在零配置情况下，文件的上传文件夹是根目录下的Files文件夹，如何自定义文件的上传文件夹呢？

MVC文件上传相关兄弟篇：

MVC文件上传01-使用jquery异步上传并客户端验证类型和大小 
MVC文件上传02-使用HttpPostedFileBase上传多个文件  
MVC文件上传03-使用Request.Files上传多个文件
MVC文件上传04-使用客户端jQuery-File-Upload插件和服务端Backload组件实现多文件异步上传

□ 在web.config中配置

   1:  <configuration>
   2:    <configSections>
   3:    ...
   4:    <section name="backload" type="Backload.Configuration.BackloadSection, Backload, Version=1.9.3.1, Culture=neutral, PublicKeyToken=02eaf42ab375d363" requirePermission="false" />
   5:    </configSections>
   6:    
   7:     <backload xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:name="urn:fileupload-schema" xsi:noNamespaceSchemaLocation="Web.FileUpload.xsd">
   8:      <fileSystem filesRoot="~/Uploads" />
   9:    </backload>
  10:   
  11:  </configuration>

.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }

Version可以通过右键程序集属性中查到。

PublicKeyToken可以通过反编译器，比如Reflector查到。

□ 注销BackloadDemoController的Index方法

   1:  using System.Web.Mvc;
   2:   
   3:  namespace MvcApplication6.Controllers
   4:  {
   5:      public class BackloadDemoController : Controller
   6:      {
   7:          // GET: /BackupDemo/
   8:          //public ActionResult Index()
   9:          //{
  10:          //    return View();
  11:          //}
  12:      }
  13:  }
  14:   

.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }

□ 让BaseController继承BackloadDemoController，并注销Index方法

   1:  using System.Web.Mvc;
   2:   
   3:  namespace MvcApplication6.Controllers
   4:  {
   5:      public class BaseController : BackloadDemoController
   6:      {
   7:          //public ActionResult Index()
   8:          //{
   9:          //    return View();
  10:          //}
  11:      }
  12:  }

.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }

□ 让HomeController继承BaseController

   1:  using System.Web.Mvc;
   2:   
   3:  namespace MvcApplication6.Controllers
   4:  {
   5:      public class HomeController : BaseController
   6:      {
   7:          public ActionResult Index()
   8:          {
   9:              return View();
  10:          }
  11:      }
  12:  }
  13:   

.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }

□ _Layout.cshtml视图

   1:  <!DOCTYPE html>
   2:  <html>
   3:  <head>
   4:      <meta charset="utf-8" />
   5:      <meta name="viewport" content="width=device-width" />
   6:      <title>@ViewBag.Title</title>
   7:      @Styles.Render("~/Content/css")
   8:      @Styles.Render("~/Content/themes/base/css")
   9:      @Styles.Render("~/bundles/fileupload/bootstrap/BasicPlusUI/css")
  10:      @Scripts.Render("~/bundles/modernizr")
  11:   
  12:  </head>
  13:  <body>
  14:      @RenderBody()
  15:   
  16:      @Scripts.Render("~/bundles/jquery")
  17:      @Scripts.Render("~/bundles/jqueryui")
  18:      @Scripts.Render("~/bundles/fileupload/bootstrap/BasicPlusUI/js")
  19:      @RenderSection("scripts", required: false)
  20:  </body>
  21:  </html>
  22:   

.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }

□ Home/Index.cshtml视图

展开@{

    ViewBag.Title = "Index";

    Layout = "~/Views/Shared/_Layout.cshtml";

}

    <div>

        <!-- The file upload form used as target for the file upload widget -->

        <form id="fileupload" action="/Backload/UploadHandler" method="POST" enctype="multipart/form-data">

            <!-- Redirect browsers with JavaScript disabled to the origin page -->

            <noscript><input type="hidden" name="redirect" value="/"></noscript>

            <!-- The fileupload-buttonbar contains buttons to add/delete files and start/cancel the upload -->

            <div class="row fileupload-buttonbar">

                <div class="span7">

                    <!-- The fileinput-button span is used to style the file input field as button -->

                    <span class="btn btn-success fileinput-button">

                        <i class="icon-plus icon-white"></i>

                        <span>添加文件...</span>

                        <input type="file" name="files[]" multiple>

                    </span>

                    <button type="submit" class="btn btn-primary start">

                        <i class="icon-upload icon-white"></i>

                        <span>开始上传</span>

                    </button>

                    <button type="reset" class="btn btn-warning cancel">

                        <i class="icon-ban-circle icon-white"></i>

                        <span>取消上传</span>

                    </button>

                    <button type="button" class="btn btn-danger delete">

                        <i class="icon-trash icon-white"></i>

                        <span>删除</span>

                    </button>

                    <input type="checkbox" class="toggle">

                    <!-- The loading indicator is shown during file processing -->

                    <span class="fileupload-loading"></span>

                </div>

                <!-- The global progress information -->

                <div class="span5 fileupload-progress fade">

                    <!-- The global progress bar -->

                    <div class="progress progress-success progress-striped active" role="progressbar" aria-valuemin="0" aria-valuemax="100">

