asp.Net 一些常用的方法和类

突然整理硬盘时找到了两年前写的一个网站，准备扔掉，但是还是把部分方法保留到博客吧！虽然现在对于自己已经用处不大，但是还是纪念一下！

生成验证码：

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Drawing;

public partial class CheckCode : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!this.IsPostBack)
        {
            //生成验证码
            string temp = this.GetCode(4);
            HttpCookie cookie = new HttpCookie("yzm");
            cookie.Value = temp;
            Response.Cookies.Add(cookie);
            //画图
            this.GetCheckCodeImage(temp);
        }
    }

    //产生随机字符串 
    private string GetCode(int num)
    {
        string[] source ={ "1", "2", "3", "4", "5", "6", "7", "8", "9", "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", 
            "K", "L", "M", "N", "O","P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z" ,"a", "b", "c", "d", "e", "f", "g", "h", "i", "j", 
            "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y","z"};
        string code = "";
        Random rd = new Random();
        for (int i = 0; i < num; i++)
        {
            code += source[rd.Next(0, source.Length)];
        }
        Session["ValidateCode"] = code;//将字符串保存到Session中，以便需要时进行验证  
        return code;

    }


    #region    验证码

    /// <summary>
    /// 生成验证码
    /// </summary>
    /// <param name="checkCode"></param>
    private void GetCheckCodeImage(string checkCode)
    {
        if (checkCode == null || checkCode.Trim() == String.Empty) return;

        System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)Math.Ceiling((checkCode.Length * 12.5)),25);
        Graphics g = Graphics.FromImage(image);
        try
        {
            Random random = new Random();     //生成随机生成器 
            g.Clear(Color.White);            //清空图片背景色
            for (int i = 0; i < 5; i++)     //画图片的背景噪音线
            {
                int x1 = random.Next(image.Width);
                int x2 = random.Next(image.Width);
                int y1 = random.Next(image.Height);
                int y2 = random.Next(image.Height);
                g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);
            }
            Font font = new System.Drawing.Font("Arial", 12, (System.Drawing.FontStyle.Bold | System.Drawing.FontStyle.Italic));
            System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.DarkRed, 1.2f, true);
            g.DrawString(checkCode, font, brush, 2, 2);

            //画图片的前景噪音点
            for (int i = 0; i < 60; i++)
            {
                int x = random.Next(image.Width);
                int y = random.Next(image.Height);

                image.SetPixel(x, y, Color.FromArgb(random.Next()));
            }

            //画图片的边框线
            g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1);
            System.IO.MemoryStream ms = new System.IO.MemoryStream();
            image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
            Response.ClearContent();
            Response.ContentType = "image/Gif";
            Response.BinaryWrite(ms.ToArray());
        }
        finally
        {
            g.Dispose();
            image.Dispose();
        }
    }

    #endregion


}

清空缓存：

        //清空客户端页面缓存
        public static void ClearClientPageCache()
        {
            HttpContext.Current.Response.Buffer = true;
            HttpContext.Current.Response.Expires = 0;
            HttpContext.Current.Response.ExpiresAbsolute = DateTime.Now.AddDays(-1);
            HttpContext.Current.Response.AddHeader("pragma", "no-cache");
            HttpContext.Current.Response.AddHeader("cache-control", "private");
            HttpContext.Current.Response.CacheControl = "no-cache";
        }

分页方法：

using System;
using System.Collections.Generic;
using System.Web;
using System.Text;
using System.Text.RegularExpressions;

    public class PagingCollection<T>
    {
        private int pagezise;

        public int Pagezise
        {
            get { return pagezise; }
            set { pagezise = value; }
        }
        private int pageindex;

        public int Pageindex
        {
            get { return pageindex; }
            set { pageindex = value; }
        }
        private int TotalCount;

        public int TotalCount1
        {
            get { return TotalCount; }
            set { TotalCount = value; }
        }
        private int TotalPage=0;

        public int TotalPage1
        {
            get { return TotalPage; }
            set { TotalPage = value; }
        }
        private string url;

        public string Url
        {
            get { return url; }
            set { url = value; }
        }
        private string urlparms;

