如何处理在ASP.NET MVC HTML5多文件上传？ [英] How do I handle HTML5 Multiple File uploads in ASP.NET MVC?

问题描述

我找到了<一href="http://stackoverflow.com/questions/166221/how-can-i-upload-files-asynchronously-with-jquery/8758614#8758614">following大螺纹与如何使用新的HTML5 API FORMDATA通过AJAX / jQuery的做文件上传的解释

I found the following great thread with an explanation of how to do file uploads through AJAX/Jquery using the new HTML5 FormData API

下面是一个code稍微更新的版本，与新的JQuery 1.8+语法

Here's a slightly updated version of that code, with the newer JQuery 1.8+ syntax

$(':button').click(function(){
    var formData = new FormData($('form')[0]);
    $.ajax({
        url: '/Upload',  //my ASP.NET MVC method
        type: 'POST',
        // handle the progress report
        xhr: function() {  // Custom XMLHttpRequest
            var myXhr = $.ajaxSettings.xhr();
            if(myXhr.upload){ // Check if upload property exists
                myXhr.upload.addEventListener('progress',progressHandlingFunction,    false); // For handling the progress of the upload
            }
            return myXhr;
        },

        // Form data
        data: formData,

        //Options to tell jQuery not to process data or worry about content-type.
        cache: false,
        contentType: false,
        processData: false
    })
    .done(function(){
        alert("success");
    })
    .fail(function(){
        alert("error");
    });
});

function progressHandlingFunction(e){
    if(e.lengthComputable){
        $('progress').attr({value:e.loaded,max:e.total});
    }
}

和这里的形式

<form enctype="multipart/form-data">
    <input name="file" type="file" />
    <input type="button" value="Upload" />
</form>
<progress></progress>

在服务器端，我们有这样的事情。

On the server side, we have something like this.

[HttpPost]
public string Upload(HttpPostedFileBase file)
{
    // do something with file
    return "you uploaded a file called " + file.FileName;
}

这伟大工程。除非你决定使用该文件对话框上的多属性，并发送多个文件。

This works great. UNTIL you decide to use the "multiple" attribute on the file dialog, and send multiple files.

<form enctype="multipart/form-data">
    <input name="file" type="file" multiple="multiple" />
    <input type="button" value="Upload" />
</form>
<progress></progress>

您会发现不同的网页在线提示如下解决方案

You'll find various pages online suggesting the following solutions

public string Upload(IEnumerable<HttpPostedFileBase> files)
{
    foreach(var file in files)
         ...
}

抱歉。不工作

Oops. Doesn't work

public string Upload(List<HttpPostedFileBase> files)
{
    foreach(var file in files)
         ...
}

都能跟得上。不工作。

Nope. Doesn't work.

public string Upload(IEnumerable files)
{
    foreach(var file in files)
         ...
}

甚至没有的编译的

public string Upload(HttpPostedFileBase[] files)
{
    foreach(HttpPostedFileBase file in files)
         ...
}

你猜怎么着？不工作。让我们试着用Request.Files处理代替。好老可靠Request.Files。永远不会失败。

Guess what? Doesn't work. Lets try dealing with Request.Files instead. Good old reliable Request.Files. Never fails.

public string Upload()
{
    foreach (HttpPostedFileBase uf in Request.Files)
         ...
}

剧透：这是行不通的。

Spoiler alert: It Doesn't work.

啊哈。得到它了！我会遍历在Request.Files代替钥匙。

Aha. Got it! I'll iterate over the keys in Request.Files instead.

public string Upload()
{
    foreach(var key in Request.Files.AllKeys)
    {
        var file = Request.Files[key];
    }
}

再次，这是行不通的。

Yet again, it doesn't work.

推荐答案

什么的确实的工作，是下面的，<一个href="http://weblog.west-wind.com/posts/2012/Mar/06/Using-the-HTML5-input-typefile-multiplemultiple-Tag-in-ASPNET">from总是可靠，动态的头发里克施特拉尔的博客

What does work, is the following, from the blog of the always dependable and dynamically haired Rick Strahl

public string Upload()
{
    for (int i = 0; i < Request.Files.Count; i++)
    {
        var file = Request.Files[i];
    } 
}

这背后的原因是，传递给 Request.Files 文件的集合所有具有相同名称，因为他们来自一个单一的文件上传对话框。

The reason behind this is that the collection of files passed to Request.Files all have the same name, because they come from a singular file upload dialog.

服务器端方法传递一个的单的包含文件的对象，出于某种原因，Request.Files是得到它的唯一途径。

the server side method is passed a single object containing the files, and for some reason Request.Files is the only way to get at it.

希望我在加入这个救别人有点头疼。

Hopefully I've saved someone a bit of headache by adding this in.

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