C#读写XML的基本方法

C#中xml读写文件的方法（xmlreader,xmlwriter）

有几种方法，可以看一下。

http://fmouz.spaces.live.com/blog/cns!A3E6BF121783821A!22035.entry

【转】c#读写xml文件入门方法

已知有一个XML文件（bookstore.xml）如下：
<?xml version="1.0" encoding="gb2312"?>
<bookstore>
<book genre="fantasy" ISBN="2-3631-4">
<title>Oberon's Legacy</title>
<author>Corets, Eva</author>
<price>5.95</price>
</book>
</bookstore>

1、往<bookstore>节点中插入一个<book>节点：
XmlDocument xmlDoc=new XmlDocument();
xmlDoc.Load("bookstore.xml");
XmlNode root=xmlDoc.SelectSingleNode("bookstore");//查找<bookstore>
XmlElement xe1=xmlDoc.CreateElement("book");//创建一个<book>节点
xe1.SetAttribute("genre","李赞红");//设置该节点genre属性
xe1.SetAttribute("ISBN","2-3631-4");//设置该节点ISBN属性

XmlElement xesub1=xmlDoc.CreateElement("title");
xesub1.InnerText="CS从入门到精通";//设置文本节点
xe1.AppendChild(xesub1);//添加到<book>节点中
XmlElement xesub2=xmlDoc.CreateElement("author");
xesub2.InnerText="候捷";
xe1.AppendChild(xesub2);
XmlElement xesub3=xmlDoc.CreateElement("price");
xesub3.InnerText="58.3";
xe1.AppendChild(xesub3);

root.AppendChild(xe1);//添加到<bookstore>节点中
xmlDoc.Save("bookstore.xml");
//===============================================
结果为：
<?xml version="1.0" encoding="gb2312"?>
<bookstore>
<book genre="fantasy" ISBN="2-3631-4">
<title>Oberon's Legacy</title>
<author>Corets, Eva</author>
<price>5.95</price>
</book>
<book genre="李赞红" ISBN="2-3631-4">
<title>CS从入门到精通</title>
<author>候捷</author>
<price>58.3</price>
</book>
</bookstore>

2、修改节点：将genre属性值为“李赞红“的节点的genre值改为“update李赞红”，将该节点的子节点<author>的文本修改为“亚胜”。
XmlNodeList nodeList=xmlDoc.SelectSingleNode("bookstore").ChildNodes;//获取bookstore节点的所有子节点
foreach(XmlNode xn in nodeList)//遍历所有子节点
{
XmlElement xe=(XmlElement)xn;//将子节点类型转换为XmlElement类型
if(xe.GetAttribute("genre")=="李赞红")//如果genre属性值为“李赞红”
{
xe.SetAttribute("genre","update李赞红");//则修改该属性为“update李赞红”

XmlNodeList nls=xe.ChildNodes;//继续获取xe子节点的所有子节点
foreach(XmlNode xn1 in nls)//遍历
{
XmlElement xe2=(XmlElement)xn1;//转换类型
if(xe2.Name=="author")//如果找到
{
xe2.InnerText="亚胜";//则修改
break;//找到退出来就可以了
}
}
break;
}
}

xmlDoc.Save("bookstore.xml");//保存。
//==================================================
最后结果为：
<?xml version="1.0" encoding="gb2312"?>
<bookstore>
<book genre="fantasy" ISBN="2-3631-4">
<title>Oberon's Legacy</title>
<author>Corets, Eva</author>
<price>5.95</price>
</book>
<book genre="update李赞红" ISBN="2-3631-4">
<title>CS从入门到精通</title>
<author>亚胜</author>
<price>58.3</price>
</book>
</bookstore>

3、删除 <book genre="fantasy" ISBN="2-3631-4">节点的genre属性，删除 <book genre="update李赞红" ISBN="2-3631-4">节点。
XmlNodeList xnl=xmlDoc.SelectSingleNode("bookstore").ChildNodes;

foreach(XmlNode xn in xnl)
{
XmlElement xe=(XmlElement)xn;
if(xe.GetAttribute("genre")=="fantasy")
{
xe.RemoveAttribute("genre");//删除genre属性
}
else if(xe.GetAttribute("genre")=="update李赞红")
{
xe.RemoveAll();//删除该节点的全部内容
}
}
xmlDoc.Save("bookstore.xml");
//===========================================
最后结果为：
<?xml version="1.0" encoding="gb2312"?>
<bookstore>
<book ISBN="2-3631-4">
<title>Oberon's Legacy</title>
<author>Corets, Eva</author>
<price>5.95</price>
</book>
<book>
</book>
</bookstore>

4、显示所有数据。
XmlNode xn=xmlDoc.SelectSingleNode("bookstore");

XmlNodeList xnl=xn.ChildNodes;

foreach(XmlNode xnf in xnl)
{
XmlElement xe=(XmlElement)xnf;
Console.WriteLine(xe.GetAttribute("genre"));//显示属性值
Console.WriteLine(xe.GetAttribute("ISBN"));

