以下代码报错:错误:长度不能小于 0。
参数名: length
哪里错了啊?
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Net;
using System.IO;
using System.Data.SqlClient;
using System.Text.RegularExpressions; namespace WindowsApplication2
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
} private void button1_Click(object sender, EventArgs e)
{
string strResult = "";
try
{
string Url = "http://list.mp3.baidu.com/topso/mp3topsong.html?id=1#top2"; HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);
//声明一个HttpWebRequest请求
request.Timeout = 30000;
//设置连接超时时间
request.Headers.Set("Pragma", "no-cache");
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
Stream streamReceive = response.GetResponseStream();
Encoding encoding = Encoding.GetEncoding("GB2312");
StreamReader streamReader = new StreamReader(streamReceive, encoding);
strResult = streamReader.ReadToEnd();
//取出和数据有关的那段源码
int iBodyStart = strResult.IndexOf(" <body", 0);
int iStart = strResult.IndexOf("歌曲TOP500", iBodyStart);
int iTableStart = strResult.IndexOf(" <table", iStart);
int iTableEnd = strResult.IndexOf(" </table>", iTableStart);
string strWeb = strResult.Substring(iTableStart, iTableEnd - iTableStart + 8); //生成HtmlDocument
WebBrowser webb = new WebBrowser();
webb.Navigate("about:blank");
HtmlDocument htmldoc = webb.Document.OpenNew(true);
htmldoc.Write(strWeb);
HtmlElementCollection htmlTR = htmldoc.GetElementsByTagName("TR");
foreach (HtmlElement tr in htmlTR)
{
string strID = tr.GetElementsByTagName("TD")[0].InnerText;
Console.WriteLine(tr.GetElementsByTagName("TD")[1].InnerText);
string strName = SplitName(tr.GetElementsByTagName("TD")[1].InnerText, "MusicName");
string strSinger = SplitName(tr.GetElementsByTagName("TD")[1].InnerText, "Singer");
strID = strID.Replace(".", "");
//插入DataTable
//AddLine(strID, strName, strSinger, "0"); string strID1 = tr.GetElementsByTagName("TD")[2].InnerText;
Console.WriteLine(tr.GetElementsByTagName("TD")[3].InnerText);
string strName1 = SplitName(tr.GetElementsByTagName("TD")[3].InnerText, "MusicName");
string strSinger1 = SplitName(tr.GetElementsByTagName("TD")[3].InnerText, "Singer");
//插入DataTable
strID1 = strID1.Replace(".", "");
//AddLine(strID1, strName1, strSinger1, "0"); string strID2 = tr.GetElementsByTagName("TD")[4].InnerText;
Console.WriteLine(tr.GetElementsByTagName("TD")[5].InnerText);
string strName2 = SplitName(tr.GetElementsByTagName("TD")[5].InnerText, "MusicName");
string strSinger2 = SplitName(tr.GetElementsByTagName("TD")[5].InnerText, "Singer");
//插入DataTable
strID2 = strID2.Replace(".", "");
//AddLine(strID2, strName2, strSinger2, "0"); }
}
catch (Exception exp)
{
strResult = "错误:" + exp.Message;
}
this.richTextBox1.Text = strResult; } public string SplitName(string longStrName, string name)
{
string result = "";
if (name.Equals("MusicName"))
{
result = longStrName.Substring(0, longStrName.IndexOf("(") - 1);
Console.WriteLine(result); }
else if (name.Equals("Singer"))
{
result = longStrName.Substring(longStrName.IndexOf("(") + 1).TrimEnd(new char[] { ')' });
Console.WriteLine(result); }
return result;
} }
}
参数名: length
哪里错了啊?
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Net;
using System.IO;
using System.Data.SqlClient;
using System.Text.RegularExpressions; namespace WindowsApplication2
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
} private void button1_Click(object sender, EventArgs e)
{
string strResult = "";
try
{
string Url = "http://list.mp3.baidu.com/topso/mp3topsong.html?id=1#top2"; HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);
//声明一个HttpWebRequest请求
request.Timeout = 30000;
//设置连接超时时间
request.Headers.Set("Pragma", "no-cache");
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
Stream streamReceive = response.GetResponseStream();
Encoding encoding = Encoding.GetEncoding("GB2312");
StreamReader streamReader = new StreamReader(streamReceive, encoding);
strResult = streamReader.ReadToEnd();
//取出和数据有关的那段源码
int iBodyStart = strResult.IndexOf(" <body", 0);
int iStart = strResult.IndexOf("歌曲TOP500", iBodyStart);
int iTableStart = strResult.IndexOf(" <table", iStart);
int iTableEnd = strResult.IndexOf(" </table>", iTableStart);
string strWeb = strResult.Substring(iTableStart, iTableEnd - iTableStart + 8); //生成HtmlDocument
WebBrowser webb = new WebBrowser();
webb.Navigate("about:blank");
HtmlDocument htmldoc = webb.Document.OpenNew(true);
htmldoc.Write(strWeb);
HtmlElementCollection htmlTR = htmldoc.GetElementsByTagName("TR");
foreach (HtmlElement tr in htmlTR)
{
string strID = tr.GetElementsByTagName("TD")[0].InnerText;
Console.WriteLine(tr.GetElementsByTagName("TD")[1].InnerText);
string strName = SplitName(tr.GetElementsByTagName("TD")[1].InnerText, "MusicName");
string strSinger = SplitName(tr.GetElementsByTagName("TD")[1].InnerText, "Singer");
strID = strID.Replace(".", "");
//插入DataTable
//AddLine(strID, strName, strSinger, "0"); string strID1 = tr.GetElementsByTagName("TD")[2].InnerText;
Console.WriteLine(tr.GetElementsByTagName("TD")[3].InnerText);
string strName1 = SplitName(tr.GetElementsByTagName("TD")[3].InnerText, "MusicName");
string strSinger1 = SplitName(tr.GetElementsByTagName("TD")[3].InnerText, "Singer");
//插入DataTable
strID1 = strID1.Replace(".", "");
//AddLine(strID1, strName1, strSinger1, "0"); string strID2 = tr.GetElementsByTagName("TD")[4].InnerText;
Console.WriteLine(tr.GetElementsByTagName("TD")[5].InnerText);
string strName2 = SplitName(tr.GetElementsByTagName("TD")[5].InnerText, "MusicName");
string strSinger2 = SplitName(tr.GetElementsByTagName("TD")[5].InnerText, "Singer");
//插入DataTable
strID2 = strID2.Replace(".", "");
//AddLine(strID2, strName2, strSinger2, "0"); }
}
catch (Exception exp)
{
strResult = "错误:" + exp.Message;
}
this.richTextBox1.Text = strResult; } public string SplitName(string longStrName, string name)
{
string result = "";
if (name.Equals("MusicName"))
{
result = longStrName.Substring(0, longStrName.IndexOf("(") - 1);
Console.WriteLine(result); }
else if (name.Equals("Singer"))
{
result = longStrName.Substring(longStrName.IndexOf("(") + 1).TrimEnd(new char[] { ')' });
Console.WriteLine(result); }
return result;
} }
}
这种都不判断?
iTableEnd - iTableStart + 8这个应该小于0了吧。你加个断点。