using
System.Xml;
node
//初始化一個xml實例
XmlDocument xml=
new
XmlDocument();
//導入指定xml文件
xml.Load(path);
xml.Load(HttpContext.Current.Server.MapPath(
"~/file/bookstore.xml"
));
//指定一個節點
XmlNode root=xml.SelectSingleNode(
"/root"
);
//獲取節點下全部直接子節點
XmlNodeList childlist=root.ChildNodes;
//判斷該節點下是否有子節點
root.HasChildNodes;
//獲取同名同級節點集合
XmlNodeList nodelist=xml.SelectNodes(
"/Root/News"
);
//生成一個新節點
XmlElement node=xml.CreateElement(
"News"
);
//將節點加到指定節點下,做爲其子節點
root.AppendChild(node);
//將節點加到指定節點下某個子節點前
root.InsertBefore(node,root.ChildeNodes[i]);
//爲指定節點的新建屬性並賦值
node.SetAttribute(
"id"
,
"11111"
);
//爲指定節點添加子節點
root.AppendChild(node);
//獲取指定節點的指定屬性值
string
id=node.Attributes[
"id"
].Value;
//獲取指定節點中的文本
string
content=node.InnerText;
//保存XML文件
string
path=Server.MapPath(
"~/file/bookstore.xml"
);
xml.Save(path);
//or use :xml.Save(HttpContext.Current.Server.MapPath("~/file/bookstore.xml"));
2、具體實例
在C#.net中如何操做XML
須要添加的命名空間:
using
System.Xml;
定義幾個公共對象:
XmlDocument xmldoc ;
XmlNode xmlnode ;
XmlElement xmlelem ;
1,建立到服務器同名目錄下的xml文件:
方法一:
xmldoc =
new
XmlDocument ( ) ;
//加入XML的聲明段落,<?xml version="1.0" encoding="gb2312"?>
XmlDeclaration xmldecl;
xmldecl = xmldoc.CreateXmlDeclaration(
"1.0"
,
"gb2312"
,
null
);
xmldoc.AppendChild ( xmldecl);
//加入一個根元素
xmlelem = xmldoc.CreateElement (
""
,
"Employees"
,
""
) ;
xmldoc.AppendChild ( xmlelem ) ;
//加入另一個元素
for
(
int
i=1;i<3;i++)
{
XmlNode root=xmldoc.SelectSingleNode(
"Employees"
);
//查找<Employees>
XmlElement xe1=xmldoc.CreateElement(
"Node"
);
//建立一個<Node>節點
xe1.SetAttribute(
"genre"
,
"李贊紅"
);
//設置該節點genre屬性
xe1.SetAttribute(
"ISBN"
,
"2-3631-4"
);
//設置該節點ISBN屬性
XmlElement xesub1=xmldoc.CreateElement(
"title"
);
xesub1.InnerText=
"CS從入門到精通"
;
//設置文本節點
xe1.AppendChild(xesub1);
//添加到<Node>節點中
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<Employees>節點中
}
//保存建立好的XML文檔
xmldoc.Save ( Server.MapPath(
"data.xml"
) ) ;
//////////////////////////////////////////////////////////////////////////////////////
結果:在同名目錄下生成了名爲data.xml的文件,內容以下,
<?xml version=
"1.0"
encoding=
"gb2312"
?>
<Employees>
<Node genre=
"李贊紅"
ISBN=
"2-3631-4"
>
<title>CS從入門到精通</title>
<author>候捷</author>
<price>58.3</price>
</Node>
<Node genre=
"李贊紅"
ISBN=
"2-3631-4"
>
<title>CS從入門到精通</title>
<author>候捷</author>
<price>58.3</price>
</Node>
</Employees>
方法二:
XmlTextWriter xmlWriter;
string
strFilename = Server.MapPath(
"data1.xml"
) ;
xmlWriter =
new
XmlTextWriter(strFilename,Encoding.Default);
//建立一個xml文檔
xmlWriter.Formatting = Formatting.Indented;
xmlWriter.WriteStartDocument();
xmlWriter.WriteStartElement(
"Employees"
);
xmlWriter.WriteStartElement(
"Node"
);
xmlWriter.WriteAttributeString(
"genre"
,
"李贊紅"
);
xmlWriter.WriteAttributeString(
"ISBN"
,
"2-3631-4"
);
xmlWriter.WriteStartElement(
"title"
);
xmlWriter.WriteString(
"CS從入門到精通"
);
xmlWriter.WriteEndElement();
xmlWriter.WriteStartElement(
"author"
);
xmlWriter.WriteString(
"候捷"
);
