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当我在 iOS 模拟器上运行这段代码时，这段代码可以完美运行。当我在设备上运行它时，我的 MVC3 控制器上的文件计数为零。

这是我的目标 C 代码

// create request
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];                                    
[request setCachePolicy:NSURLRequestReloadIgnoringLocalCacheData];
[request setHTTPShouldHandleCookies:YES];
[request setTimeoutInterval:30];
[request setHTTPMethod:@"POST"];

 NSString *boundary = @"WebKitFormBoundaryAFokZJl5GNWFRG28";

// set Content-Type in HTTP header
NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@", boundary];
[request setValue:contentType forHTTPHeaderField: @"Content-Type"];

NSMutableData *body = [NSMutableData data];
[body appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"patid\"\r\n\r\n %@", _patID] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:@"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"apicall\"\r\n\r\n %@", @"yes"] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:@"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];

// add image data
NSData *imageData = UIImageJPEGRepresentation(image, 1.0);
if (imageData) {
    [body appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"file\"; filename=\"image.jpg\"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[[NSString stringWithString:@"Content-Type: image/jpeg\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:imageData];
    [body appendData:[[NSString stringWithFormat:@"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
}

[body appendData:[[NSString stringWithFormat:@"--%@--\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];

// setting the body of the post to the reqeust
[request setHTTPBody:body];

// set the content-length
NSString *postLength = [NSString stringWithFormat:@"%d", [body length]];
[request setValue:postLength forHTTPHeaderField:@"Content-Length"];

NSMutableString *sURL;

sURL = _postURL;

NSURL *url = [[NSURL alloc]initWithString:sURL];
[request setURL:url];

NSData *returnData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
NSString *returnString = [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding];

NSLog(@"%@", returnString);

我的 ASP.NET MVC3 控制器方法

    [HttpPost]
    public ActionResult Create(HttpPostedFileBase file)
    {
        if (file != null && file.ContentLength > 0)
        {
            var fileName = Path.GetFileName(file.FileName);
            var path = Path.Combine(Server.MapPath("~/images/id"), fileName);
            file.SaveAs(path);
        }
        return View();
    }

当我从模拟器运行它时，我在 MVC3 控制器上获取文件（HttpPostedFileBase 不为空）。当我从设备运行相同的代码时，文件为 NULL。

难道我做错了什么？有人可以帮帮我吗...

编辑- 谢谢@Martin，你给了我线索。

我发现了由我的公司代理服务器引起的奇怪问题。按照您的建议，我试图在 Windows 机器上设置一个 Fiddler 实例并将其配置为 iPAD 的代理。令人惊讶的是，当我在公司代理上重新尝试时，我的上传功能没有问题 - 它失败了。我会尽快解决的。非常感谢您的回复@Martin R ...非常感谢。

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