asp.net常用函数收藏

//弹出对话框 public static void salert(string str) { HttpContext.Current.Response.Write("<script>alert('" + str + "');</script>"); } /// <summary> /// 显示消息提示框，并回到前一页面 /// </summary> /// <param name="page">当前页面指针，一般为this</param> /// <param name="strMsg">提示信息</param> public static void ShowGoHistory(System.Web.UI.Page page, string strMsg) { page.ClientScript.RegisterStartupScript(page.GetType(), "message", "<script language='javascript' defer>alert('" + strMsg.ToString() + "');window.history.go(-1);</script>"); } /// <summary> /// 显示消息提示对话框，并进行页面跳转 /// </summary> /// <param name="page">当前页面指针，一般为this</param> /// <param name="strMsg">提示信息</param> /// <param name="url"> 跳转的目标URL</param> public static void ShowRedirect(System.Web.UI.Page page, string strMsg, string url) { StringBuilder Builder = new StringBuilder(); Builder.Append("<script language='javascript' defer>"); Builder.AppendFormat("alert('{0}');", strMsg); Builder.AppendFormat("top.location.href='{0}'", url); Builder.Append("</script>"); page.ClientScript.RegisterStartupScript(page.GetType(), "message", Builder.ToString()); } //为了插入单引号 public static string delSingle(string str) { return str.Replace("'", "''"); } //由gridviw导出为Excel public static void ToExcel(System.Web.UI.Control ctl) { HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment;filename=Excel.xls"); HttpContext.Current.Response.Charset = "UTF-8"; HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.Default; HttpContext.Current.Response.ContentType = "application/ms-excel";//image/JPEG;text/HTML;image/GIF;vnd.ms-excel/msword ctl.Page.EnableViewState = false; System.IO.StringWriter tw = new System.IO.StringWriter(); System.Web.UI.HtmlTextWriter hw = new System.Web.UI.HtmlTextWriter(tw); ctl.RenderControl(hw); HttpContext.Current.Response.Write(tw.ToString()); HttpContext.Current.Response.End(); } ///using System.Security.Cryptography; ///using System.Text; /// <summary> /// MD5函数 /// </summary> /// <param name="str">原始字符串</param> /// <returns>MD5结果</returns> public static string MD5(string str) { byte[] b = Encoding.Default.GetBytes(str); b = new MD5CryptoServiceProvider().ComputeHash(b); string ret = ""; for (int i = 0; i < b.Length; i++) ret += b[i].ToString("x").PadLeft(2, '0'); return ret; } ///using System.Net; ///using System.IO; /// <summary> /// 根据Url获得源文件内容 /// </summary> /// <param name="url">合法的Url地址</param> /// <returns></returns> public static string GetSourceTextByUrl(string url) { WebRequest request = WebRequest.Create(url); request.Timeout = 20000;//20秒超时 WebResponse response = request.GetResponse(); Stream resStream = response.GetResponseStream(); StreamReader sr = new StreamReader(resStream); return sr.ReadToEnd(); }