xmlWriter.WriteEndElement();
xmlWriter.WriteStartElement(
"price"
);
xmlWriter.WriteString(
"58.3"
);
xmlWriter.WriteEndElement();
xmlWriter.WriteEndElement();
xmlWriter.Close();
//////////////////////////////////////////////////////////////////////////////////////
結果:
<?xml version=
"1.0"
encoding=
"gb2312"
?>
<Employees>
<Node genre=
"李贊紅"
ISBN=
"2-3631-4"
>
<title>CS從入門到精通</title>
<author>候捷</author>
<price>58.3</price>
</Node>
</Employees>
2,添加一個結點:
XmlDocument xmlDoc=
new
XmlDocument();
xmlDoc.Load(Server.MapPath(
"data.xml"
));
XmlNode root=xmlDoc.SelectSingleNode(
"Employees"
);
//查找<Employees>
XmlElement xe1=xmlDoc.CreateElement(
"Node"
);
//建立一個<Node>節點
xe1.SetAttribute(
"genre"
,
"張三"
);
//設置該節點genre屬性
xe1.SetAttribute(
"ISBN"
,
"1-1111-1"
);
//設置該節點ISBN屬性
XmlElement xesub1=xmlDoc.CreateElement(
"title"
);
xesub1.InnerText=
"C#入門幫助"
;
//設置文本節點
xe1.AppendChild(xesub1);
//添加到<Node>節點中
XmlElement xesub2=xmlDoc.CreateElement(
"author"
);
xesub2.InnerText=
"高手"
;
xe1.AppendChild(xesub2);
XmlElement xesub3=xmlDoc.CreateElement(
"price"
);
xesub3.InnerText=
"158.3"
;
xe1.AppendChild(xesub3);
root.AppendChild(xe1);
//添加到<Employees>節點中
xmlDoc.Save ( Server.MapPath(
"data.xml"
) );
//////////////////////////////////////////////////////////////////////////////////////
結果:在xml原有的內容裏添加了一個結點,內容以下,
<?xml version=
"1.0"
encoding=
"gb2312"
?>
<Employees>
<Node genre=
"李贊紅"
ISBN=
"2-3631-4"
>
<title>CS從入門到精通</title>
<author>候捷</author>
<price>58.3</price>
</Node>
<Node genre=
"李贊紅"
ISBN=
"2-3631-4"
>
<title>CS從入門到精通</title>
<author>候捷</author>
<price>58.3</price>
</Node>
<Node genre=
"張三"
ISBN=
"1-1111-1"
>
<title>C#入門幫助</title>
<author>高手</author>
<price>158.3</price>
</Node>
</Employees>
3,修改結點的值(屬性和子結點):
XmlDocument xmlDoc=
new
XmlDocument();
xmlDoc.Load( Server.MapPath(
"data.xml"
) );
XmlNodeList nodeList=xmlDoc.SelectSingleNode(
"Employees"
).ChildNodes;
//獲取Employees節點的全部子節點
foreach
(XmlNode xn
in
nodeList)
//遍歷全部子節點
{
XmlElement xe=(XmlElement)xn;
//將子節點類型轉換爲XmlElement類型
if
(xe.GetAttribute(
"genre"
)==
"張三"
)
//若是genre屬性值爲「張三」
{
xe.SetAttribute(
"genre"
,
"update張三"
);
//則修改該屬性爲「update張三」
XmlNodeList nls=xe.ChildNodes;
//繼續獲取xe子節點的全部子節點
foreach
(XmlNode xn1
in
nls)
//遍歷
{
XmlElement xe2=(XmlElement)xn1;
//轉換類型
if
(xe2.Name==
"author"
)
//若是找到
{
xe2.InnerText=
"亞勝"
;
//則修改
}
}
}
}
xmlDoc.Save( Server.MapPath(
"data.xml"
) );
//保存。
//////////////////////////////////////////////////////////////////////////////////////
結果:將原來的全部結點的信息都修改了,xml的內容以下,
<?xml version=
"1.0"
encoding=
"gb2312"
?>
<Employees>
<Node genre=
"李贊紅"
ISBN=
"2-3631-4"
>
<title>CS從入門到精通</title>
<author>候捷</author>
<price>58.3</price>
</Node>
<Node genre=
"李贊紅"
ISBN=
"2-3631-4"
>
<title>CS從入門到精通</title>
<author>候捷</author>
<price>58.3</price>
</Node>
<Node genre=
"update張三"
ISBN=
"1-1111-1"
>
<title>C#入門幫助</title>
<author>亞勝</author>
<price>158.3</price>
</Node>
</Employees>
