[开源]快速构建文件下载，支持文件加密，自定义限速

项目说明

1. 目前支持webform文件下载，后续支持mvc
2. 支持下载文件加密以及下载限速
3. 项目源码：masterchief.dotnet.framework.download
4. nuget：install-package masterchief.dotnet.framework.download
5. 欢迎pr，欢迎star；

如何使用

1. 通过masterchief.dotnet.core.config构建下载配置文件

   <?xml version="1.0" encoding="utf-16"?>
   <downloadconfig xmlns:xsi="http://www.w3.org/2001/xmlschema-instance" xmlns:xsd="http://www.w3.org/2001/xmlschema"
                   filenameencryptoriv="0102030405060708090a0a0c0d010208"
                   filenameencryptorkey="dotnetdownloadconfig"
                   limitdownloadspeedkb="1024"
                   downloadmaindirectory="d:\onedrive\软件\工具\">
   </downloadconfig>

2. 在webform下新建一般处理程序，并实现downloadhandler抽象类

   /// <summary>
   ///     filedownloadhandler 的摘要说明
   /// </summary>
   public class filedownloadhandler : downloadhandler, ihttphandler
   {
       public void processrequest(httpcontext context)
       {
           var filename = context.request["filename"];
           startdownloading(context, filename);
       }
   
       public bool isreusable => false;
   
       public override void ondownloadfailed(httpcontext context, string filename, string filepath, string ex)
       {
           context.response.write(ex);
       }
   
       public override void ondownloadsucceed(httpcontext context, string filename, string filepath)
       {
           var result = $"文件[{filename}]下载成功，映射路径：{filepath}";
           context.response.write(result);
       }
   }

3. 在webform下载文件加密显示

   protected void page_load(object sender, eventargs e)
   {
       string url = downloadfilecontext.instance.encryptfilename("typora-setup-x64.exe");
       link.navigateurl = "~/filedownloadhandler.ashx?filename=" + url;
   }

4. 运行效果