jquery – 文件API文件上传 – 在ASP.NET MVC中阅读XMLHttpRequest

我试图在ASP.NET MVC中实现Gmail风格的拖放文件上传。

我一直在关注这篇文章：http://robertnyman.com/html5/fileapi-upload/fileapi-upload.html，并希望将上传的文件发布到MVC控制器操作。

为此，我修改了链接中的示例JavaScript脚本以指向我的控制器操作：

xhr.open("post","/home/UploadFiles",true);

这是我的控制器动作：

[HttpPost]
public virtual string UploadFiles(object obj)
{
    var length = Request.ContentLength;
    var bytes = new byte[length];
    Request.InputStream.Read(bytes,length);
    // var bytes has byte content here. what do do next?

    return "Files uploaded!";
}

我设置一个断点，当我上传一个文件时，断点会被打 – 这是很好的。但是如何从上传的(JavaScript)XMLHttpRequest对象中提取数据？我不认为它在HttpRequest中 – 是参数吗？如果是这样，我期望什么类型的如何提取字节数组并从中提取上传的文件信息？

(我正在使用Chrome – 我知道它在IE中不起作用)

任何建议将不胜感激！

解决方法

弄清楚了。这是C#代码：

[HttpPost]
    public virtual string UploadFiles(object obj)
    {
        var length = Request.ContentLength;
        var bytes = new byte[length];
        Request.InputStream.Read(bytes,length);
        // bytes has byte content here. what do do next?

        var fileName = Request.Headers["X-File-Name"];
        var fileSize = Request.Headers["X-File-Size"];
        var fileType = Request.Headers["X-File-Type"];

        var savetoFileLoc = string.Format("{0}\\{1}",Server.MapPath("/Files"),fileName);

        // save the file.
        var fileStream = new FileStream(savetoFileLoc,FileMode.Create,FileAccess.ReadWrite);
        fileStream.Write(bytes,length);
        fileStream.Close();

        return string.Format("{0} bytes uploaded",bytes.Length);
    }

这里是Javascript代码：

<script type="text/javascript">
(function ()
{
    var filesupload = document.getElementById("files-upload");
    var dropArea = document.getElementById("drop-area");
    var fileList = document.getElementById("file-list");

    function uploadFile(file)
    {
        var li = document.createElement("li");
        var progressBarContainer = document.createElement("div");
        var progressBar = document.createElement("div");

        progressBarContainer.className = "progress-bar-container";
        progressBar.className = "progress-bar";
        progressBarContainer.appendChild(progressBar);
        li.appendChild(progressBarContainer);

        // Uploading - for Firefox,Google Chrome and Safari
        var xhr = new XMLHttpRequest();

        // Update progress bar
        xhr.upload.addEventListener("progress",function (evt)
        {
            if (evt.lengthComputable)
            {
                progressBar.style.width = (evt.loaded / evt.total) * 100 + "%";
            }
        },false);

        // File uploaded
        xhr.addEventListener("load",function ()
        {
            progressBarContainer.className += " uploaded";
            progressBar.innerHTML = "Uploaded!";
        },false);

        xhr.open("post","/home/UploadFile",true);

        // Set appropriate headers
        xhr.setRequestHeader("Content-Type","multipart/form-data");
        xhr.setRequestHeader("X-File-Name",file.fileName);
        xhr.setRequestHeader("X-File-Size",file.fileSize);
        xhr.setRequestHeader("X-File-Type",file.type);

        // Send the file
        xhr.send(file);

        // Present file info and append it to the list of files
        var div = document.createElement("div");
        li.appendChild(div);
        var fileInfo = "<div><strong>Name:</strong> " + file.name + "</div>";
        fileInfo += "<div><strong>Size:</strong> " + parseInt(file.size / 1024,10) + " kb</div>";
        fileInfo += "<div><strong>Type:</strong> " + file.type + "</div>";
        div.innerHTML = fileInfo;

        // insert at beginning of list.
        fileList.insertBefore(li,fileList.firstChild);

        // or insert at end of list.
        //fileList.appendChild(li);
    }

    function traverseFiles(files)
    {
        if (typeof files !== "undefined")
        {
            for (var i = 0,l = files.length; i < l; i++)
            {
                uploadFile(files[i]);
            }
        }
        else
        {
            fileList.innerHTML = "No support for the File API in this web browser";
        }
    }

    filesupload.addEventListener("change",function ()
    {
        traverseFiles(this.files);
    },false);

    dropArea.addEventListener("dragleave",function (evt)
    {
        var target = evt.target;

        if (target && target === dropArea)
        {
            this.className = "";
        }
        evt.preventDefault();
        evt.stopPropagation();
    },false);

    dropArea.addEventListener("dragenter",function (evt)
    {
        this.className = "over";
        evt.preventDefault();
        evt.stopPropagation();
    },false);

    dropArea.addEventListener("dragover",function (evt)
    {
        evt.preventDefault();
        evt.stopPropagation();
    },false);

    dropArea.addEventListener("drop",function (evt)
    {
        //document.getElementById("file-list").innerHTML = "";

        traverseFiles(evt.dataTransfer.files);
        this.className = "";
        evt.preventDefault();
        evt.stopPropagation();
    },false);
})();

原文地址：https://www.jb51.cc/jquery/182082.html