        public string Urlparms
        {
            get { 
            
                return urlparms; }
            set { urlparms = value; }
        }

        /// <summary>
        /// 分页数据构造
        /// </summary>
        /// <param name="source"></param>
        /// <param name="pageindex"></param>
        /// <param name="pagezise"></param>
        /// <param name="totalcount"></param>
        /// <param name="url"></param>
        public PagingCollection(int pageindex, int pagezise, int totalcount, string url)
        {
            this.pageindex = pageindex;
            this.pagezise = pagezise;
            TotalCount = totalcount;
            TotalPage = (int)Math.Ceiling(TotalCount / (double)pagezise);
            this.url = url;

        }

        public PagingCollection(int pageindex, int pagezise, int totalcount, string url,string urlparms)
        {
            this.pageindex = pageindex;
            this.pagezise = pagezise;
            TotalCount = totalcount;
            TotalPage = (int)Math.Ceiling(TotalCount / (double)pagezise);
            this.url = url;
            this.urlparms = urlparms;

        }

        #region 分页属性 返回分页数据

        public string GetPatePar
        {
            get
            {
                if (TotalCount1 > 0)
                {
                    StringBuilder str = new StringBuilder();
                    int startpage = (pageindex - 1) / 10 * 10 + 1;
                    int endpage = (pageindex - 1) / 10 * 10 + 10;
                    int x = endpage > TotalPage ? TotalPage : endpage;
                    str.Append("<div  style=' color:#1E5494;'>共" + TotalPage1 + "页 /  当前第" + pageindex + "页   ");

                    if (HasPreviousPage)
                    {
                        str.Append("<a href=" + url + "?page=1" + GetURLParms + "" + urlparms + ">首页</a> ");
                        str.Append("<a href=" + url + "?page=" + (pageindex - 1) + GetURLParms + "" + urlparms + ">上一页</a>");
                    }
                    else
                    {
                        str.Append("<a href=#>首页 </a>");
                        str.Append("<a href=#>上一页</a>");
                    }
                    for (int i = startpage; i <= x; i++)
                    {
                        if (i == pageindex)
                        {
                            str.Append(string.Format("<a style='margin-left:3px; margin-right:3px;padding:2px 4px 2px 4px;color:red;border:1px solid #cccccc;background-color:#ffffff; '>" + i + "</a>"));
                        }
                        else
                        {
                            str.Append(string.Format("<a style='margin-left:3px; margin-right:3px;'  href=" + url + "?page=" + i + GetURLParms + "" + urlparms + ">" + i + "</a>"));
                        }
                    }
                    if (HasNextPage)
                    {

                        str.Append("<a href=" + url + "?page=" + (pageindex + 1) + GetURLParms + "" + urlparms + ">下一页 </a>");
                        str.Append("<a href=" + url + "?page=" + TotalPage + GetURLParms + "" + urlparms + ">尾页</a>");
                    }
                    else
                    {
                        str.Append("<a href=#>下一页 </a>");
                        str.Append("<a href=#>尾页</a>");
                    }
                    str.Append("</div>");
                    return str.ToString();
                }
                else
                {
                    return "<font color=red>暂无数据！</font>";
                }

            }
        }

        #endregion

        /// <summary>
        /// url重写
        /// </summary>
        private string GetURLParms
        {
            get
            {
                    string query = HttpContext.Current.Request.Url.Query;
                    query = Regex.Replace(query, @"\?page=\d*", "", RegexOptions.Compiled);
                    return query;
              
            }
        }

        /// <summary>
        ///判断是否有上一页
        /// </summary>
        public bool HasPreviousPage
        {
            get
            {
                return (pageindex > 1);
            }
        }
        /// <summary>
        ///判断是否有下一页
        /// </summary>
        public bool HasNextPage
        {
            get
            {
                return (pageindex < TotalPage);
            }
        }
    }

    /// <summary>
    /// 分页数据类
    /// </summary>
    /// <typeparam name="T"></typeparam>
    public class PageBean<T>
    {

