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C#操作XML文件实例汇总

2014-08-20 17:30 1481 查看

针对XML文件的操作是C#程序设计中非常常见的功能。本文即以实例展示了C#操作XML文件的几个常见的示例。具体如下：

1.返回节点下标

public static XmlDocument getDoc(String path)//加载xml文档
{
XmlDocument doc = new XmlDocument();
doc.Load(path);
return doc;
}
/// <summary>
/// 返回找到的节点下标
/// </summary>
/// <param name="path">xml文件路径</param>
/// <param name="bname">书名</param>
/// <returns></returns>
public static int getPosition(String path,string node, String bname)
{
int i;
XmlDocument doc = new XmlDocument();
doc.Load(path);
XmlNodeList nodeList = doc.SelectSingleNode(node).ChildNodes;
for (i = 0; i < nodeList.Count; i++)
{
if (nodeList[i].ChildNodes[0].InnerText == bname)
{
return i;
}
}
return -1;
}

2.遍历数据

/// <summary>
/// 遍历数据
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void btnRead_Click(object sender, EventArgs e)
{

XmlDocument doc = getDoc("books.xml");//加载xml文档，books文件存放于
foreach (XmlElement root in doc.DocumentElement.ChildNodes)//遍历根的子节点
{
Response.Write("<script>document.write('<br/>');</script>");
Response.Write("<script>document.write('" + root.Name + "');</script>");//节点名root.Name book
foreach (XmlElement item in root.ChildNodes)
{
Response.Write("<script>document.write('" + item.Name + "'+':'+'" + item.InnerText + "');</script>");//输出节点名和文本节点的值
Response.Write("<script>document.write('<br/>');</script>");
}
}
}

3.查找

/// <summary>
/// 查找
/// </summary>
/// <param name="path">文件路径</param>
/// <param name="node">节点</param>
/// <param name="bname">查找关键字</param>
/// <returns>XmlNode</returns>
public static XmlNode Find(string path,string node,string bname)
{
XmlDocument doc = new XmlDocument();
doc.Load(path);//加载xml文档
XmlNodeList nodeList = doc.SelectSingleNode(node).ChildNodes;
int i = getPosition(path, node, bname);//
if (i >= 0)
return nodeList[i];
else
return null;
}

4.删除节点

/// <summary>
/// 删除元素、属性
/// </summary>
/// <param name="path">文件</param>
/// <param name="node">指定节点的父节点</param>
/// <param name="attribute">为空时删除节点，否则删除属性</param>
/// <param name="bname"></param>
public static void Delete(string path,string node,string attribute,string bname)
{
XmlDocument doc = new XmlDocument();
doc.Load(path);
XmlNode root = doc.SelectSingleNode(node);
XmlNodeList nodeList = doc.SelectSingleNode(node).ChildNodes;
int i = getPosition(path, node, bname);//返回指定的节点下标
if (i >= 0)
{
if (attribute.Equals(""))
{
root.RemoveChild(nodeList[i]);
}
else
{
XmlElement xn = (XmlElement)nodeList[i];
xn.RemoveAttribute(attribute);
}
}
doc.Save(path);
}

5.添加

/// <summary>
/// 添加元素值
/// </summary>
/// <param name="path"></param>
/// <param name="node"></param>
/// <param name="element"></param>
/// <param name="value"></param>
/// <param name="i">插入的下标，如果为负，默认从最后一个节点插入</param>
/// <returns></returns>
public static bool Add(string path,string node,string element,string value,int i)
{
XmlDocument doc = new XmlDocument();
doc.Load(path);
XmlNodeList nodeList = doc.SelectNodes(node);
XmlNode newNode = doc.SelectSingleNode(node).LastChild;
if (i < 0 || i > nodeList.Count-1)//如果小于0或者大于节点长度，默认从最后一个节点添加
{
XmlElement newElement = doc.CreateElement(element);//创建元素
newElement.InnerText = value;//赋值
newNode.AppendChild(newElement);
}
else
{
XmlElement newElement = doc.CreateElement(element);
newElement.InnerText = value;
nodeList[i - 1].AppendChild(newElement);
}
doc.Save(path);
return true;
}

希望本文所述方法对大家的C#程序设计能有所帮助。

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标签： C# 操作 XML

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