当需要在控制器中处理除了文件的其他表单字段，执行控制器独有的业务逻辑......等等，这时候我们可以自定义控制器。

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  
MVC文件上传05-使用客户端jQuery-File-Upload插件和服务端Backload组件自定义上传文件夹

通过继承BackloadController

□ 思路

BackloadController的HandleRequestAsync()方法可以用来处理异步请求，通过继承BackloadController，子类也有了处理异步文件请求的能力。客户端方面，需要一个指向自定义控制器的初始化js文件。

□ FileUploadDerivedController继承BackloadController

   1:      public class FileUploadDerivedController : BackloadController
   2:      {
   3:          public ActionResult Index()
   4:          {
   5:              return View();
   6:          }
   7:   
   8:          public async Task<ActionResult> FileHandler()
   9:          {
  10:              ActionResult result = await base.HandleRequestAsync();
  11:              return result;
  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; }

□ 创建一个指向自定义控制器的js文件main.js

   1:  $(function () {
   2:      'use strict';
   3:   
   4:      var fileUploadUrl = "/FileUploadDerived/FileHandler";
   5:   
   6:      // Initialize the jQuery File Upload widget:
   7:      $('#fileupload').fileupload({
   8:          url: fileUploadUrl,
   9:          acceptFileTypes: /(jpg)|(jpeg)|(png)|(gif)$/i // Allowed file types
  10:      });
  11:   
  12:      // Optional: Initial ajax request to load already existing files.
  13:      $.ajax({
  14:          url: fileUploadUrl,
  15:          dataType: 'json',
  16:          context: $('#fileupload')[0]
  17:      })
  18:      .done(function (result) {
  19:          $(this).fileupload('option', 'done')
  20:              .call(this, null, { result: result });
  21:          // Attach the Colorbox plugin to the image files to preview them in a modal window. Other file types (e.g. pdf) will show up in a 
  22:          // new browser window.
  23:          $(".files tr[data-type=image] a").colorbox();
  24:      });
  25:   
  26:   
  27:      // Initialize the jQuery ui theme switcher:
  28:      $('#theme-switcher').change(function () {
  29:          var theme = $('#theme');
  30:          theme.prop(
  31:              'href',
  32:              theme.prop('href').replace(
  33:                  /[\w\-]+\/jquery-ui.css/,
  34:                  $(this).val() + '/jquery-ui.css'
  35:              )
  36:          );
  37:      });
  38:  });
  39:   
  40:   
  41:  $("document").ready(function () {
  42:      // The Colorbox plugin needs to be informed on new uploaded files in the template in order to bind a handler to it. 
  43:      // There must be a little delay, because the fileuploaddone event is triggered before the new template item is created.
  44:      // A more elegant solution would be to use jQuery's delegated .on method, which automatically binds to the anchors in a
  45:      // newly created template item, and then call colorbox manually.
  46:      $('#fileupload').bind('fileuploaddone', function(e, data) {
  47:          setTimeout(function() { $(".files tr[data-type=image] a").colorbox() }, 1000);
  48:      });
  49:  });    
  50:   

.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; }

□ 其中用到了colorbox插件

install-package colorbox

□ FileUploadDerived/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>*@

    <script src="~/Scripts/main.js"></script>

}

□ 在web.config中设置目的文件夹CustomerController

   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="~/CustomerController" />
   9:    </backload>
  10:  </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; }

□ 结果

上传界面：

CustomerController文件夹：

CustomerController文件夹内容：

通过为FileUploadHandler的事件IncomingRequestStarted注册方法

□ 思路

为FileUploadHandler的事件IncomingRequestStarted注册方法，再让事件处理异步文件请求。客户端方面，需要一个指向自定义控制器的初始化js文件。

□ FileUploadInstanceController

   1:     public class FileUploadInstanceController : Controller
   2:      {
   3:          public ActionResult Index()
   4:          {
   5:              return View();
   6:          }
   7:   
   8:          public async Task<ActionResult> FileHandler()
   9:          {
  10:              FileUploadHandler handler = new FileUploadHandler(Request, this);
  11:              handler.IncomingRequestStarted += handler_IncomingRequestStarted;
  12:              ActionResult result = await handler.HandleRequestAsync();
  13:              return result;
  14:          }
  15:   
  16:          void handler_IncomingRequestStarted(object sender, Backload.Eventing.Args.IncomingRequestEventArgs e)
  17:          {
  18:              //禁止添加操作
  19:              if (e.Context.HttpMethod == "PUT")
  20:              {
  21:                  e.Context.PipelineControl.ExecutePipeline = false;
  22:              }
  23:          }
  24:      }
  25:   

.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; }

□ 创建一个指向自定义控制器的js文件main.js

   1:  $(function () {
   2:      'use strict';
   3:   
   4:      var fileUploadUrl = "/FileUploadInstance/FileHandler";
   5:   
   6:   
   7:      // Initialize the jQuery File Upload widget:
   8:      $('#fileupload').fileupload({
   9:          url: fileUploadUrl,
  10:          acceptFileTypes: /(jpg)|(jpeg)|(png)|(gif)$/i // Allowed file types
  11:      });
  12:   
  13:      // Optional: Initial ajax request to load already existing files.
  14:      $.ajax({
  15:          url: fileUploadUrl,
  16:          dataType: 'json',
  17:          context: $('#fileupload')[0]
  18:      })
  19:      .done(function (result) {
  20:          $(this).fileupload('option', 'done')
  21:              .call(this, null, { result: result });
  22:          // Attach the Colorbox plugin to the image files to preview them in a modal window. Other file types (e.g. pdf) will show up in a 
  23:          // new browser window.
  24:          $(".files tr[data-type=image] a").colorbox();
  25:      });
  26:   
  27:   
  28:   
  29:      // Initialize the jQuery ui theme switcher:
  30:      $('#theme-switcher').change(function () {
  31:          var theme = $('#theme');
  32:          theme.prop(
  33:              'href',
  34:              theme.prop('href').replace(
  35:                  /[\w\-]+\/jquery-ui.css/,
  36:                  $(this).val() + '/jquery-ui.css'
  37:              )
  38:          );
  39:      });
  40:  });
  41:   
  42:   
  43:  $("document").ready(function () {
  44:      // The Colorbox plugin needs to be informed on new uploaded files in the template in order to bind a handler to it. 
  45:      // There must be a little delay, because the fileuploaddone event is triggered before the new template item is created.
  46:      // A more elegant solution would be to use jQuery's delegated .on method, which automatically binds to the anchors in a
  47:      // newly created template item, and then call colorbox manually.
  48:      $('#fileupload').bind('fileuploaddone', function(e, data) {
  49:          setTimeout(function() { $(".files tr[data-type=image] a").colorbox() }, 1000);
  50:      });
  51:  });    
  52:   

.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; }

□ FileUploadInstance/Index.cshtml视图

同上

□ 在web.config中设置目的文件夹FileUpload

   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="~/FileUpload" />
   9:    </backload>
  10:  </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; }

□ 结果

上传界面：

FileUpload文件夹：

FileUpload文件夹内容：

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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