UI线程问题

[csdn_风中雪狼]

写了一个分析网址的程序，由于程序长时间去分析网址，所以呢导致窗体界面长时间没有反应，造成假死现象，请问各位高人，这种情况该怎么去处理。

[csdn_风中雪狼]

由于是刚注册的，
所以没有可用的分数
还请各位高人相助

[csdn_风中雪狼]

其代码如下：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.OleDb;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Text.RegularExpressions;
using System.IO;
using System.Net;

namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();

}
private string My_ConnStr = string.Empty;
private void button1_Click(object sender, EventArgs e)//开始按钮
{
DataSet dt;
dt = new DataSet();
dt =getUrl("select top 500 url from url where selectflag='1'");

Int32 li_Count = dt.Tables[0].Rows.Count;

for (Int32 li_i = 0; li_i < li_Count; li_i++)
{
getHtmlMess(dt.Tables[0].Rows[li_i][0].ToString().Trim());
}
dt.Dispose();
}

private void getHtmlMess(string ingurl)
{
string page = Gethtml(ingurl);

if (page.Length == 0)
{
return; //连接超时,就返回
}

Regex re = new Regex(@"href=(?<web_url>[\s\S]*?)>|href=""(?<web_url>[\s\S]*?)""|href='(?<web_url>[\s\S]*?)'");
MatchCollection mc = re.Matches(page);
foreach (Match m in mc)
{
string url = m.Groups["web_url"].ToString().Trim();

if ((url.IndexOf("'") == 0) || (url.IndexOf("\"") == 0))//去除头部的'与"
{
url = url.Remove(0, 1);
if (url.IndexOf("'") != -1)
{
url = url.Remove(url.IndexOf("'"), 1);
}
if (url.IndexOf("\"") != -1)
{
url = url.Remove(url.IndexOf("\""), 1);
}
}
if (url.IndexOf(" ") != -1)
{
url = url.Remove(url.IndexOf(" "));
}
if ((url.Length < 6) || (url.IndexOf("\"") > 0)) { continue; }

if ((url.Substring(url.Length - 4, 4).ToUpperInvariant() == ".JPG") || (url.Substring(url.Length - 4, 4).ToUpperInvariant() == ".GIF") || (url.Substring(url.Length - 4, 4).ToUpperInvariant() == ".CSS"))
{
continue;
}
if (url.IndexOf("blogs.ebay") > 0) { continue; }


if (url.IndexOf("http://") != -1)
{
listView1.Items.Add(url);
}
}
}


/// <summary>
///取得html代码
/// </summary>
/// <param name="url">指定的Url</param>
/// <returns>返回指定Url的Html</returns>
private string Gethtml(string url)
{
try
{
string html = string.Empty;
string encoding = string.Empty;
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
request.Method = "get";
request.ContentType = "text/html";
request.Timeout = 30 * 1000;
byte[] buffer = new byte[2048];
using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
{

using (Stream reader = response.GetResponseStream())
{
reader.ReadTimeout = 30 * 1000;
using (MemoryStream memory = new MemoryStream())
{
int index = 1;
int sum = 0;
while (index > 0 && sum < 100 * 2048)
{
index = reader.Read(buffer, 0, 2048);
if (index > 0)
{
memory.Write(buffer, 0, index);
sum += index;
}
}
html = Encoding.GetEncoding("utf-8").GetString(memory.ToArray());

if (string.IsNullOrEmpty(html))
{
return html;
}
else
{
Regex re = new Regex(@"charset=(?<charset>[\s\S]*?)[""|']");
Match m = re.Match(html.ToLower());
encoding = m.Groups["charset"].ToString();
}

if (string.IsNullOrEmpty(encoding) || string.Equals(encoding.ToLower(), "utf-8"))
{
return html;
}
else
{
return Encoding.GetEncoding(encoding).GetString(memory.ToArray());
}
}
}
}
}
catch
{
return "";
}
}

/// 执行传入的SQl语句，将查询结果通过数据集返回给调用者
/// </summary>
/// <sql>一条可执行的SQL</sql>
/// <returns>Dataset</returns>
private DataSet getUrl(string Sql)
{
OleDbConnection conn = new OleDbConnection();
DataSet myData = new DataSet();
try
{
conn.ConnectionString = My_ConnStr;
OleDbDataAdapter MyDataAd = new OleDbDataAdapter(Sql, conn);
MyDataAd.Fill(myData, "SpiderTable");
MyDataAd.Dispose();
}
catch (Exception err)
{
if (err.Message.ToString() == "[DBNETLIB][ConnectionOpen (Connect()).]SQL Server 不存在或拒绝访问。")
{
MessageBox.Show("数据库连接失败,本系统将终止执行,请确认数据库服务器是否开启!", "系统提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
Application.ExitThread();
Application.Exit();
conn.Dispose();
return myData;
}
}

finally
{
conn.Dispose();
}
return myData;
}

private void Form1_Load(object sender, EventArgs e)
{
My_ConnStr = textBox3.Text.ToString();
}
}
}

[csdn_风中雪狼]

using System; 
using System.Collections.Generic; 
using System.ComponentModel; 
using System.Data; 
using System.Data.OleDb; 
using System.Drawing; 
using System.Linq; 
using System.Text; 
using System.Windows.Forms; 
using System.Text.RegularExpressions; 
using System.IO; 
using System.Net; 

namespace WindowsFormsApplication1 
{ 
    public partial class Form1 : Form 
    { 
        public Form1() 
        { 
            InitializeComponent(); 
          
