读取,添加，修改xml文件

/// <summary>
/// 读取,添加，修改xml文件
/// </summary>
/// <param name="Xmlpath">Xml路径</param>
/// <param name="Node">新的子节点名称</param>
/// <param name="Value">新节点对应的值</param>
/// <param name="flag">1：读取，否则为 修改或者添加</param>
/// <returns>1：修改添加成功，为空字符串表示修改添加成功，否则是读取成功</returns>
public static string getXML(string Xmlpath, string Node, string Value, int flag)
{
try
{
string filepath = HttpContext.Current.Server.MapPath(Xmlpath);
XmlDocument xmlDoc = new XmlDocument();
if (!File.Exists(filepath))
{
XmlDeclaration xn = xmlDoc.CreateXmlDeclaration("1.0", "utf-8", null);
XmlElement root = xmlDoc.CreateElement("rss");
XmlElement root1 = xmlDoc.CreateElement("item");

root.AppendChild(root1);
xmlDoc.AppendChild(xn);
xmlDoc.AppendChild(root);
xmlDoc.Save(filepath);//本地路径名字
}
xmlDoc.Load(filepath);//你的xml文件
string ReStr = string.Empty;
XmlElement xmlObj = xmlDoc.DocumentElement;

XmlNodeList xmlList = xmlDoc.SelectSingleNode(xmlObj.Name.ToString()).ChildNodes;

foreach (XmlNode xmlNo in xmlList)
{
if (xmlNo.NodeType != XmlNodeType.Comment)//判断是不是注释类型
{
XmlElement xe = (XmlElement)xmlNo;
{
if (xe.Name == xmlObj.FirstChild.Name)
{
XmlNodeList xmlNList = xmlObj.FirstChild.ChildNodes;

foreach (XmlNode xmld in xmlNList)
{
XmlElement xe1 = (XmlElement)xmld;
{
if (xe1.Name == Node)
{
if (flag == 1)//读取值
{
if (xmld.InnerText != null && xmld.InnerText != "")
{
ReStr = xmld.InnerText;
}
}
else//修改值
{
xmld.InnerText = Value;//给节点赋值
xmlDoc.Save(filepath);
ReStr = Value.Trim();
}
}
}
}
if (ReStr == string.Empty)// 添加节点
{
XmlNode newNode;
newNode = xmlDoc.CreateNode("element", Node, Value);//创建节点
newNode.InnerText = Value;//给节点赋值
xe.AppendChild(newNode);//把节点添加到doc
xmlDoc.Save(filepath);
ReStr = Value.Trim();
}
}
}
}
}
return ReStr;
}
catch
{
return string.Empty;
}
}