        IList<T> datasource = new List<T>();

        public IList<T> Datasource
        {
            get { return datasource; }
            set { datasource = value; }
        }

        int pagesum;

        public int Pagesum
        {
            get { return pagesum; }
            set { pagesum = value; }
        }
        public PageBean(IList<T> datasource, int pagesum)
        {
            this.datasource = datasource;
            this.pagesum = pagesum;
        }
        public PageBean()
        {
            //
            // TODO: 在此处添加构造函数逻辑
            //
        }
}

生成图片水印：

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.IO;
using System.Drawing;
using System.Drawing.Imaging;

/// <summary>
/// PictureHandler 的摘要说明
/// </summary>
    public class PicHandler : IHttpHandler
    {
        public void ProcessRequest(HttpContext context)
        {
            context.Response.ContentType = "text/plain";
   
            string imgUrl = context.Request.PhysicalPath;//得到当前处理图片的物理路径
            if (File.Exists(imgUrl))
            {
                Image img = Image.FromFile(imgUrl);//通过图片路径得到图片对象
                Image watering = Image.FromFile(context.Server.MapPath("~/themes/images/water.jpg"));//得到数字水印图片
                Graphics g = Graphics.FromImage(img);//通过图片对象创建画布
                g.DrawImage(watering, new Rectangle(img.Width - watering.Width, img.Height - watering.Height, watering.Width, watering.Height), 0, 0, watering.Width, watering.Height, GraphicsUnit.Pixel);//画图
                context.Response.ContentType = "image/jpeg";//设置图片的格式
                img.Save(context.Response.OutputStream, ImageFormat.Jpeg);//把图片保存在输出流中
                g.Dispose();//销毁画布
                img.Dispose();//销毁图片
                context.Response.End();
            }
            else
            {
                Image defaultimg = Image.FromFile(context.Server.MapPath("~/themes/images/water.jpg"));//通过图片路径得到默认图片对象
                Image watering = Image.FromFile(context.Server.MapPath("~/themes/images/water.jpg"));//得到数字水印图片
                Graphics g = Graphics.FromImage(defaultimg);//通过图片对象创建画布
                g.DrawImage(watering, new Rectangle(defaultimg.Width - watering.Width, defaultimg.Height - watering.Height, watering.Width, watering.Height), 0, 0, watering.Width, watering.Height, GraphicsUnit.Pixel);//画图

                context.Response.ContentType = "image/jpeg";//设置图片的格式
                defaultimg.Save(context.Response.OutputStream, ImageFormat.Jpeg);
                g.Dispose();
                defaultimg.Dispose();
                context.Response.End();
            }

        }
        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }

防注入过滤：

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;