4,修改結點(添加結點的屬性和添加結點的自結點):
XmlDocument xmlDoc=
new
XmlDocument();
xmlDoc.Load( Server.MapPath(
"data.xml"
) );
XmlNodeList nodeList=xmlDoc.SelectSingleNode(
"Employees"
).ChildNodes;
//獲取Employees節點的全部子節點
foreach
(XmlNode xn
in
nodeList)
{
XmlElement xe=(XmlElement)xn;
xe.SetAttribute(
"test"
,
"111111"
);
XmlElement xesub=xmlDoc.CreateElement(
"flag"
);
xesub.InnerText=
"1"
;
xe.AppendChild(xesub);
}
xmlDoc.Save( Server.MapPath(
"data.xml"
) );
//////////////////////////////////////////////////////////////////////////////////////
結果:每一個結點的屬性都添加了一個,子結點也添加了一個,內容以下,
<?xml version=
"1.0"
encoding=
"gb2312"
?>
<Employees>
<Node genre=
"李贊紅"
ISBN=
"2-3631-4"
test=
"111111"
>
<title>CS從入門到精通</title>
<author>候捷</author>
<price>58.3</price>
<flag>1</flag>
</Node>
<Node genre=
"李贊紅"
ISBN=
"2-3631-4"
test=
"111111"
>
<title>CS從入門到精通</title>
<author>候捷</author>
<price>58.3</price>
<flag>1</flag>
</Node>
<Node genre=
"update張三"
ISBN=
"1-1111-1"
test=
"111111"
>
<title>C#入門幫助</title>
<author>亞勝</author>
<price>158.3</price>
<flag>1</flag>
</Node>
</Employees>
5,刪除結點中的某一個屬性:
XmlDocument xmlDoc=
new
XmlDocument();
xmlDoc.Load( Server.MapPath(
"data.xml"
) );
XmlNodeList xnl=xmlDoc.SelectSingleNode(
"Employees"
).ChildNodes;
foreach
(XmlNode xn
in
xnl)
{
XmlElement xe=(XmlElement)xn;
xe.RemoveAttribute(
"genre"
);
//刪除genre屬性
XmlNodeList nls=xe.ChildNodes;
//繼續獲取xe子節點的全部子節點
foreach
(XmlNode xn1
in
nls)
//遍歷
{
XmlElement xe2=(XmlElement)xn1;
//轉換類型
if
(xe2.Name==
"flag"
)
//若是找到
{
xe.RemoveChild(xe2);
//則刪除
}
}
}
xmlDoc.Save( Server.MapPath(
"data.xml"
) );
//////////////////////////////////////////////////////////////////////////////////////]
結果:刪除告終點的一個屬性和結點的一個子結點,內容以下,
<?xml version=
"1.0"
encoding=
"gb2312"
?>
<Employees>
<Node ISBN=
"2-3631-4"
test=
"111111"
>
<title>CS從入門到精通</title>
<author>候捷</author>
<price>58.3</price>
</Node>
<Node ISBN=
"2-3631-4"
test=
"111111"
>
<title>CS從入門到精通</title>
<author>候捷</author>
<price>58.3</price>
</Node>
<Node ISBN=
"1-1111-1"
test=
"111111"
>
<title>C#入門幫助</title>
<author>亞勝</author>
<price>158.3</price>
</Node>
</Employees>
6,刪除結點:
XmlDocument xmlDoc=
new
XmlDocument();
xmlDoc.Load( Server.MapPath(
"data.xml"
) );
XmlNode root=xmlDoc.SelectSingleNode(
"Employees"
);
XmlNodeList xnl=xmlDoc.SelectSingleNode(
"Employees"
).ChildNodes;
for
(
int
i=0;i<xnl.Count;i++)
{
XmlElement xe=(XmlElement)xnl.Item(i);
if
(xe.GetAttribute(
"genre"
)==
"張三"
)
{
root.RemoveChild(xe);
if
(i<xnl.Count)i=i-1;
}
}
xmlDoc.Save( Server.MapPath(
"data.xml"
) );
//////////////////////////////////////////////////////////////////////////////////////]
結果:刪除了符合條件的全部結點,原來的內容:
<?xml version=
"1.0"
encoding=
"gb2312"
?>
<Employees>
<Node genre=
"李贊紅"
ISBN=
"2-3631-4"
>
<title>CS從入門到精通</title>
<author>候捷</author>
<price>58.3</price>
</Node>
<Node genre=
"李贊紅"
ISBN=
"2-3631-4"
>
<title>CS從入門到精通</title>
<author>候捷</author>
<price>58.3</price>
</Node>
