杂项收集，包括-发邮件、二维码生成、文件下载、压缩、导出excel

本篇就最近工作解决的问题做个代码收集。包括以下几个方面：发邮件、二维码生成、文件下载、压缩、导出excel。有一种可用的解决方法就好，不求全面，不求原理。

1、发邮件：

命名空间:System.Net.Mail
程序集:System（在 system.dll 中）

tips： MailMessage 类的实例用于构造可使用 SmtpClient 类传输到 SMTP 服务器以便传递的电子邮件。

         若要指定电子邮件的发件人、收件人和内容，请使用 MailMessage 类的关联属性。一般需要注意的有 发件人From、收件人To、抄送 (CC)、密件抄送 (BCC)、附件Attachments、主题Subject、邮件正文Body。
另外，测试时正文和标题不要随意输入类似"afdadva"等等的无意义字母数字，会被服务器默认为垃圾邮件而拦截。

      string senderServerIp = "smtp.126.com";

                        string fromMailAddress = "xxx@126.com";
                        string mailUsername = "xxx@126.com";
                        string mailPassword = "pppp"; //发送邮箱的密码
                        string mailPort = "25";
                        string attachPath = path + "/" + fileName;//附件
                        parmer.Content = "该邮件由系统代发.";
                        MailHelper email = new MailHelper(senderServerIp, parmer.ReceiveMailbox, fromMailAddress,
                            parmer.Title, parmer.Content, mailUsername, mailPassword, mailPort, false, true);
                        email.AddAttachments(attachPath);
                        email.Send();

using System;
using System.IO;
using System.Net.Mail;
using System.Net.Mime;

namespace NewEnergyHandler.Common
{
    public class MailHelper
    {
        private readonly MailMessage _mMailMessage;   //主要处理发送邮件的内容（如：收发人地址、标题、主体、图片等等）
        private SmtpClient _mSmtpClient; //主要处理用smtp方式发送此邮件的配置信息（如：邮件服务器、发送端口号、验证方式等等）
        private readonly int _mSenderPort;   //发送邮件所用的端口号（htmp协议默认为25）
        private readonly string _mSenderServerHost;    //发件箱的邮件服务器地址（IP形式或字符串形式均可）
        private readonly string _mSenderPassword;    //发件箱的密码
        private readonly string _mSenderUsername;   //发件箱的用户名（即@符号前面的字符串，例如：hello@163.com，用户名为：hello）
        private readonly bool _mEnableSsl;    //是否对邮件内容进行socket层加密传输
        private readonly bool _mEnablePwdAuthentication;  //是否对发件人邮箱进行密码验证

        ///<summary>
        /// 构造函数
        ///</summary>
        ///<param name="server">发件箱的邮件服务器地址</param>
        ///<param name="toMail">收件人地址（可以是多个收件人，程序中是以“;"进行区分的）</param>
        ///<param name="fromMail">发件人地址</param>
        ///<param name="subject">邮件标题</param>
        ///<param name="emailBody">邮件内容（可以以html格式进行设计）</param>
        ///<param name="username">发件箱的用户名（即@符号前面的字符串，例如：hello@163.com，用户名为：hello）</param>
        ///<param name="password">发件人邮箱密码</param>
        ///<param name="port">发送邮件所用的端口号（htmp协议默认为25）</param>
        ///<param name="sslEnable">true表示对邮件内容进行socket层加密传输，false表示不加密</param>
        ///<param name="pwdCheckEnable">true表示对发件人邮箱进行密码验证，false表示不对发件人邮箱进行密码验证</param>
        public MailHelper(string server, string toMail, string fromMail, string subject, string emailBody, string username, string password, string port, bool sslEnable, bool pwdCheckEnable)
        {
            try
            {
                _mMailMessage = new MailMessage();
                _mMailMessage.To.Add(toMail);
                _mMailMessage.From = new MailAddress(fromMail);
                _mMailMessage.Subject = subject;
                _mMailMessage.Body = emailBody;
                _mMailMessage.IsBodyHtml = true;
                _mMailMessage.BodyEncoding = System.Text.Encoding.UTF8;
                _mMailMessage.Priority = MailPriority.Normal;
                _mSenderServerHost = server;
                _mSenderUsername = username;
                _mSenderPassword = password;
                _mSenderPort = Convert.ToInt32(port);
                _mEnableSsl = sslEnable;
                _mEnablePwdAuthentication = pwdCheckEnable;
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.ToString());
            }
        }

        ///<summary>
        /// 添加附件
        ///</summary>
        ///<param name="attachmentsPath">附件的路径集合，以分号分隔</param>
        public void AddAttachments(string attachmentsPath)
        {
            try
            {
                string[] path = attachmentsPath.Split(';'); //以什么符号分隔可以自定义
                for (int i = 0; i < path.Length; i++)
                {
                    var data = new Attachment(path[i], MediaTypeNames.Application.Octet);
                    var disposition = data.ContentDisposition;
                    disposition.CreationDate = File.GetCreationTime(path[i]);
                    disposition.ModificationDate = File.GetLastWriteTime(path[i]);
                    disposition.ReadDate = File.GetLastAccessTime(path[i]);
                    disposition.FileName = path[i].Substring(path[i].LastIndexOf('/')+1);
                    _mMailMessage.Attachments.Add(data);
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.ToString());
            }
        }

