c#如何使用HTTP POST多部分/表单数据将文件上载到ashx
我正在尝试将一个大文件上载到Generic Handler FileUpload.ashx 我用Fiddler数据检查它,并以正确的方式到达服务器。但我无法在服务器端成功 我尝试了很多方法,但都无法将数据存储在数据库中 我试过旧的c#如何使用HTTP POST多部分/表单数据将文件上载到ashx,c#,asp.net,web-services,file-upload,ashx,C#,Asp.net,Web Services,File Upload,Ashx,我正在尝试将一个大文件上载到Generic Handler FileUpload.ashx 我用Fiddler数据检查它,并以正确的方式到达服务器。但我无法在服务器端成功 我尝试了很多方法,但都无法将数据存储在数据库中 我试过旧的 context.Request.Files[0]; context.Request.Params["file"] context.Request["file"]; 还有其他一些事情,现在我很困惑。在简单HTML中,仅设置类型文件并使用上面的第一个方法进行输入,这里复
context.Request.Files[0];
context.Request.Params["file"]
context.Request["file"];
还有其他一些事情,现在我很困惑。在简单HTML中,仅设置类型文件并使用上面的第一个方法进行输入,这里复杂吗?我必须为内容编写自己的解析器吗。难道没有更简单的方法吗
public void ProcessRequest(HttpContext context)
{
// what to do here
}
有人能为客户端和服务器端提供示例吗
顺便说一句,我的客户端是WinRt,服务器端是.Net 4.5,您可能想检查一下他们在这个项目中是如何做到这一点的: 以下是处理接收上载文件的主要代码:
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Web;
using System.Web.Script.Serialization;
namespace jQuery_File_Upload.MVC3.Upload
{
/// <summary>
/// Summary description for UploadHandler
/// </summary>
public class UploadHandler : IHttpHandler
{
private readonly JavaScriptSerializer js;
private string StorageRoot
{
get { return Path.Combine(System.Web.HttpContext.Current.Server.MapPath("~/Files/")); } //Path should! always end with '/'
}
public UploadHandler()
{
js = new JavaScriptSerializer();
js.MaxJsonLength = 41943040;
}
public bool IsReusable { get { return false; } }
public void ProcessRequest(HttpContext context)
{
context.Response.AddHeader("Pragma", "no-cache");
context.Response.AddHeader("Cache-Control", "private, no-cache");
HandleMethod(context);
}
// Handle request based on method
private void HandleMethod(HttpContext context)
{
switch (context.Request.HttpMethod)
{
case "HEAD":
case "GET":
if (GivenFilename(context)) DeliverFile(context);
else ListCurrentFiles(context);
break;
case "POST":
case "PUT":
UploadFile(context);
break;
case "DELETE":
DeleteFile(context);
break;
case "OPTIONS":
ReturnOptions(context);
break;
default:
context.Response.ClearHeaders();
context.Response.StatusCode = 405;
break;
}
}
private static void ReturnOptions(HttpContext context)
{
context.Response.AddHeader("Allow", "DELETE,GET,HEAD,POST,PUT,OPTIONS");
context.Response.StatusCode = 200;
}
// Delete file from the server
private void DeleteFile(HttpContext context)
{
var filePath = StorageRoot + context.Request["f"];
if (File.Exists(filePath))
{
File.Delete(filePath);
}
}
// Upload file to the server
private void UploadFile(HttpContext context)
{
var statuses = new List<FilesStatus>();
var headers = context.Request.Headers;
if (string.IsNullOrEmpty(headers["X-File-Name"]))
{
UploadWholeFile(context, statuses);
}
else
{
UploadPartialFile(headers["X-File-Name"], context, statuses);
}
WriteJsonIframeSafe(context, statuses);
}
// Upload partial file
private void UploadPartialFile(string fileName, HttpContext context, List<FilesStatus> statuses)
{
if (context.Request.Files.Count != 1) throw new HttpRequestValidationException("Attempt to upload chunked file containing more than one fragment per request");
var inputStream = context.Request.Files[0].InputStream;
var fullName = StorageRoot + Path.GetFileName(fileName);
using (var fs = new FileStream(fullName, FileMode.Append, FileAccess.Write))
{
var buffer = new byte[1024];
var l = inputStream.Read(buffer, 0, 1024);
while (l > 0)
{
fs.Write(buffer, 0, l);
l = inputStream.Read(buffer, 0, 1024);
}
fs.Flush();
fs.Close();
}
statuses.Add(new FilesStatus(new FileInfo(fullName)));
}
// Upload entire file
private void UploadWholeFile(HttpContext context, List<FilesStatus> statuses)
{
for (int i = 0; i < context.Request.Files.Count; i++)
{
var file = context.Request.Files[i];
var fullPath = StorageRoot + Path.GetFileName(file.FileName);
file.SaveAs(fullPath);
string fullName = Path.GetFileName(file.FileName);
statuses.Add(new FilesStatus(fullName, file.ContentLength, fullPath));
}
}
private void WriteJsonIframeSafe(HttpContext context, List<FilesStatus> statuses)
{
context.Response.AddHeader("Vary", "Accept");
