ASP.NET技巧：请求网址并解析返回的html_[Asp.Net教程]

目的，把远程服务器传回的Html，解析到类里面，为GridView等提供数据源

　　1 、向远程服务器Post数据

public int PostData(string url, string data, out string info)
{
info = "";
CookieContainer cc = new CookieContainer();
HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
request.CookieContainer = cc;
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
Stream requestStream = request.GetRequestStream();
byte[] byteArray = Encoding.UTF8.GetBytes(data);
requestStream.Write(byteArray, 0, byteArray.Length);
requestStream.Close();
HttpWebResponse response = request.GetResponse() as HttpWebResponse;
Uri responseUri = response.ResponseUri;
Stream receiveStream = response.GetResponseStream();
Encoding encode = System.Text.Encoding.GetEncoding("utf-8");
StreamReader readStream = new StreamReader(receiveStream, encode);
string result = readStream.ReadToEnd();
info = result;
return 0;
}

　　2、解析返回的html，有省略

public ClassInfo[] GetClass(string html)
{
ArrayList ar = new ArrayList();
ArrayList arr = new ArrayList();
string table = "";
Regex regtable = new Regex(@"(?<=
).*?(?=
)", RegexOptions.Singleline);
Match ma = regtable.Match(html);
while (ma.Success)
{
if (ma.Value.Trim() != "")
{
arr.Add(HttpUtility.HtmlDecode(ma.Value));
}
ma = ma.NextMatch();
}
for (int i = 0; i < arr.Count; i++)
{
table = arr[i].ToString() + table;
}
Regex reg = new Regex(@"(?<=<.*?>).*?(?=<.*?>)", RegexOptions.Singleline);
Match m = reg.Match(table);
while (m.Success)
{
if (m.Value.Trim() != "")
{
ar.Add(HttpUtility.HtmlDecode(m.Value));
}
m = m.NextMatch();
}
ClassInfo[] ci = new ClassInfo[classno];
for (int i = 0; i < classno; i++)
{
ci[i] = new ClassInfo();
ci[i].RegisterDate = (ar[i * 8 + 0]).ToString();
ci[i].LoginDate = (ar[i * 8 + 1]).ToString();
ci[i].LogoutDate = (ar[i * 8 + 2]).ToString();
ci[i].UseMin = ar[i * 8 + 3].ToString();
ci[i].ClassName = ar[i * 8 + 5].ToString();
ci[i].ClassType = ar[i * 8 + 6].ToString();
ci[i].Percent = ar[i * 8 + 7].ToString();
}
return ci;
}

　　3、定义ClassInfo类（课程类），用CodeSmith生成

public class ClassInfo
{
Member Variables#region Member Variables
protected string _loginDate;
protected string _logoutDate;
protected string _registerDate;
protected string _useMin;
protected string _className;
protected string _classType;
protected string _percent;
//protected string _nouse;
#endregion
Constructors#region Constructors
public ClassInfo() { }
public ClassInfo(string loginDate, string logoutDate, string registerDate, string useMin, string className, string classType, string percent)
{
this._loginDate = loginDate;
this._logoutDate = logoutDate;
this._registerDate = registerDate;
this._useMin = useMin;
this._className = className;
this._classType = classType;
this._percent = percent;
}
#endregion
Public Properties#region Public Properties
// public string NoUse
// {
// get{return _nouse;}
// set{ _nouse= value;}
// }
public string LoginDate
{
get { return _loginDate; }
set { _loginDate = value; }
}
public string LogoutDate
{
get { return _logoutDate; }
set { _logoutDate = value; }
}
public string RegisterDate
{
get { return _registerDate; }
set { _registerDate = value; }
}
public string UseMin
{
get { return _useMin; }
set { _useMin = value; }
}
public string ClassName
{
get { return _className; }
set
{
if (value != null && value.Length > 50)
throw new ArgumentOutOfRangeException("Invalid value for ClassName", value, value.ToString());
_className = value;
}
}
public string ClassType
{
get { return _classType; }
set
{
if (value != null && value.Length > 50)
throw new ArgumentOutOfRangeException("Invalid value for ClassType", value, value.ToString());
_classType = value;
}
}
public string Percent
{
get { return _percent; }
set
{
if (value != null && value.Length > 50)
throw new ArgumentOutOfRangeException("Invalid value for Percent", value, value.ToString());
_percent = value;
}
}
#endregion
}

来源:网络