回笔划集合？

Question

我有一个 silverlight 应用程序，允许用户在其上绘图并保存绘图。

画布中的笔画集合被转换为xml属性并存储在数据库中。

我现在遇到的唯一问题是将 xml 转换回笔画集合。

我的笔画存储如下：

<Strokes>    
  <Stroke>    
    <Color A="255" R="0" G="0" B="0" />      
    <OutlineColor A="0" R="0" G="0" B="0" />      
  <Points>
    <Point X="60" Y="57" PressureFactor="0.5" />        
    <Point X="332" Y="52" PressureFactor="0.5" />      
  </Points>      
  <Width>3</Width>      
  <Height>3</Height>    
  </Stroke>  
</Strokes>

Answer 1

这是您的代码，经过严格考虑：-

private StrokeCollection CreateStrokeCollection(string XMLStrokes)
{
  XElement xmlElem;
  try
  {
    return CreateStrokeCollect(XElement.Parse(XMLStrokes).Root);
  }
  catch (XmlException ex)
  {
    return new StrokeCollection();
  }
}

private StrokeCollection CreateStrokeCollection(XElement elem)
{  
  StrokeCollection result= new StrokeCollection();
  foreach (XElement elem in xmlElement.Elements("Stroke"))
  {
     result.Add(CreateStroke(elem));
  }
  return result;
}


private Stroke CreateStroke(XElement elem)
{
  var result = new Stroke();
  result.DrawingAttributes = CreateAttributes(elem);
  result.StylusPoints.Add(CreatePointCollection(elem.Element("Points"));
  return result;
}

private StylusPointCollection CreatePointCollection(XElement elem)
{
  var result = new StylusPointCollection();
  foreach (XElment pointElem in elem.Elements("Point"))
  {
    result.Add(CreateStylusPoint(pointElem));
  }
  return result;
}

private StylusPoint CreateStylusPoint(XElement elem)
{
    double x = Convert.ToDouble(point.Attribute("X").Value);
    double y = Convert.ToDouble(point.Attribute("Y").Value);
    return new StylusPoint(x, y);
}

private DrawingAttributes CreateAttributes(XElement elem)
{
   var result = new DrawingAttributes();
   result.Color = CreateColor(elem.Element("Color"));
   result.OutlineColor = CreateColor(elem.Element("OutlineColor"));
   result.Width = Convert.ToInt32(elem.Element("Width").Value);
   result.Height = Convert.ToInt32(elem.Element("Height").Value);
   return result ;
}

private Color CreateColor(XElement elem)
{
  byte colorA = Convert.ToByte(color.Attribute("A").Value);
  byte colorR = Convert.ToByte(color.Attribute("R").Value);
  byte colorG = Convert.ToByte(color.Attribute("G").Value);
  byte colorB = Convert.ToByte(color.Attribute("B").Value);

  return Color.FromArgb(colorA, colorR, colorG, colorB);       
}

Answer 2

这是我的解决方案......在我真正坐下来查看它之前，我似乎认为它太混乱了：

private StrokeCollection CreateStrokeCollectionfromXML(string XMLStrokes)
    {
        XElement xmlElem;
        try
        {
            xmlElem = XElement.Parse(XMLStrokes);
        }
        catch (XmlException ex)
        {
            return new StrokeCollection();
        }
        StrokeCollection objStrokes = new StrokeCollection();
        //Query the XML to extract the Strokes
        var strokes = from s in xmlElem.Descendants("Stroke") select s;
        foreach (XElement strokeNodeElement in strokes)
        {
            var color = (from c in strokeNodeElement.Descendants("Color")
                        select c).FirstOrDefault();
            DrawingAttributes attributes = new DrawingAttributes();

            byte colorA = Convert.ToByte(color.Attribute("A").Value);
            byte colorR = Convert.ToByte(color.Attribute("R").Value);
            byte colorG = Convert.ToByte(color.Attribute("G").Value);
            byte colorB = Convert.ToByte(color.Attribute("B").Value);

            attributes.Color = Color.FromArgb(colorA, colorR, colorG, colorB);

            var outlineColor = (from oc in strokeNodeElement.Descendants("OutlineColor")
                                select oc).FirstOrDefault();

            byte outlineColorA = Convert.ToByte(outlineColor.Attribute("A").Value);
            byte outlineColorR = Convert.ToByte(outlineColor.Attribute("R").Value);
            byte outlineColorG = Convert.ToByte(outlineColor.Attribute("G").Value);
            byte outlineColorB = Convert.ToByte(outlineColor.Attribute("B").Value);

            attributes.OutlineColor = Color.FromArgb(outlineColorA, outlineColorR, outlineColorG, outlineColorB);

            attributes.Width = Convert.ToInt32(strokeNodeElement.Descendants("Width").FirstOrDefault().Value);
            attributes.Height = Convert.ToInt32(strokeNodeElement.Descendants("Height").FirstOrDefault().Value);

            var points = from p in strokeNodeElement.Descendants("Point")
                         select p;
            StylusPointCollection pointData = new System.Windows.Input.StylusPointCollection();

            foreach (XElement point in points)
            {
                double Xvalue = Convert.ToDouble(point.Attribute("X").Value);
                double Yvalue = Convert.ToDouble(point.Attribute("Y").Value);
                pointData.Add(new StylusPoint(Xvalue, Yvalue));
            }

            Stroke newstroke = new Stroke();
            newstroke.DrawingAttributes = attributes;
            newstroke.StylusPoints.Add(pointData);
            //add the new stroke to the StrokeCollection
            objStrokes.Add(newstroke);
        }
        return objStrokes;
    }