如何使用XmlHttpRequest和ASP.NET MVC处理文件上传错误？

Question

for simplicity:

client:

var xrh = new XmlHttpRequest();
...
xrh.onerror = on_upload_error;
xrh.send(...)

server:

public class file_transfer
{
    [HttpPost]
    public void Upload(HttpPostedFileBase[] files_to_upload)
    {
        ...
        if (succeeded)
        {
            // what should I to to let the client know the success? in onload
        }
        else
        {
            // what should I to to let the client know the failaure? maybe in onerror
        }
    }
}

what should I to to let the client know the success? in onload?

what should I to to let the client know the failaure? maybe in onerror?

Answer 1

You can return http success/failed code to client:

[HttpPost]
public ActionResult Upload(HttpPostedFileBase[] files_to_upload)
{
    ...
    if (succeeded)
    {
        return new HttpStatusCodeResult(200);
    }
    else
    {
        return new HttpStatusCodeResult(400);
    }
}