將XmlAttribute解析為復雜類型

Question

我正在嘗試創建SVG格式的對象模型。 因此，因為它是XML，所以我正在使用XmlSerializer。 但是我有一個問題。 有一些名為“ style”的xml屬性。 它看起來像復雜類型，但表示為字符串。 有此屬性的示例：

風格= “填充：無;行程：＃00FF00;筆划寬度：8.7489996;卒中miterLimit分別：4;中風不透明度：1;卒中dasharray：無;卒中dashoffset：8.74900006”

如您所見，有諸如“ fill”，“ stroke”，“ stroke-width”等屬性。我編寫了該類

public class SvgStyle
{
    public string FillColor { get; set; }
    public string StrokeColor { get; set; }
    public float StrokeWidth { get; set; }
    public int StrokeMiterlimit { get; set; }
    public float StrokeOpacity { get; set; }
    public float StrokeDashoffset { get; set; }
    public string StrokeDasharray { get; set; }
}

和另一類

public abstract class SvgGraphicElement
{
    [XmlAttribute("style")]
    public SvgStyle Style { get; set; }
}

我所得到的只是例外

無法序列化Svg.SvgStyle類型的成員“ Style”。 XmlAttribute / XmlText不能用於編碼復雜類型。

我嘗試使用IXmlSerializable接口實現和OnSerializing / OnDeserializing方法，但是我得到的只是另一個例外。 有什么辦法可以將此字符串反序列化到我的班級嗎？ 謝謝。

Answer 1

我相信您將需要在SVGStyle類上實現IXmlSerializable接口

http://msdn.microsoft.com/en-us/library/system.xml.serialization.ixmlserializable.aspx

只是讀到您已經嘗試過了； 抱歉。

    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    using System.Threading.Tasks;
    using System.Xml.Serialization;

namespace XmlTypes
{
  public class SvgStyle : IXmlSerializable
  {

    private const string fillColorKey = "fill";
    private const string strokeColorKey ="stroke";
    private const string strokeWidthKey = "stroke-width";
    private const string strokeMiterLimitKey = "stroke-miterlimit";
    private const string strokeOpacityKey ="stroke-opacity";
    private const string strokeDashArrayKey="stroke-dasharray";
    private const string strokeDashOffsetKey = "stroke-dashoffset";

    [XmlAttribute]
    public String Style { get; set; }
    public string FillColor { get; set; }
    public string StrokeColor { get; set; }
    public float StrokeWidth { get; set; }
    public int StrokeMiterlimit { get; set; }
    public float StrokeOpacity { get; set; }
    public float StrokeDashoffset { get; set; }
    public string StrokeDasharray { get; set; }


    public System.Xml.Schema.XmlSchema GetSchema()
    {
      return null;
    }

    public void ReadXml(System.Xml.XmlReader reader)
    {
      reader.MoveToContent();
      Style = reader.GetAttribute("style");
      Dictionary<string, string> lookupTable = ParseAttribute(Style);

      FillColor = lookupTable[fillColorKey];
      StrokeColor = lookupTable[strokeColorKey];

      float strokeWidthFloatValue=0; 
      float.TryParse(lookupTable[strokeWidthKey] , out strokeWidthFloatValue) ;
      StrokeWidth = strokeWidthFloatValue;

      int strokeMiterLimitInt = 0;
      Int32.TryParse(lookupTable[strokeMiterLimitKey] , out strokeMiterLimitInt);
      StrokeMiterlimit = strokeMiterLimitInt;

      int strokeOpacityInt = 0;
      Int32.TryParse(lookupTable[strokeMiterLimitKey], out strokeOpacityInt);
      StrokeOpacity = strokeOpacityInt;

      int strokeDashOffsetInt = 0;
      Int32.TryParse(lookupTable[strokeMiterLimitKey], out strokeDashOffsetInt);
      StrokeDashoffset = strokeDashOffsetInt;

      StrokeDasharray = lookupTable[strokeDashArrayKey];


      Boolean isEmptyElement = reader.IsEmptyElement; // (1)
      reader.ReadStartElement();

    }

    public void WriteXml(System.Xml.XmlWriter writer)
    {
      writer.WriteAttributeString("style", Style);

    }
    private Dictionary<string, string> ParseAttribute(string attribute)
    {
      string[] arr = attribute.Split(';');
      Dictionary<string, string> dic = new Dictionary<string, string>();
      for(int i = 0; i < arr.Length; i++)
      {
        string[] arrItem = arr[i].Split(':');
        dic.Add(arrItem[0], arrItem[1]);
      }
      return dic;
    }    
  }
}





 [TestMethod]
    public void TestMethod1()
    {
      string xml = @"<SvgStyle style='fill:none;stroke:#00ff00;stroke-width:8.7489996;stroke-miterlimit:4;stroke-opacity:1;stroke-dasharray:none;stroke-dashoffset:8.74900006'></SvgStyle>";

      XmlSerializer x = new XmlSerializer(typeof(SvgStyle));
      SvgStyle myTest = (SvgStyle)x.Deserialize(new StringReader(xml));

    }