c# – 如何根据某个属性选择一个xml元素,并将其写回另一个文件中

我正在使用XmlTextReader读取svg / xml,我想在新的svg / xml文件中写回一些元素

<svg>
    <rect x="135.7" y="537.4" fill="none" stroke="#000000" stroke-width="0.2894" width="36.6" height="42.2"/>
    <rect x="99" y="537.4" fill="#A0C9EC" stroke="#000000" stroke-width="0.2894" width="36.7" height="42.2"/>
</svg>

我想要填充“none”的rect元素,所以我开始阅读和写作

var reader = new XmlTextReader(file.InputStream);
 var writer = new XmlTextWriter(svgPath + filenameWithoutExtension + "-less" + extension,null);
 writer.WriteStartDocument();
 while (reader.Read())
 {
    switch (reader.NodeTypE)
    {
         case XmlNodeType.Element:
         if (reader.Name == "svg")
         {
            writer.WriteStartElement(reader.Name);
            while(reader.MoveToNextAttribute()){
                 writer.WriteAttributes(reader,truE);
            }
         }
         if (reader.Name == "rect" || reader.Name == "polygon")
         {
            while(reader.MoveToNextAttribute()){
                 if(reader.Name == "fill" && reader.value == "none"){
                     writer.WriteStartElement(reader.Name);
                     writer.WriteAttributes(reader,truE);
                     writer.WriteEndElement();
                 }
            }
         }
         break;
         case XmlNodeType.EndElement:
              break;

         default:
              break;
    }
 }
 writer.WriteEndElement();
 writer.WriteEndDocument();
 writer.Close();

但是返回一个带有“fill”元素且没有“x”和“y”属性的文件(因为WriteAttributes从当前位置读取而读取器位于fill属性中)

<svg>
     <fill="none" stroke="#000000" stroke-width="0.2894" width="36.6" height="42.2"/>
 </svg>

有没有办法得到我想要的结果？我不想使用XmlDocument,因为我的svg文件很大,需要很长时间才能加载XmlDoc.Load

谢谢

if (reader.Name == "rect" || reader.Name == "polygon") 
     { 
           String fill = reader.GetAttribute("fill"); //Read ahead for the value of the fill attr
           if(String.Compare(fill,"none",StringComparison.InvariantCultureIgnoreCasE) == 0) //if the value is what we expect then just wholeSALE copy this node.
           {
                writer.WriteStartElement(reader.Name);
                writer.WriteAttributes(reader,truE); 
                writer.WriteEndElement(); 
            } 
        }

//rect[@fill='none'] || //polygon[@fill='none']