                        <div class="bar" style="width:0%;"></div>

                    </div>

                    <!-- The extended global progress information -->

                    <div class="progress-extended">&nbsp;</div>

                </div>

            </div>

            <!-- The table listing the files available for upload/download -->

            <table role="presentation" class="table table-striped"><tbody class="files" data-toggle="modal-gallery" data-target="#modal-gallery"></tbody></table>

        </form>  

        <!-- The template to display files available for upload -->

        <script id="template-upload" type="text/x-tmpl">

        {% for (var i=0, file; file=o.files[i]; i++) { %}

            <tr class="template-upload fade">

                <td>

                    <span class="preview"></span>

                </td>

                <td>

                    <p class="name">{%=file.name%}</p>

                    {% if (file.error) { %}

                        <div><span class="label label-important">Error</span> {%=file.error%}</div>

                    {% } %}

                </td>

                <td>

                    <p class="size">{%=o.formatFileSize(file.size)%}</p>

                    {% if (!o.files.error) { %}

                        <div class="progress progress-success progress-striped active" role="progressbar" aria-valuemin="0" aria-valuemax="100" aria-valuenow="0"><div class="bar" style="width:0%;"></div></div>

                    {% } %}

                </td>

                <td>

                    {% if (!o.files.error && !i && !o.options.autoUpload) { %}

                        <button class="btn btn-primary start">

                            <i class="icon-upload icon-white"></i>

                            <span>Start</span>

                        </button>

                    {% } %}

                    {% if (!i) { %}

                        <button class="btn btn-warning cancel">

                            <i class="icon-ban-circle icon-white"></i>

                            <span>Cancel</span>

                        </button>

                    {% } %}

                </td>

            </tr>

        {% } %}

        </script>

        <!-- The template to display files available for download -->

        <script id="template-download" type="text/x-tmpl">

        {% for (var i=0, file; file=o.files[i]; i++) { %}

            <tr class="template-download fade">

                <td>

                    <span class="preview">

                        {% if (file.thumbnail_url) { %}

                            <a href="{%=file.url%}" title="{%=file.name%}" data-gallery="gallery" download="{%=file.name%}"><img src="{%=file.thumbnail_url%}"></a>

                        {% } %}

                    </span>

                </td>

                <td>

                    <p class="name">

                        <a href="{%=file.url%}" title="{%=file.name%}" data-gallery="{%=file.thumbnail_url&&'gallery'%}" download="{%=file.name%}">{%=file.name%}</a>

                    </p>

                    {% if (file.error) { %}

                        <div><span class="label label-important">Error</span> {%=file.error%}</div>

                    {% } %}

                </td>

                <td>

                    <span class="size">{%=o.formatFileSize(file.size)%}</span>

                </td>

                <td>

                    <button class="btn btn-danger delete" data-type="{%=file.delete_type%}" data-url="{%=file.delete_url%}"{% if (file.delete_with_credentials) { %} data-xhr-fields='{"withCredentials":true}'{% } %}>

                        <i class="icon-trash icon-white"></i>

                        <span>Delete</span>

                    </button>

                    <input type="checkbox" name="delete" value="1" class="toggle">

                </td>

            </tr>

        {% } %}

        </script>

    </div>

@section scripts

{

    <script src="~/Scripts/FileUpload/backload.demo.js"></script>

}

□ 结果：

上传2个文件：

这次，图片上传到了Uploads文件夹：

Uploads文件夹有刚上传的2个文件：

□ 如果想让web.config配置文件相对“干净”，可以把与Backload相关的配置放到单独的一个配置文件

web.config中可以这样：

   1:  <configuration>
   2:    <configSections>
   3:    ...
   4:    <section name="backload" type="Backload.Configuration.BackloadSection, Backload, Version=1.9.3.1, Culture=neutral, PublicKeyToken=02eaf42ab375d363" requirePermission="false" />
   5:    </configSections>
   6:    
   7:     <backload configSource="Web.Backload.config" />
   8:  </configuration>

.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }

根目录下的Web.Backload.config可以这样：

   1:  <?xml version="1.0"?>
   2:  <backload storageContext="Filesystem" xsi:noNamespaceSchemaLocation="Web.Backload.xsd" xmlns:name="urn:backload-schema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
   3:    <fileSystem filesRoot="~/Uploads" />
   4:  </backload>

.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }

参考资料：
※ http://backload.org/ Backload官网
※ https://github.com/blackcity/Backload#examples Backload例子
※ http://nuget.org/packages/Backload/ nuget上的Backload

※ http://blueimp.github.io/jQuery-File-Upload/ jQuery File Upload官网
※ https://github.com/blueimp/jQuery-File-Upload/wiki  github上的jQuery File Upload介绍
※ https://github.com/blueimp/jQuery-File-Upload  github上的jQuery File Upload源码

※ https://www.nuget.org/packages/JQueryFileUpload_Demo_with_Backload/  下载jQuery File Upload结合Backload的MVC案例

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