/// <summary>
/// SqlCheck 的摘要说明
/// </summary>

    public class SqlCheck
    {
      
        public void CheckSql()
        {
          
            string jk1986_sql = "exec↓select↓drop↓alter↓exists↓union↓and↓or↓xor↓order↓mid↓asc↓execute↓xp_cmdshell↓insert↓update↓delete↓join↓declare↓char↓sp_oacreate↓wscript.shell↓xp_regwrite↓'↓;↓--";
            string[] jk_sql = jk1986_sql.Split('↓');
            foreach (string jk in jk_sql)
            {
                // -----------------------防 Post 注入-----------------------
                if (System.Web.HttpContext.Current.Request.Form != null)
                {
                    for (int k = 0; k < System.Web.HttpContext.Current.Request.Form.Count; k++)
                    {
                        string getsqlkey = System.Web.HttpContext.Current.Request.Form.Keys[k];
                        string getip;
                        if (System.Web.HttpContext.Current.Request.Form[getsqlkey].ToLower().Contains(jk) == true)
                        {
                            System.Web.HttpContext.Current.Response.Write("<script Language=JavaScript>alert('请勿提交非法字符!');</" + "script>");
                            System.Web.HttpContext.Current.Response.Write("非法操作！系统做了如下记录 ↓" + "<br>");
                            if (System.Web.HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"] != null)
                            {
                                getip = System.Web.HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];
                            }
                            else
                            {
                                getip = System.Web.HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];
                            }
                            System.Web.HttpContext.Current.Response.Write("操 作 I  P ：" + getip + "<br>");
                            System.Web.HttpContext.Current.Response.Write("操 作 时 间：" + DateTime.Now.ToString() + "<br>");
                            System.Web.HttpContext.Current.Response.Write("操 作 页 面：" + System.Web.HttpContext.Current.Request.ServerVariables["URL"] + "<br>");
                            System.Web.HttpContext.Current.Response.Write("提 交 方 式：P O S T " + "<br>");
                            System.Web.HttpContext.Current.Response.Write("提 交 参 数：" + jk + "<br>");
                            System.Web.HttpContext.Current.Response.Write("提 交 数 据：" + System.Web.HttpContext.Current.Request.Form[getsqlkey].ToLower() + "<br>");
                            System.Web.HttpContext.Current.Response.End();
                        }
                    }
                }
                // -----------------------防 GET 注入-----------------------
                if (System.Web.HttpContext.Current.Request.QueryString != null)
                {
                    for (int k = 0; k < System.Web.HttpContext.Current.Request.QueryString.Count; k++)
                    {
                        string getsqlkey = System.Web.HttpContext.Current.Request.QueryString.Keys[k];
                        string getip;
                        if (System.Web.HttpContext.Current.Request.QueryString[getsqlkey].ToLower().Contains(jk) == true)
                        {
                            System.Web.HttpContext.Current.Response.Write("<script Language=JavaScript>alert('请勿提交非法字符!');</" + "script>");
                            System.Web.HttpContext.Current.Response.Write("非法操作！系统做了如下记录 ↓" + "<br>");
                            if (System.Web.HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"] != null)
                            {
                                getip = System.Web.HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];
                            }
                            else
                            {
                                getip = System.Web.HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];
                            }
                            System.Web.HttpContext.Current.Response.Write("操 作 I  P ：" + getip + "<br>");
                            System.Web.HttpContext.Current.Response.Write("操 作 时 间：" + DateTime.Now.ToString() + "<br>");
                            System.Web.HttpContext.Current.Response.Write("操 作 页 面：" + System.Web.HttpContext.Current.Request.ServerVariables["URL"] + "<br>");
                            System.Web.HttpContext.Current.Response.Write("提 交 方 式：G E T " + "<br>");
                            System.Web.HttpContext.Current.Response.Write("提 交 参 数：" + jk + "<br>");
                            System.Web.HttpContext.Current.Response.Write("提 交 数 据：" + System.Web.HttpContext.Current.Request.QueryString[getsqlkey].ToLower() + "<br>");
                            System.Web.HttpContext.Current.Response.End();
                        }
                    }
                }

                // -----------------------防 Cookies 注入-----------------------
                if (System.Web.HttpContext.Current.Request.Cookies != null)
                {
                    for (int k = 0; k < System.Web.HttpContext.Current.Request.Cookies.Count; k++)
                    {
                        string getsqlkey = System.Web.HttpContext.Current.Request.Cookies.Keys[k];
                        string getip;
                        if (System.Web.HttpContext.Current.Request.Cookies[getsqlkey].Value.ToLower().Contains(jk) == true)
                        {
                            System.Web.HttpContext.Current.Response.Write("<script Language=JavaScript>alert('请勿提交非法字符!');</" + "script>");
                            System.Web.HttpContext.Current.Response.Write("非法操作！系统做了如下记录 ↓" + "<br>");
                            if (System.Web.HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"] != null)
                            {
                                getip = System.Web.HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];
                            }
                            else
                            {
                                getip = System.Web.HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];
                            }
                            System.Web.HttpContext.Current.Response.Write("操 作 I  P ：" + getip + "<br>");
                            System.Web.HttpContext.Current.Response.Write("操 作 时 间：" + DateTime.Now.ToString() + "<br>");
                            System.Web.HttpContext.Current.Response.Write("操 作 页 面：" + System.Web.HttpContext.Current.Request.ServerVariables["URL"] + "<br>");
                            System.Web.HttpContext.Current.Response.Write("提 交 方 式： Cookies " + "<br>");
                            System.Web.HttpContext.Current.Response.Write("提 交 参 数：" + jk + "<br>");
                            System.Web.HttpContext.Current.Response.Write("提 交 数 据：" + System.Web.HttpContext.Current.Request.Cookies[getsqlkey].Value.ToLower() + "<br>");
                            System.Web.HttpContext.Current.Response.End();
                        }
                    }
                }

