如何使用 XmlHttpRequest 和 asp.net mvc 处理文件上传错误？

Question

为简单起见：

客户：

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

服务器：

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
        }
    }
}

我应该怎么做才能让客户知道成功？正在加载中？

我应该怎么做才能让客户知道失败？可能是onerror？

Answer 1

您可以向客户端返回http成功/失败代码：

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