C#常用xml字符串操作

待处理xml：

<sites>
    <site>
        <name>菜鸟教程</name>
        <url>www.runoob.com</url>
    </site>
    <site>
        <name>Google</name>
        <url>www.google.com</url>
    </site>
    <site>
        <name>淘宝</name>
        <url>www.taobao.com</url>
    </site>
</sites>

1、获取指定路径值：

private string GetXmlInnerText(string xml, string xmlUrl, string tagName)
 {

     XmlDocument doc = new XmlDocument();
     doc.LoadXml(xml);

     XmlElement xmlElem = doc.DocumentElement;

     XmlNodeList bodyNode = xmlElem.GetElementsByTagName(tagName);
     if (bodyNode.Count > 0)
     {
         XmlNode totalXml = doc.SelectSingleNode(xmlUrl + "/" + tagName);
         return totalXml.InnerText;
     }
     else
     {
         return string.Empty;
     }
 }

2、合并xml

private string MergeXml(string xml1, string xml2)
{
    XmlDocument xmlDoc1 = new XmlDocument();
    xmlDoc1.LoadXml(xml1);
    XmlDocument xmlDoc2 = new XmlDocument();
    xmlDoc2.LoadXml(xml2);
    XmlNode root1 = xmlDoc1.DocumentElement;
    XmlNodeList xmlNodeList = xmlDoc2.DocumentElement.ChildNodes;
    XmlNode root2;
    foreach (XmlNode item in xmlNodeList)
    {
        root2 = xmlDoc1.ImportNode(item, true);
        root1.AppendChild(root2);
    }
    return xmlDoc1.InnerXml;
}

3、XMLToDataSet转换

private int ConvertXmlToDataSet(string xmlData, out DataSet xmlDs, out string errText)
{
    var iRet = 1;
    XmlTextReader reader = null;

    errText = string.Empty;
    xmlDs = new DataSet();
    try
    {
        var stream = new StringReader(xmlData);
        using (reader = new XmlTextReader(stream))
        {
            xmlDs.ReadXml(reader);
        }
    }
    catch (Exception err)
    {
        errText = err.Message;
        iRet = -1;
    }
    finally
    {
        if (reader != null)
        {
            reader.Close();
        }
    }

    return iRet;
}