c#中如何按条件读出xml文件内容

1如果是楼主用VS2008，C#30的话。。可以用LINQ

2下面是VS2005的代码

DataSet ds = new DataSet();

//用Dataset读XML的内容

dsReadXml(ServerMapPath("XMLFilexml"));

//科的表

DataTable dt = dsTables["Departments"];

//第二行记录

string str1 = dtRows[1]["Caption"]ToString();

string str2 = dtRows[1]["DiagramFileName"]ToString();

string str3 = dtRows[1]["DiscriptionFileName"]ToString();

有不明白请留言

C#

读取XML文件在5个步骤

//1、创建XmlDocument对象

XmlDocument

xmlDoc

=

new

XmlDocument();

//2、加载源文件

xmlDocLoad("文件名xml");

//3、获取根结点

XmlElement

xmlRoot

=

xmlDocDocumentElement;

//4、获取根结点下的子节点

foreach

(XmlNode

node

in

xmlRootChildNodes)

{

//5、获取子节点对应的内容

string

name

=

node["name"]InnerText;

}

1、

XmlNodeList grouplist =xmlDocSelectSingleNode("SysStruct")ChildNodes;

foreach (XmlNode xng in grouplist)

{

XmlElement xeg = (XmlElement)xng;

string id=xegGetAttribute("id");

string value=xegGetAttribute("value");

string version=xegGetAttribute("version");

string description=xegGetAttribute("description");

}

2、xmlnodelist和xmlnode的区别:xmlnode是一个节点，而xmlnodelist节点的集合列表

3、所有类型的节点都带有selectNodes方法，该方法的唯一参数是XSL的模式规则，返回值是匹配该规则的结果集合。如：rootNodeselectNodes(“//book[price < 10]”) 。而节点中的selectSingleNodes方法的用法与selectNodes是一样的，只是返回结果为查找到的满足条件的第一个节点而已。

下面是我写的生成XML文件的例子，主要是用递归来完成嵌套的XML生成。

生成的格式为：

<Datas>

<Data>

<year>

</year>

<paper>

<name> </name>

<number></number>

<weight></weight>

<paper>

</paper>

</paper>

</Data>

</Datas>

#include <fstream>

#include <iostream>

#include <string>

#include <ctime>

#include <cstdlib>

using namespace std;

const int MAX_YEAR = 6;

const int MAX_NODENAME = 8;

const int MAX_DEPTH = 1;

const int MAX_ITEM = 15;

const int MAX_TAGS = 50;

enum NodeName

{

DATAS,

DATA,

YEAR,

PAPERS,

NUMBER,

WEIGHT,

TAG,

NAME

};

string NodeBegin[MAX_NODENAME] = {"<Datas>", "<Data>", "<year>", "<paper>", "<number>", "<weight>", "<tag>", "<name>"};

string NodeEnd[MAX_NODENAME] = {"</Datas>", "</Data>", "</year>", "</paper>", "</number>", "</weight>", "</tag>", "</name>"};

string Years[MAX_YEAR] = {"2000","2001","2002","2003","2004","2005"};

//_T的意思是通知编译器，自行进行字符串的多字节/Unicode转换。

//而L表示，该字符串为Unicode版本。

ofstream outfile(L"首页xml");

int Random(int i)

{

return (rand()%i+1);

}

void Recursive(int level, string parentName, string year)

{

if (level == 1)

{

for (int i = 0; i < MAX_ITEM; i++)

{

outfile<<NodeBegin[PAPERS]<<endl;

outfile<<NodeBegin[NAME]<<parentName<<"-"<<i<<NodeEnd[NAME]<<endl;

outfile<<NodeBegin[NUMBER]<<Random(10)<<NodeEnd[NUMBER]<<endl;

outfile<<NodeBegin[WEIGHT]<<Random(10)<<NodeEnd[WEIGHT]<<endl;

outfile<<NodeEnd[PAPERS]<<endl;

}

for (int j =0; j < MAX_TAGS; j++)

{

outfile<<NodeBegin[TAG]<<endl;

outfile<<NodeBegin[NAME]<<year<<":"<<parentName<<"-"<<j<<NodeEnd[NAME]<<endl;

outfile<<NodeBegin[WEIGHT]<<Random(10)<<NodeEnd[WEIGHT]<<endl;

outfile<<NodeEnd[TAG]<<endl;

}

}

else

{

for (int i = 0; i < MAX_ITEM; i++)

{

char a[10];

string str;

itoa(i, a, 10);

str = a;

string curName = parentName+"-"+str;

outfile<<NodeBegin[PAPERS]<<endl;

outfile<<NodeBegin[NAME]<<curName<<NodeEnd[NAME]<<endl;

outfile<<NodeBegin[NUMBER]<<Random(10)<<NodeEnd[NUMBER]<<endl;

outfile<<NodeBegin[WEIGHT]<<Random(10)<<NodeEnd[WEIGHT]<<endl;

Recursive(level-1, curName, year);

outfile<<NodeEnd[PAPERS]<<endl;

}

for (int j =0; j < MAX_TAGS; j++)

{

outfile<<NodeBegin[TAG]<<endl;

outfile<<NodeBegin[NAME]<<"Tag"<<year<<":"<<parentName<<"-"<<j<<NodeEnd[NAME]<<endl;

outfile<<NodeBegin[WEIGHT]<<Random(10)<<NodeEnd[WEIGHT]<<endl;

outfile<<NodeEnd[TAG]<<endl;

}

}

}

void GenerateXML()

{

outfile<<NodeBegin[DATAS]<<endl;

for (int i = 0; i < MAX_YEAR; i++ )

{

outfile<<NodeBegin[DATA]<<endl;

outfile<<NodeBegin[YEAR]<<Years[i]<<NodeEnd[YEAR]<<endl;

Recursive(MAX_DEPTH, "学科主题",Years[i]);

outfile<<NodeEnd[DATA]<<endl;

}

outfile<<NodeEnd[DATAS]<<endl;

}

void main()

{

locale::global(locale(""));

srand(time(NULL));

if (!outfile)

{

cout<<"can't open output file"<<endl;

}

GenerateXML();

cout<<"Generate End"<<endl;

}

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