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。
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: }
□ 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:
□ 其中用到了colorbox插件
install-package colorbox
□ FileUploadDerived/Index.cshtml视图
@{
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"> </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>
□ 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:
□ 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:
□ 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>
□ 结果
上传界面：
FileUpload文件夹：
FileUpload文件夹内容：