        } 
        private  string My_ConnStr = string.Empty; 
        private void button1_Click(object sender, EventArgs e)//开始按钮 
        { 
            DataSet dt; 
            dt = new DataSet(); 
            dt =getUrl("select top 500 url from url where selectflag='1'"); 

            Int32 li_Count = dt.Tables[0].Rows.Count; 
            
            for (Int32 li_i = 0; li_i < li_Count; li_i++) 
            { 
                getHtmlMess(dt.Tables[0].Rows[li_i][0].ToString().Trim()); 
            } 
            dt.Dispose(); 
        } 

        private void getHtmlMess(string ingurl) 
        { 
            string page = Gethtml(ingurl); 

            if (page.Length == 0) 
            { 
                return; //连接超时,就返回 
            } 

            Regex re = new Regex(@"href=(? <web_url>[\s\S]*?)>|href=""(? <web_url>[\s\S]*?)""|href='(? <web_url>[\s\S]*?)'"); 
            MatchCollection mc = re.Matches(page); 
            foreach (Match m in mc) 
            { 
                string url = m.Groups["web_url"].ToString().Trim(); 

                if ((url.IndexOf("'") == 0) || (url.IndexOf("\"") == 0))//去除头部的'与" 
                { 
                    url = url.Remove(0, 1); 
                    if (url.IndexOf("'") != -1) 
                    { 
                        url = url.Remove(url.IndexOf("'"), 1); 
                    } 
                    if (url.IndexOf("\"") != -1) 
                    { 
                        url = url.Remove(url.IndexOf("\""), 1); 
                    } 
                } 
                if (url.IndexOf(" ") != -1) 
                { 
                    url = url.Remove(url.IndexOf(" ")); 
                } 
                if ((url.Length < 6) || (url.IndexOf("\"") > 0)) { continue; } 
                
                if ((url.Substring(url.Length - 4, 4).ToUpperInvariant() == ".JPG") || (url.Substring(url.Length - 4, 4).ToUpperInvariant() == ".GIF") || (url.Substring(url.Length - 4, 4).ToUpperInvariant() == ".CSS")) 
                { 
                    continue; 
                } 
                if (url.IndexOf("blogs.ebay") > 0) { continue; } 

              
                if (url.IndexOf("http://") != -1) 
                { 
                  listView1.Items.Add(url); 
                } 
            } 
        } 

        
        /// <summary> 
        ///取得html代码 
        /// </summary> 
        /// <param name="url">指定的Url </param> 
        /// <returns>返回指定Url的Html </returns> 
        private string Gethtml(string url) 
        { 
            try 
            { 
                string html = string.Empty; 
                string encoding = string.Empty; 
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url); 
                request.Method = "get"; 
                request.ContentType = "text/html"; 
                request.Timeout = 30 * 1000; 
                byte[] buffer = new byte[2048]; 
                using (HttpWebResponse response = (HttpWebResponse)request.GetResponse()) 
                { 

                    using (Stream reader = response.GetResponseStream()) 
                    { 
                        reader.ReadTimeout = 30 * 1000; 
                        using (MemoryStream memory = new MemoryStream()) 
                        { 
                            int index = 1; 
                            int sum = 0; 
                            while (index > 0 && sum < 100 * 2048) 
                            { 
                                index = reader.Read(buffer, 0, 2048); 
                                if (index > 0) 
                                { 
                                    memory.Write(buffer, 0, index); 
                                    sum += index; 
                                } 
                            } 
                            html = Encoding.GetEncoding("utf-8").GetString(memory.ToArray()); 

                            if (string.IsNullOrEmpty(html)) 
                            { 
                                return html; 
                            } 
                            else 
                            { 
                                Regex re = new Regex(@"charset=(? <charset>[\s\S]*?)[""|']"); 
                                Match m = re.Match(html.ToLower()); 
                                encoding = m.Groups["charset"].ToString(); 
                            } 

                            if (string.IsNullOrEmpty(encoding) || string.Equals(encoding.ToLower(), "utf-8")) 
                            { 
                                return html; 
                            } 
                            else 
                            { 
                                return Encoding.GetEncoding(encoding).GetString(memory.ToArray()); 
                            } 
                        } 
                    } 
                } 
            } 
            catch 
            { 
                return ""; 
            } 
        } 

        /// 执行传入的SQl语句，将查询结果通过数据集返回给调用者 
        /// </summary> 
        /// <sql>一条可执行的SQL </sql> 
        /// <returns>Dataset </returns> 
        private DataSet getUrl(string Sql) 
        { 
            OleDbConnection conn = new OleDbConnection(); 
            DataSet myData = new DataSet(); 
            try 
            { 
                conn.ConnectionString = My_ConnStr; 
                OleDbDataAdapter MyDataAd = new OleDbDataAdapter(Sql, conn); 
                MyDataAd.Fill(myData, "SpiderTable"); 
                MyDataAd.Dispose(); 
            } 
            catch (Exception err) 
            { 
                if (err.Message.ToString() == "[DBNETLIB][ConnectionOpen (Connect()).]SQL Server 不存在或拒绝访问。") 
                { 
                    MessageBox.Show("数据库连接失败,本系统将终止执行,请确认数据库服务器是否开启!", "系统提示", MessageBoxButtons.OK, MessageBoxIcon.Information); 
                    Application.ExitThread(); 
                    Application.Exit(); 
                    conn.Dispose(); 
                    return myData; 
                } 
            } 

            finally 
            { 
                conn.Dispose(); 
            } 
            return myData; 
        } 

        private void Form1_Load(object sender, EventArgs e) 
        { 
            My_ConnStr = textBox3.Text.ToString(); 
        } 
    } 
}