c#winfrom 利用多线程插入数据 出现重复问题

        DataTable dt;
        BindingSource bs;
        private void Form1_Load(object sender, EventArgs e)
        {
            dt = new DataTable();
            dt.Columns.Add("id", typeof(string));
            dt.Columns.Add("aa", typeof(string));
            dt.Columns.Add("a", typeof(string));
            dt.Columns.Add("b", typeof(string));
            dt.Columns.Add("c", typeof(string));
            dt.Columns.Add("d", typeof(string));


            bs = new BindingSource();
            bs.DataSource = dt;
            this.dataGridView1.DataSource = bs;

        }
        string sturl;
        int ip = 10;
        private void button1_Click(object sender, EventArgs e)
        {
            //sturl = "http://127.0.0.1/MidasEvents1.htm";
            //GetWebContent();
            weburl wb;
            for (int i = 1; i <= 50; i++)
            {
                ip++;
                sturl = "http://127.0.0.1/MidasEvents" + i + ".htm";
                wb=new weburl(sturl, ip, dt);
            } 
 

        }

         class weburl
        {
            MatchCollection mc;
            DataRow dr;
            int t = 0;
            int sum = 0;
         string sturl;
         int ip;
         DataTable dt;
         public weburl(string stu,int p, DataTable ddt)
         {
             sturl = stu;
             ip = p;
             dt = ddt;
             //创建线程   
             Thread thread = new Thread(new ThreadStart(GetWebContent));   
             thread.Name = "Thread"+p.ToString();   
             thread.Start();
         }
        private void GetWebContent() 
        {
            t++;  
            try { 
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(sturl);
                //声明一个HttpWebRequest请求 
                //request.Timeout = 10000; 
                //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("utf-8"); 
                StreamReader streamReader = new StreamReader(streamReceive, encoding);
                mc = Regex.Matches(streamReader.ReadToEnd(), @"(?i)(?<=<font.*?>)[^<]+(?=</font>)");
                for (int i = 0; i < 4; i++)
                {
                     t++;
                    dr = dt.NewRow();
                    dr["id"] = t.ToString();
                    dr["aa"]="192.168.1."+ip.ToString();
                    dr["a"] = mc[sum++].Groups[0].Value.Trim().Replace("/n", "").ToString();
                    dr["b"] = mc[sum++].Groups[0].Value.Trim().Replace("/n", "").ToString();
                    dr["c"] = mc[sum++].Groups[0].Value.Trim().Replace("/n", "").ToString();
                    dr["d"] = mc[sum++].Groups[0].Value.Trim().Replace("/n", "").ToString();
                    dt.Rows.Add(dr);
                    
                }
                sum =0;
            } 
 
            catch (Exception ex)
            { 
                MessageBox.Show(ex.ToString());
            } 

        } 
         }

主要功能是 根据网页地址去读取网页，并获取一些内容，并保存到datatable

执行一个正常，用线程就报错了，数据不对头,
还有行方面不知道怎么优化


效果如下

编号 id 名称 类型 数值 报警
1 192.168.1.11 ah bb c4 d8
2 192.168.1.12 af bg c2 d7
3 192.168.1.13 as bh c1 d7




[解决办法]
MatchCollection mc;
DataRow dr;
int t = 0;
int sum = 0;
string sturl;
int ip;
DataTable dt;

这些变量在多个线程内共享，当然程序会出错。
[解决办法]
尤其是mc。a线程正要读呢，b线程改写了，自然取的重复了。

你这个程序根本不对，先找本书补充下基础知识再说吧。
[解决办法]
多线程的话，你应该把待插入的数据分组，不同的线程插入不同的数据吧？
[解决办法]
看起来还不错了，只是DataTable dt的共享没处理好，加把锁就好：

                for (int i = 0; i < 4; i++) 
 
                {
                     t++;
                    lock(dt)
                    {
                        dr = dt.NewRow();
                        dr["id"] = t.ToString();
                        dr["aa"]="192.168.1."+ip.ToString();
                        dr["a"] = mc[sum++].Groups[0].Value.Trim().Replace("/n", "").ToString();
                        dr["b"] = mc[sum++].Groups[0].Value.Trim().Replace("/n", "").ToString();
                        dr["c"] = mc[sum++].Groups[0].Value.Trim().Replace("/n", "").ToString();
                        dr["d"] = mc[sum++].Groups[0].Value.Trim().Replace("/n", "").ToString();
                        dt.Rows.Add(dr);
                    } 
                }