<?xml version="1.0" encoding="utf-8"?><Sudent><StudentID>0000</StatusCode><StudentName>張三</StatusDesc></Sudent><StudentTec>魏老師</StudentTec>

  #region 遍历基本的XMLXElement root = XElement.Load(@"D:\test.xml");         //根據Elements 遍歷foreach (XElement item in root.Elements("StudentID")){Console.WriteLine(item);}//根據Lambda 遍歷var query = root.Elements().Select(u => u);foreach (var q in query){Console.WriteLine(q);}//根據Nodes 遍歷foreach (var item in root.Nodes()){if (item.NextNode.ToString() == "StudentName"){Console.WriteLine(item.Document);}Console.WriteLine(item);} #endregion

<?xml version="1.0" encoding="UTF-8"?>
<ns0:Envelope xmlns:x0="http://www.w3school.com.cn/Envelope"
xmlns:x1="http://www.w3school.com.cn/Header" ><x1:Header><x1:Type>ICC</x1:dType><x1:Version>01</x1:Version></x1:Header><x2:Body xmlns:x2="http://www.w3school.com.cn/Body" xmlns:x3="http://www.w3school.com.cn/IBBC/01" xmlns:x4="http://www.w3school.com.cn/ICCB/01"><x3:SecondInform><x4:Status><x4:StatusCode>0000</x4:StatusCode></x4:Status>        </x3:SecondInform></x2:Body>
</x0:Envelope>

<?xml version="1.0" encoding="utf-8"?>
<x0:Envelope xmlns:x0="http://www.w3school.com.cn/Envelope"><x1:Header xmlns:x1="http://www.w3school.com.cn/Header"><x1:Type>ICC</x1:dType><x1:Version>01</x1:Version></x1:Header><x1:Body xmlns:x1="http://www.w3school.com.cn/Body"><x2:IBBC xmlns:x2="http://ns.chinatrust.com.tw/XSD/CTCB/BC/Message/IBBC/01"><x2:SecondInform><x2:Status><x2:StatusCode>0000</x4:StatusCode></x2:Status>        </x2:SecondInform></x1:Body>
</x0:Envelope>

public string ReadXMl(string xmlurl)
{           XmlDocument xml = new XmlDocument();xml.Load(xmlurl);        var xmlnsm = new XmlNamespaceManager(xml.NameTable);xmlnsm.AddNamespace("x0", @"http://www.w3school.com.cn/Envelope");xmlnsm.AddNamespace("x2", @"http://www.w3school.com.cn/Body");xmlnsm.AddNamespace("x3", @"http://www.w3school.com.cn/IBBC/01");xmlnsm.AddNamespace("x4", @"http://www.w3school.com.cn/ICCB/01"); //对A中元素取值string laa = xml.SelectSingleNode("x0:Envelope/x2:Body/x3:SecondInform/x4:Status/x4:StatusCode", xmlnsm).InnerText; //对B中元素取值string lab = xml.SelectSingleNode("x0:Envelope/x2:Body/x2:IBBC/x2:SecondInform/x2:Status/x2:StatusCode", xmlnsm).InnerText;//修改XML中的值
//xelement.SetAttributeValue(namespacehaif + Labelname, "50000"); // xml.Save(xmlurl); return lab; }

public string ReadXMl(string xmlurl)
{           XElement xml = XElement.Load(xmlpath);        XNamespace x0 = @"http://www.w3school.com.cn/Envelope"; XNamespace x2 = @"http://www.w3school.com.cn/Body";XNamespace x3 = @"http://www.w3school.com.cn/IBBC/01";XNamespace x4 = @"http://www.w3school.com.cn/ICCB/01";//对A中元素取值string laa = xml.Descendants(x4+"StatusCode").FirstOrDefault().Value.ToString(); //对B中元素取值string lab = xml.Descendants(x2+"StatusCode").FirstOrDefault().Value.ToString(); return lab; }