xml读写

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Posted on 2014-10-28 14:35 云起阅读(388) 评论(0) 编辑收藏举报

吾乃xml大白，最近用于项目要更改程序配置文件，最终以xml读写方式进行。

插叙：xml简单介绍http://www.cnblogs.com/jb8164/articles/736515.html；

更改值，如没有对应的key，进行新建。

private void ModifyXML(string path,string NodeName,string AppKey,string AppValue)
       {
           try
           {
               System.Xml.XmlDocument xDoc = new System.Xml.XmlDocument();
               xDoc.Load(path);
 
               System.Xml.XmlNode xNode;
               System.Xml.XmlElement xElem1;
               System.Xml.XmlElement xElem2;
               xNode = xDoc.SelectSingleNode("//" + NodeName);
 
               xElem1 = (System.Xml.XmlElement)xNode.SelectSingleNode("//add[@key='" + AppKey + "']");
 
               string p1 = xElem1.GetAttribute("value");
 
               if (xElem1 != null) xElem1.SetAttribute("value", AppValue);
               else
               {
                   xElem2 = xDoc.CreateElement("add");
                   xElem2.SetAttribute("key", AppKey);
                   xElem2.SetAttribute("value", AppValue);
                   xNode.AppendChild(xElem2);
               }
               xDoc.Save(path);
           }
           catch (Exception ex)
           {
           }
       }

获取值

private string ReadXML(string path, string NodeName, string AppKey)
        {
            try
            {
                System.Xml.XmlDocument xDoc = new System.Xml.XmlDocument();
                xDoc.Load(path);
 
                System.Xml.XmlNode xNode;
                System.Xml.XmlElement xElem1;
                System.Xml.XmlElement xElem2;
                xNode = xDoc.SelectSingleNode("//" + NodeName);
 
                xElem1 = (System.Xml.XmlElement)xNode.SelectSingleNode("//add[@key='" + AppKey + "']");
                return xElem1.GetAttribute("value");
            }
            catch (Exception ex)
            {
                return "";
            }
        }