我正在尝试调试我不久前构建的异步文件上传器，它不再工作，我已经花了很多时间但没有成功。
服务器接收的流总是损坏，事实上我保存的文件（图像）无法打开。
为了简化调试，我设置了一个全新的 ASP.NET 项目，其中包含两个主要文件：带有表单字段的 HTML 文件和 ASP.NET 处理程序。
尽管这里的代码非常简单，但我仍然不走运！ :(
非常感谢任何帮助，非常感谢！
<!DOCTYPE html>
<html>
<head>
<title>Upload Files using XMLHttpRequest - Minimal</title>
<script type="text/javascript">
function uploadFile() {
var fd = new FormData();
fd.append("fileToUpload", document.getElementById('fileToUpload').files[0]);
var xhr = new XMLHttpRequest();
xhr.addEventListener("load", uploadComplete, false);
xhr.addEventListener("error", uploadFailed, false);
xhr.addEventListener("abort", uploadCanceled, false);
xhr.open("POST", "Handler1.ashx");
xhr.send(fd);
}
function uploadComplete(evt) {
/* This event is raised when the server send back a response */
alert(evt.target.responseText);
}
function uploadFailed(evt) {
alert("There was an error attempting to upload the file.");
}
function uploadCanceled(evt) {
alert("The upload has been canceled by the user or the browser dropped the connection.");
}
</script>
</head>
<body>
<form id="form1" enctype="multipart/form-data" method="post" action="Handler1.ashx">
<input type="file" name="fileToUpload" id="fileToUpload"/>
<input type="button" onclick="uploadFile()" value="Upload" />
</form>
</body>
</html>
这是 ashx 处理程序：
using System;
using System.Collections.Generic;
using System.Web.Extensions;
using System.Linq;
using System.Web;
using System.Web.Services;
using System.IO;
namespace MultipleFileUploadTest
{
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
public class Handler1 : IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
var stream = context.Request.InputStream;
MemoryStream memoryStream;
ReadFully(stream, out memoryStream);
Byte[] ba = memoryStream.ToArray();
var path = @"C:\Users\giuseppe.JHP\Desktop\Image upload test\uploaded.gif";
using (FileStream fs = new FileStream(path, FileMode.OpenOrCreate))
{
fs.Write(ba, 0, ba.Length);
}
//DEBUGGING CODE
//I'm opening the same file that was originally picked by the input form field and I'm now comparing the original file with the one received within the context stream. They always differ!
Byte[] ba2 = File.ReadAllBytes(@"C:\Users\giuseppe.JHP\Desktop\Image upload test\a.gif");
//equal evaluates always to false
bool equal = ba.Length == ba2.Length;
if (equal)
{
for (var i = 0; i < ba2.Length; i++)
{
if (ba[i] != ba2[i])
{
equal = false;
i = ba2.Length;
}
}
}
//equal is always false
//if (!equal)
//{
// throw Exception("Stream is not valid");
//}
//The code below will throw a Parameter is invalid exception
//System.Drawing.Image mediaObject = System.Drawing.Image.FromStream(memoryStream);
memoryStream.Close();
}
public static void ReadFully(Stream input, out MemoryStream ms)
{
ms = new MemoryStream();
byte[] buffer = new byte[16 * 1024];
int read;
while ((read = input.Read(buffer, 0, buffer.Length)) > 0)
{
ms.Write(buffer, 0, read);
}
}
public bool IsReusable
{
get
{
return false;
}
}
}
}