XmlNodeList xnf1=xe.ChildNodes;
foreach(XmlNode xn2 in xnf1)
{
Console.WriteLine(xn2.InnerText);//显示子节点点文本
}
}

-----------------------------------------------------------------------------------------
2010.09.19增加的内容

<?xml version="1.0" encoding="utf-8"?>
<D3DVersion>
<Version_Display>1</Version_Display>
</D3DVersion>

读XML文件

//version XML
string strLocdir = System.AppDomain.CurrentDomain.BaseDirectory;
string strVersion = "Sony 2D/3D Converter Software" + "/r/n" + "MPES-2D3D1";
strVersion += "/r/n";
strVersion += "/r/n";
strVersion += "Version: 1.00";

string verXmlPath = strLocdir + "2D3DVersion.xml";
string strRC1Flag = "0";
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(verXmlPath);
XmlNode xn = xmlDoc.SelectSingleNode("D3DVersion");
XmlNodeList xnl = xn.ChildNodes;
foreach (XmlNode xnf in xnl)
{
XmlElement xe = (XmlElement)xnf;
//Console.WriteLine(xe.GetAttribute("Version_Display"));//显示属性值
XmlNodeList xnf1 = xe.ChildNodes;
foreach (XmlNode xn2 in xnf1)
{
strRC1Flag = xn2.InnerText;
}
}

写文件

//verXMLファイルのパス
string verXmlPath = strLocdir + "2D3DVersion.xml";
XmlTextWriter textWriter = new XmlTextWriter(verXmlPath, Encoding.UTF8);
textWriter.Formatting = Formatting.Indented;
// 开始写过程，调用WriteStartDocument方法
textWriter.WriteStartDocument();
// 写入说明
//textWriter.WriteComment("First Comment XmlTextWriter Sample Example");
//textWriter.WriteComment("w3sky.xml in root dir");
//创建一个节点
textWriter.WriteStartElement("2D3DVersion");
textWriter.WriteElementString("Version_Display", "0");
textWriter.WriteEndElement();
// 写文档结束，调用WriteEndDocument方法
textWriter.WriteEndDocument();
// 关闭textWriter
textWriter.Close();

==================================================================================
用序列化的方法,读写XML文件
<?xml version="1.0" encoding="utf-8"?>
<KSBMCONFIG xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<ConnectString>ConnectString1</ConnectString>
<ServerPath>ServerPath1</ServerPath>
<SMTPServer>SMTPServer1</SMTPServer>
</KSBMCONFIG>

建造一个类,包含XML数据结构的类:

public class KSBMCONFIG
{
/// <summary>
///
/// </summary>
public KSBMCONFIG()
{
}

private string _ConnectString;
/// <summary>
/// ConnectString.
/// </summary>
public string ConnectString
{
get { return _ConnectString; }
set { _ConnectString = value; }
}

private string _ServerPath;
/// <summary>
/// ServerPath.
/// </summary>
public string ServerPath
{
get { return _ServerPath; }
set { _ServerPath = value; }
}

private string _SMTPServer;
/// <summary>
/// SMTP.
/// </summary>
public string SMTPServer
{
get { return _SMTPServer; }
set { _SMTPServer = value; }
}
/// <summary>
/// 初期化
/// </summary>
public void Init()
{
_ConnectString = "";
_ServerPath = "";
_SMTPServer = "";
}
}

按钮按下时,进行读写XML文件,(注意需要引入的包)

private void button1_Click(object sender, EventArgs e)
{
string aPath = System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().Location);
aPath = System.IO.Path.Combine(aPath, "1.xml");

//读入
KSBMCONFIG setting = LoadFromXML(aPath);

setting.ConnectString = "ConnectString123";
setting.ServerPath = "ServerPath123";
setting.SMTPServer = "SMTPServer123";

//写入
bool b = SaveToXML(aPath, typeof(KSBMCONFIG), setting);
}

public static KSBMCONFIG LoadFromXML(string fileName)
{
KSBMCONFIG aSetting = null;
System.IO.FileStream fs = null;

try
{
System.Xml.Serialization.XmlSerializer serializer
= new System.Xml.Serialization.XmlSerializer(typeof(KSBMCONFIG));
fs = new System.IO.FileStream(fileName, System.IO.FileMode.Open);
aSetting = (KSBMCONFIG)serializer.Deserialize(fs);
}
catch (System.Exception ex)
{
Console.WriteLine(ex.ToString());
}
finally
{
if (fs != null)
{
fs.Close();
}
}

return aSetting;
}

public static bool SaveToXML(string fileName, System.Type type, object target)
{
System.Xml.Serialization.XmlSerializer serializer = null;
System.IO.StreamWriter writer = null;
bool isSaved = false;

try
{
writer = new System.IO.StreamWriter(fileName, false);
serializer = new System.Xml.Serialization.XmlSerializer(type);
serializer.Serialize(writer, target);
isSaved = true;
}
catch (System.Exception ex)
{
Console.WriteLine(ex.ToString());
}
finally
{
if (writer != null)
{
writer.Close();
}
}

return isSaved;
}