jQuery ajax成功响应是{location：null}

Question

我面临一些网络服务问题。我在Web服务中指定了文件上传代码。但是，当我尝试从cshtml页面调用Web服务（asmx）时，我得到的是{location:null}响应消息。

这是我尝试调用Web服务的javascript。

function uploadFiles(event)
{
  event.stopPropagation();
  event.preventDefault();           

    // Create a formdata object and add the files
    var data = new FormData();          

    for (var i = 0; i < files.length; i++) {  
        data.append("UploadedFile", files[i]);  
    }   

    var ajaxRequest = $.ajax({              
        type: "POST",
        url: "/admin/public/webservices/fileupload/fileUpload.asmx/UploadFile",
        contentType: false,
        processData: false,
        data: data,
        success: function (response, textStatus){
            alert(JSON.stringify(response));                    
        },
        error: function(jqXHR, exception, errorThrown){                 
            alert(jqXHR.status + " : " + errorThrown);
        },
        failure: function (r) {                    
            alert(r.responseText);
        }
    });
}

这是我的网络服务。

[WebMethod]
public string UploadFile()
{
    try
    {
        var httpPostedFile = HttpContext.Current.Request.Files["UploadedFile"];
        if (httpPostedFile != null)
        {
            try
            {
                // Get the complete file path
                var fileSavePath = Path.Combine(HttpContext.Current.Server.MapPath("~/Files/Integration/ImportUser"), httpPostedFile.FileName);

                // Save the uploaded file to "UploadedFiles" folder
                httpPostedFile.SaveAs(fileSavePath);

                return "File Uploaded Successfully!";
            }
            catch (Exception ex)
            {
                return "Error occurred. Error details: " + ex.Message;
            }
        }
        else
        {
            return "No files selected.";
        }
    }
    catch (Exception ex)
    {
        return ex.Message;
        throw;
    }            
}

我也取消注释[System.Web.Script.Services.ScriptService]。我无法弄清楚问题所在。感谢。