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    ▪asp.net Gridview分页保存选项       代码如下:#region //'Revision: 1.00 Created Date: 2013/08/02 Created ID: Una [#1300071]增加多選框        /// <summary>        /// Session獲取多選框值        /// </summary>        private void Rem.........

    ▪vs2010根据字符串内容添加断点的方法介绍       在vs中我们可以直接用表达式。数值型比较直接用操作符即可。 如i==2,i<2; 但是字符型比较呢？ 加入我们有一个名为string的变量，定义如下: char *string="Two"; 设置断点： 当我们运行上述代.........

    ▪C# 实现抓取网站页面内容的实例方法       抓取新浪网的新闻栏目，如图所示： 使用 谷歌浏览器的查看源代码： 通过分析得知，我们所要找的内容在以下两个标签之间： 代码如下:<!-- publish_helper name='要闻-新闻' p_id='1' t_id='850' d_i.........

代码如下:

#region //'Revision: 1.00 Created Date: 2013/08/02 Created ID: Una [#1300071]增加多選框
        /// <summary>
        /// Session獲取多選框值
        /// </summary>
        private void RememberOldValues()
        {
            ArrayList categoryIDList = new ArrayList();
            string index = "";
            foreach (GridViewRow row in gridView.Rows)
            {
                index = (string)gridView.DataKeys[row.RowIndex].Value;
                bool result = ((CheckBox)row.FindControl("DeleteThis")).Checked;

                // Check in the Session
                if (Session["id"] != null)
                    categoryIDList = (ArrayList)Session["id"];
                if (result)
                {
                    if (!categoryIDList.Contains(index))
                        categoryIDList.Add(index);
                }
                else
                    categoryIDList.Remove(index);
            }
            if (categoryIDList != null && categoryIDList.Count > 0)
                Session["id"] = categoryIDList;
        }

        /// <summary>
        /// Session分頁時之前多選框為true
        /// </summary>
        private void RePopulateValues()
        {
            ArrayList categoryIDList = (ArrayList)Session["id"];
            if (categoryIDList != null && categoryIDList.Count > 0)
            {
                foreach (GridViewRow row in gridView.Rows)
                {
                    string index = (string)gridView.DataKeys[row.RowIndex].Value;
                    if (categoryIDList.Contains(index))
                    {
                        CheckBox myCheckBox = (CheckBox)row.FindControl("DeleteThis");
                        myCheckBox.Checked = true;
                    }
                }
            }
        }
        #endregion

代码如下:

protected void gridView_PageIndexChanging(object sender, GridViewPageEventArgs e)
        {
            RememberOldValues();
            gridView.PageIndex = e.NewPageIndex;
            BindData();
            RePopulateValues();
        }

代码如下:

protected void btnSelect_Click(object sender, EventArgs e)
        {
            string items = "";
            ArrayList categoryIDList = new ArrayList();
            string index ="";
            foreach (GridViewRow row in gridView.Rows)
            {
                index = (string)gridView.DataKeys[row.RowIndex].Value;
                bool result = ((CheckBox)row.FindControl("DeleteThis")).Checked;

                // Check in the Session
                if (Session["id"] != null)
                    categoryIDList = (ArrayList)Session["id"];
                if (result)
                {
                    if (!categoryIDList.Contains(index))
                        categoryIDList.Add(index);
                }
                else
                    categoryIDList.Remove(index);
            }
            if (categoryIDList != null && categoryIDList.Count > 0)
                for (int i = 0; i < categoryIDList.Count; i++)
                {
                    items += categoryIDList[i] + ",";
                }
            items = items.Substring(0, items.Length - 1);
            ScriptManager.RegisterStartupScript(this, this.GetType(), "", "check('" + items + "');", true);
            Session.Remove("id");
        }

代码如下:

<!-- publish_helper name='要闻-新闻' p_id='1' t_id='850' d_id='1' -->

内容。。。。

<!-- publish_helper name='要闻-财经' p_id='30' t_id='98' d_id='1' -->

代码如下:

protected void Enter_Click(object sender, EventArgs e)
        {
            WebClient we = new WebClient();  //主要使用WebClient类
            byte[] myDataBuffer;
            myDataBuffer = we.DownloadData(txtURL.Text);  //该方法返回的是 字节数组，所以需要定义一个byte[]
            string download = Encoding.Default.GetString(myDataBuffer);  //对下载的数据进行编码

          
            //通过查询源代码，获取某两个值之间的新闻内容
            int startIndex = download.IndexOf("<!-- publish_helper name='要闻-新闻' p_id='1' t_id='850' d_id='1' -->");
            int endIndex = download.IndexOf("<!-- publish_helper name='要闻-财经' p_id='30' t_id='98' d_id='1' -->");

            string temp = download.Substring(startIndex, endIndex - startIndex + 1);  //截取新闻内容

            lblMessage.Text = temp;//显示所截取的新闻内容
        }

代码如下:

WebClient wc = new WebClient();
            wc.DownloadFile(TextBox1.Text, @"F:\test.txt");
            Label1.Text = "文件下载完成";

代码如下:

WebClient wc = new WebClient();
            Stream  s =  wc.OpenRead(TextBox1.Text);

            StreamReader sr = new StreamReader(s);
            Label1.Text =  sr.ReadToEnd();