try
{
if (context.Request["HTTP_ACCEPT"].Contains("application/json"))
context.Response.ContentType = "application/json";
else
context.Response.ContentType = "text/plain";
}
catch
{
context.Response.ContentType = "text/plain";
}
var jsonObj = js.Serialize(statuses.ToArray());
context.Response.Write(jsonObj);
}
private static bool GivenFilename(HttpContext context)
{
return !string.IsNullOrEmpty(context.Request["f"]);
}
private void DeliverFile(HttpContext context)
{
var filename = context.Request["f"];
var filePath = StorageRoot + filename;
if (File.Exists(filePath))
{
context.Response.AddHeader("Content-Disposition", "attachment; filename=\"" + filename + "\"");
context.Response.ContentType = "application/octet-stream";
context.Response.ClearContent();
context.Response.WriteFile(filePath);
}
else
context.Response.StatusCode = 404;
}
private void ListCurrentFiles(HttpContext context)
{
var files =
new DirectoryInfo(StorageRoot)
.GetFiles("*", SearchOption.TopDirectoryOnly)
.Where(f => !f.Attributes.HasFlag(FileAttributes.Hidden))
.Select(f => new FilesStatus(f))
.ToArray();
string jsonObj = js.Serialize(files);
context.Response.AddHeader("Content-Disposition", "inline; filename=\"files.json\"");
context.Response.Write(jsonObj);
context.Response.ContentType = "application/json";
}
}
}
使用System.Collections.Generic;
使用System.IO;
使用System.Linq;
使用System.Web;
使用System.Web.Script.Serialization;
命名空间jQuery\u文件\u Upload.MVC3.Upload
{
///
///UploadHandler的摘要说明
///
公共类UploadHandler:IHttpHandler
{
私有只读JavaScriptSerializer js;
私有字符串存储根
{
获取{return Path.Combine(System.Web.HttpContext.Current.Server.MapPath(“~/Files/”);}//Path应该!始终以“/”结尾
}
公共上传处理程序()
{
js=新的JavaScriptSerializer();
js.MaxJsonLength=41943040;
}
公共布尔可重用{get{return false;}}
公共void ProcessRequest(HttpContext上下文)
{
AddHeader(“Pragma”,“无缓存”);
AddHeader(“缓存控制”,“私有,无缓存”);
HandleMethod(上下文);
}
//基于方法处理请求
私有void HandleMethod(HttpContext上下文)
{
开关(context.Request.HttpMethod)
{
案例“头”:
案例“GET”:
if(GivenFilename(context))DeliverFile(context);
else ListCurrentFiles(上下文);
打破
案例“职位”:
案例“付诸表决”:
上传文件(上下文);
打破
案例“删除”:
删除文件(上下文);
打破
案例“选项”:
返回选项(上下文);
打破
违约:
context.Response.ClearHeaders();
context.Response.StatusCode=405;
打破
}
}
私有静态void ReturnOptions(HttpContext上下文)
{
AddHeader(“允许”、“删除、获取、HEAD、POST、PUT、OPTIONS”);
context.Response.StatusCode=200;
}
//从服务器上删除文件
私有void DeleteFile(HttpContext上下文)
{
var filePath=StorageRoot+context.Request[“f”];
if(File.Exists(filePath))
{
File.Delete(文件路径);
}
}
//将文件上载到服务器
私有void上载文件(HttpContext上下文)
{
变量状态=新列表();
var headers=context.Request.headers;
if(string.IsNullOrEmpty(头[“X-File-Name”]))
{
UploadWholeFile(上下文、状态);
}
其他的
{
UploadPartialFile(标题[“X-File-Name”]、上下文、状态);
}
WriteJsonIframeSafe(上下文、状态);
}
//上载部分文件
私有void UploadPartialFile(字符串文件名、HttpContext上下文、列表状态)
{
如果(context.Request.Files.Count!=1)抛出新的HttpRequestValidationException(“尝试上载每个请求包含多个片段的分块文件”);
var inputStream=context.Request.Files[0]。inputStream;
var fullName=StorageRoot+Path.GetFileName(文件名);
使用(var fs=new FileStream(全名、FileMode.Append、FileAccess.Write))
{
var buffer=新字节[1024];
var l=inputStream.Read(缓冲区,0,1024);
而(l>0)
{
fs.写入(缓冲区,0,l);
l=inputStream.Read(缓冲区,0,1024);
}
fs.Flush();
fs.Close();
}
添加(新文件状态(新文件信息(全名));
}
//上载整个文件
私有void UploadWholeFile(HttpContext上下文,列表状态)
{
for(int i=0;ipublic void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "text/plain";
// *Very Important* Security checks need to go here (is the user authorised to upload.. And do we want to restrict filetypes eg. executable scripts to prevent common hacking attempts)
// This can be done via prior security checks and setting a session variable as such:
// if ((bool)Session["ValidatedUser"] != true) throw new Exception("Invalid Permissions");
// Check if file has been sent
if (context.Request.Files.Count > 0)
{
// Save uploaded file
HttpPostedFile uploadedFile = context.Request.Files[0];
uploadedFile.SaveAs("D:/MyUploadFolder/" + uploadedFile.FileName);
context.Response.Write("OK");
}
else
context.Response.Write("No file attached");
}