DIDAO.Common --- 项目中的常用类及其中函数

 

常用函数：

CommonHelper.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;
using System.Web;
using RazorEngine;
using RazorEngine.Text;

namespace DIDAO.Common
{
    public class CommonHelper
    {
        /// <summary>
        /// 传入虚拟路径 返回全路径的html字符串
        /// </summary>
        /// <param name="context">当前数据上下文</param>
        /// <param name="virtualPath">虚拟路径</param>
        /// <returns>返回全路径的html字符串</returns>
        public static string GetHtmlFromVirtualPath(HttpContext context,string virtualPath)
        {
            string fileFullPath = context.Server.MapPath(virtualPath);
            string html = File.ReadAllText(fileFullPath);
            return html;
        }

        /// <summary>
        /// 输出错误信息到错误界面
        /// </summary>
        /// <param name="context">当前数据上下文</param>
        /// <param name="virtualPath">错误页面的 虚拟路径</param>
        /// <param name="errormsg">错误信息</param>
        public static void OutputError(HttpContext context, string virtualPath,string errormsg)
        {
            string htmlError = GetHtmlFromVirtualPath(context, virtualPath);
            string htmlNewError = htmlError.Replace("{errormsg}", errormsg);
            context.Response.Write(htmlNewError);
        }
        
        /// <summary>
         /// 加密
         /// </summary>
         /// <param name="str">原始密码</param>
         /// <returns>加密密码</returns>
         public static string Md5Encode(string str)
         {
             byte[] bytes = System.Text.Encoding.Default.GetBytes(str);
             MD5 md5 = new MD5CryptoServiceProvider();
             byte[] newBytes = md5.ComputeHash(bytes);
             string newStr = BitConverter.ToString(newBytes).Replace("-","");
             return newStr;
         }

         /// <summary>
         /// 检查字符串 是否含有特殊字符 :含有-false
         /// </summary>
         /// <param name="str">输入字符串</param>
         /// <returns>是否含有特殊字符:含有-false</returns>
         public static bool CheckStringIsSpecialChar(string str)
         {
             bool flag = true;
             char[] chs = { ',', '/', '\\', '\'', '"' };
             foreach (char ch in chs)
             {
                 if (str.IndexOf(ch) >= 0)
                 {
                     flag = false;
                 }
             }
             return flag;
         }


        //DES NET加密解密
         public static string _KEY = "YANGGUO1";  //密钥
         public static string _IV = "YANGGUO2";   //向量

         /// <summary>
         /// 加密
         /// </summary>
         /// <param name="data"></param>
         /// <returns></returns>
         public static string DesEncode(string data)
         {

             byte[] byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(_KEY);
             byte[] byIV = System.Text.ASCIIEncoding.ASCII.GetBytes(_IV);

             DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider();
             int i = cryptoProvider.KeySize;
             MemoryStream ms = new MemoryStream();
             CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateEncryptor(byKey, byIV), CryptoStreamMode.Write);

             StreamWriter sw = new StreamWriter(cst);
             sw.Write(data);
             sw.Flush();
             cst.FlushFinalBlock();
             sw.Flush();

             string strRet = Convert.ToBase64String(ms.GetBuffer(), 0, (int)ms.Length);
             return strRet;
         }

         /// <summary>
         /// 解密
         /// </summary>
         /// <param name="data"></param>
         /// <returns></returns>
         public static string DesDecode(string data)
         {

             byte[] byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(_KEY);
             byte[] byIV = System.Text.ASCIIEncoding.ASCII.GetBytes(_IV);

             byte[] byEnc;

             try
             {
                 data.Replace("_%_", "/");
                 data.Replace("-%-", "#");
                 byEnc = Convert.FromBase64String(data);

             }
             catch
             {
                 return null;
             }

             DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider();
             MemoryStream ms = new MemoryStream(byEnc);
             CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateDecryptor(byKey, byIV), CryptoStreamMode.Read);
             StreamReader sr = new StreamReader(cst);
             return sr.ReadToEnd();
         }

        

         
    }
}

CommonHelper.cs