            }
        } 
    }

页面过滤HTML：

/// <summary> /// 过滤标记 /// </summary> /// <param name="NoHTML">包括HTML，脚本，数据库关键字，特殊字符的源码 </param> /// <returns>已经去除标记后的文字</returns> public static string NoHTML(string Htmlstring) { if (Htmlstring == null) { return ""; } else { //删除脚本 Htmlstring = Regex.Replace(Htmlstring, @"<script[^>]*?>.*?</script>", "", RegexOptions.IgnoreCase); //删除HTML Htmlstring = Regex.Replace(Htmlstring, @"<(.[^>]*)>", "", RegexOptions.IgnoreCase); Htmlstring = Regex.Replace(Htmlstring, @"([\r\n])[\s]+", "", RegexOptions.IgnoreCase); Htmlstring = Regex.Replace(Htmlstring, @"-->", "", RegexOptions.IgnoreCase); Htmlstring = Regex.Replace(Htmlstring, @"<!--.*", "", RegexOptions.IgnoreCase); Htmlstring = Regex.Replace(Htmlstring, @"&(quot|#34);", "\"", RegexOptions.IgnoreCase); Htmlstring = Regex.Replace(Htmlstring, @"&(amp|#38);", "&", RegexOptions.IgnoreCase); Htmlstring = Regex.Replace(Htmlstring, @"&(lt|#60);", "<", RegexOptions.IgnoreCase); Htmlstring = Regex.Replace(Htmlstring, @"&(gt|#62);", ">", RegexOptions.IgnoreCase); Htmlstring = Regex.Replace(Htmlstring, @"&(nbsp|#160);", " ", RegexOptions.IgnoreCase); Htmlstring = Regex.Replace(Htmlstring, @"&(iexcl|#161);", "\xa1", RegexOptions.IgnoreCase); Htmlstring = Regex.Replace(Htmlstring, @"&(cent|#162);", "\xa2", RegexOptions.IgnoreCase); Htmlstring = Regex.Replace(Htmlstring, @"&(pound|#163);", "\xa3", RegexOptions.IgnoreCase); Htmlstring = Regex.Replace(Htmlstring, @"&(copy|#169);", "\xa9", RegexOptions.IgnoreCase); Htmlstring = Regex.Replace(Htmlstring, @"&#(\d+);", "", RegexOptions.IgnoreCase); Htmlstring = Regex.Replace(Htmlstring, "xp_cmdshell", "", RegexOptions.IgnoreCase); //删除与数据库相关的词 Htmlstring = Regex.Replace(Htmlstring, "select", "", RegexOptions.IgnoreCase); Htmlstring = Regex.Replace(Htmlstring, "insert", "", RegexOptions.IgnoreCase); Htmlstring = Regex.Replace(Htmlstring, "delete from", "", RegexOptions.IgnoreCase); Htmlstring = Regex.Replace(Htmlstring, "count''", "", RegexOptions.IgnoreCase); Htmlstring = Regex.Replace(Htmlstring, "drop table", "", RegexOptions.IgnoreCase); Htmlstring = Regex.Replace(Htmlstring, "truncate", "", RegexOptions.IgnoreCase); Htmlstring = Regex.Replace(Htmlstring, "asc", "", RegexOptions.IgnoreCase); Htmlstring = Regex.Replace(Htmlstring, "mid", "", RegexOptions.IgnoreCase); Htmlstring = Regex.Replace(Htmlstring, "char", "", RegexOptions.IgnoreCase); Htmlstring = Regex.Replace(Htmlstring, "xp_cmdshell", "", RegexOptions.IgnoreCase); Htmlstring = Regex.Replace(Htmlstring, "exec master", "", RegexOptions.IgnoreCase); Htmlstring = Regex.Replace(Htmlstring, "net localgroup administrators", "", RegexOptions.IgnoreCase); Htmlstring = Regex.Replace(Htmlstring, "and", "", RegexOptions.IgnoreCase); return Htmlstring ; } }

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原文地址：https://www.cnblogs.com/javawebsoa/p/2458104.html