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主要包括 得到站点用户IP,去除字符串最后一个','号、去除字符串第一个'/'号等

//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();
}

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