<Node genre=
"張三"
ISBN=
"1-1111-1"
>
<title>C#入門幫助</title>
<author>高手</author>
<price>158.3</price>
</Node>
<Node genre=
"張三"
ISBN=
"1-1111-1"
>
<title>C#入門幫助</title>
<author>高手</author>
<price>158.3</price>
</Node>
</Employees>
刪除後的內容:
<?xml version=
"1.0"
encoding=
"gb2312"
?>
<Employees>
<Node genre=
"李贊紅"
ISBN=
"2-3631-4"
>
<title>CS從入門到精通</title>
<author>候捷</author>
<price>58.3</price>
</Node>
<Node genre=
"李贊紅"
ISBN=
"2-3631-4"
>
<title>CS從入門到精通</title>
<author>候捷</author>
<price>58.3</price>
</Node>
</Employees>
7,按照文本文件讀取xml
System.IO.StreamReader myFile =
new
System.IO.StreamReader(Server.MapPath(
"data.xml"
),System.Text.Encoding.Default);
//注意System.Text.Encoding.Default
string
myString = myFile.ReadToEnd();
//myString是讀出的字符串
myFile.Close();
3、高級應用
/*讀取xml數據 兩種xml方式*/
<aaa>
<bb>something</bb>
<cc>something</cc>
</aaa>
<aaa>
<add key=
"123"
value=
"321"
/>
</aaa>
/*第一種方法*/
DS.ReadXml(
"your xmlfile name"
);
Container.DataItem(
"bb"
);
Container.DataItem(
"cc"
);
DS.ReadXmlSchema(
"your xmlfile name"
);
/*第二種方法*/
<aaa>
<add key=
"123"
value=
"321"
/>
</aaa>
若是我要找到123而後取到321應該怎麼寫呢?
using
System.XML;
XmlDataDocument xmlDoc =
new
System.Xml.XmlDataDocument();
xmlDoc.Load(
@"c:/Config.xml"
);
XmlElement elem = xmlDoc.GetElementById(
"add"
);
string
str = elem.Attributes[
"value"
].Value
/*第三種方法: SelectSingleNode 讀取兩種格式的xml *---/
--------------------------------------------------------------------
<?xml version=
"1.0"
encoding=
"utf-8"
?>
<configuration>
<appSettings>
<ConnectionString>Data Source=yf; user id=ctm_dbo;password=123</ConnectionString>
</appSettings>
</configuration>
--------------------------------------------------------------------------
XmlDocument doc =
new
XmlDocument();
doc.Load(strXmlName);
XmlNode node=doc.SelectSingleNode(
"/configuration/appSettings/ConnectionString"
);
if
(node!=
null
)
{
string
k1=node.Value;
//null
string
k2=node.InnerText;
//Data Source=yf; user id=ctm_dbo;password=123
string
k3=node.InnerXml;
//Data Source=yf; user id=ctm_dbo;password=123
node=
null
;
}
********************************************************************
<?xml version=
"1.0"
encoding=
"utf-8"
?>
<configuration>
<appSettings>
<add key=
"ConnectionString"
value=
"Data Source=yf; user id=ctm_dbo;password=123"
/>
</appSettings>
</configuration>
**--------------------------------------------------------------------**
XmlNode node=doc.SelectSingleNode(
"/configuration/appSettings/add"
);
if
(node!=
null
)
{
string
k=node.Attributes[
"key"
].Value;
string
v=node.Attributes[
"value"
].Value;
node=
null
;
}
*--------------------------------------------------------------------*
XmlNode node=doc.SelectSingleNode(
"/configuration/appSettings/add"
);
if
(node!=
null
)
{
XmlNodeReader nr=
new
XmlNodeReader(node);
nr.MoveToContent();
//檢查當前節點是不是內容節點。若是此節點不是內容節點,則讀取器向前跳至下一個內容節點或文件結尾。
nr.MoveToAttribute(
"value"
);
string
s=nr.Value;
node=
null
;
}