        ///<summary>
        /// 邮件的发送
        ///</summary>
        public void Send()
        {
            try
            {
                if (_mMailMessage != null)
                {
                    _mSmtpClient = new SmtpClient
                    {
                        Host = _mSenderServerHost,
                        Port = _mSenderPort,
                        UseDefaultCredentials = false,
                        EnableSsl = _mEnableSsl
                    };
                    if (_mEnablePwdAuthentication)
                    {
                        System.Net.NetworkCredential nc = new System.Net.NetworkCredential(_mSenderUsername, _mSenderPassword);
                        _mSmtpClient.Credentials = nc.GetCredential(_mSmtpClient.Host, _mSmtpClient.Port, "NTLM");
                    }
                    else
                    {
                        _mSmtpClient.Credentials = new System.Net.NetworkCredential(_mSenderUsername, _mSenderPassword);
                    }
                    _mSmtpClient.DeliveryMethod = SmtpDeliveryMethod.Network;
                    _mSmtpClient.Send(_mMailMessage);
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.ToString());
            }
        }
    }
}

2、二维码生成

命名空间：using ThoughtWorks.QRCode.Codec;

程序集:ThoughtWorks.QRCode.dll(需从网上下载)。

tips： QRCodeEncoder类设置一下生成相关的参数，而后 确定二维码里的内容，以及要保存的文件名和路径即可。

 QrCodeHelper qrCodeHelper =new QrCodeHelper();
 var qrCodeFilePath = qrCodeHelper.CreateCode_Simple("testString.");

using System;
using System.Drawing;
using System.IO;
using System.Text;
using ThoughtWorks.QRCode.Codec;

namespace Common
{
    public class QrCodeHelper
    {
        public string CreateNr(int id)
        {
            return id.ToString();
        }
        //程序路径  
        readonly string _currentPath = ConfigHelper.GetConfigString("QrCodePicPath");
        public string CreateCode_Simple(int scale, string nr)
        {
            var qrCodeEncoder = new QRCodeEncoder
            {
                QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE,
                QRCodeScale = scale,
                QRCodeVersion = 0,
                QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M
            };
            Image image = qrCodeEncoder.Encode(nr, Encoding.UTF8);

            //文件名  
            var fileName = DateTime.Now.ToString(@"yyyymmddhhmmssfff");
            SaveImg(_currentPath, fileName + ".jpg", image);
            image.Dispose();
            return fileName;
        }
        public string CreateCode_Simple(string nr)
        {
            return CreateCode_Simple(4, nr);
        }

        /// <summary>  
        /// 保存图片  
        /// </summary>  
        /// <param name="strPath">保存路径</param>
        /// <param name="fileName"></param>
        /// <param name="img">图片</param>  
        public static void SaveImg(string strPath, string fileName, Image img)
        {
            //保存图片到目录  
            if (!Directory.Exists(strPath))
            {
                //当前目录不存在，则创建  
                Directory.CreateDirectory(strPath);
            }
            img.Save(strPath + "/" + fileName, System.Drawing.Imaging.ImageFormat.Jpeg);

        }

    }
}

 3、文件下载

网站下载一般就是Response里写入文件，注意下文件的后缀，类型匹配就ok。

                var response = HttpContext.Response;
                response.Clear();
                response.Buffer = true;
                response.Charset = "utf-8";
                var file1 = "xxx.dll";
                response.AppendHeader("Content-Disposition", "attachment;filename=" + file1);
                response.ContentEncoding = System.Text.Encoding.UTF8;
                response.ContentType = "application/x-msdownload";
                var pathTest = "D:/CommonTest";
                response.WriteFile(pathTest + "/" + file1);
                response.End();

4、压缩

这篇博文详细明了：.NET 4.5 中新提供的压缩类   

5、导出excel

命名空间:using Aspose.Cells;

程序集:Aspose.Cells.dll

tips:Aspose可以脱离微软的excel，方便使用。

            var workbook = new Workbook();
            var sheet = workbook.Worksheets[0]; 
     var colIndex = "A";
 string title = "名称,分类,编号,单位,数量,状态,责任人,部门,时间";
            string[] titleList=title.Split(',');
            foreach (string item in titleList)
            {
                sheet.Cells[colIndex + 1].PutValue(item);
                sheet.Cells[colIndex + 1].SetStyle(styleTitle);
                colIndex = ((char)(colIndex[0] + 1)).ToString();
            }

            workbook.Save(file);

           int row = 2;
            int column;
            foreach (var d in data)
            {
                column = 0;
                var model= d as Model;
                if (model== null) continue;
              //和你的标题对应好就行。
                sheet.Cells[row, column].PutValue(model.Name);
                sheet.Cells[row, column++].SetStyle(styleBody);//设置样式
            }

如果是单条数据要做一个卡片的excel，可以先写个模版，然后打开模版，填充数据。我遇到过把不同类型的数据都做成卡片，添加到一个个sheet里。

  var workbookResult = new Workbook();

            var workbookType1 = new Workbook();
            var workbookType2 = new Workbook();
            var workbookType3 = new Workbook();
         workbookType1.Open(path + "/type1.xlsx");
         workbookType2.Open(path + "/type2.xlsx");
         workbookType3.Open(path + "/type3.xlsx");
   
Worksheet sheet;
if(type=type1)
{
    sheet = workbookType1.Worksheets[0];
        var cells = sheet.Cells; //单元格
    //todo: 填充你的数据到cells.
}
else if(..){}
else if(..){}


  workbookResult.Worksheets.Add(); //新增一个sheet
  var sheetR = workbook.Worksheets[i++]; 
  sheetR.Copy(sheet); //将生成的结果拷贝到新的sheet中
  workbookResult.Save(fileName);

                        var path = ConfigHelper.GetConfigString("PicFilePath");
                        var image = Image.FromFile(path + "/" + asset.PicFile);
                        var ms = new MemoryStream();
                        image.Save(ms, ImageFormat.Jpeg);
                        sheet.Pictures.Add(24, 0, 41, 5, ms); //左上角 和 右下角 的下标

另注：以上用到的代码，很多都是网上搜索而来，并非原创，工作匆忙，未能保存原链接。若是原作者觉得侵权，删之。