C# 日常整理

1.读取带namespace的xml

 public static string ReadXml(string path, string nodeName)
        {
            var xmlString = string.Empty;
            try
            {
                var xml = new XmlDocument();
                xml.Load(path);


                XmlElement root = xml.DocumentElement;
                string nameSpace = root.NamespaceURI;
                XmlNamespaceManager nsmgr = new XmlNamespaceManager(xml.NameTable);
                nsmgr.AddNamespace("xsi", "http://www.w3.org/2001/XMLSchema-instance");
                nsmgr.AddNamespace("nsCommon", "http://www.joia.or.jp/standardized/namespaces/Common");
                nsmgr.AddNamespace("nsREF", "http://www.joia.or.jp/standardized/namespaces/REF");
                nsmgr.AddNamespace("schemaLocation", "http://www.joia.or.jp/standardized/namespaces/Common Common_schema.xsd http://www.joia.or.jp/standardized/namespaces/REF REF_schema.xsd");

                if (root == null) return xmlString;
                var node = root.SelectSingleNode(nodeName, nsmgr);
                if (node != null)
                {
                    xmlString = node.InnerText;
                }
            }
            catch (Exception er)
            {
                throw new Exception(er.ToString());
            }
            //Console.WriteLine(xmlString);
            return xmlString;
        }