c#讀取帶有命名空間的XML

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XML檔案內容

<?xml version="1.0" standalone="no"?><svg width="1709px" height="886px"  onload="init(evt)"  viewBox="0 0 1800 900" xmlns="http://www.w3.org/2000/svg"  xmlns:xlink="http://www.w3.org/1999/xlink" preserveAspectRatio="xMidYMid">   <rect width="1709px" height="886px" fill="GradientInactiveCaption" />   <rect x="88" y="369" width="1200px" height="15px" stroke-width="1" stroke="Black" fill="url(#79)" />   <rect id="REED.ShapeElement.TrapezoidR" x="491" y="283" width="80px" height="185px" stroke-width="1" stroke="Transparent" fill="Transparent" /></svg>

以下是讀取方法：

class Program    {        static void Main(string[] args)        {            try            {                XmlDocument xmlDoc = new XmlDocument();                 xmlDoc.Load("F:\\汽機本體2.svg");                XmlNamespaceManager nsmgr = new XmlNamespaceManager(xmlDoc.NameTable);                nsmgr.AddNamespace("ns", "http://www.w3.org/2000/svg");                XmlNode xn = xmlDoc.SelectSingleNode("//ns:svg", nsmgr);                XmlNodeList xnl = xn.ChildNodes;                Console.WriteLine("讀取成功");                Console.ReadLine();            }            catch (Exception ex)            {                Console.WriteLine(ex.ToString());                Console.ReadLine();                throw;            }                    }    }