Java脚本

jqXHR = $.ajax({ url: $frm.attr("action"), type: "POST", dataType: "json", cache: false,
  headers: headers, contentType: "application/json;charset=UTF-8", data: ko.mapping.toJSON(data, map),
  beforeSend: function(x) {
    if (x && x.overrideMimeType) {
      return x.overrideMimeType("application/json;charset=UTF-8");
    }
  }
});

jqXHR.fail(function(xhr, err, msg) {  /* xhr.responseText  NEED TO BE JSON!!! */ });

在Chrome中

标头

Request Method:POST
Status Code:400 Bad Request
Request Headersview source
Accept:application/json, text/javascript, */*; q=0.01
Accept-Encoding:gzip,deflate,sdch
Accept-Language:en-US,en;q=0.8,pt-BR;q=0.6,pt;q=0.4
Connection:keep-alive
Content-Length:10
Content-Type:application/json;charset=UTF-8
User-Agent:Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/33.0.1750.117 Safari/537.36
X-Requested-With:XMLHttpRequest
Request Payloadview source {Id:0}
Response Headersview source
Cache-Control:private
Content-Length:54
Content-Type:application/json; charset=utf-8
Date:Thu, 27 Feb 2014 14:01:59 GMT
Server:Microsoft-IIS/8.0
X-AspNet-Version:4.0.30319
X-AspNetMvc-Version:5.1
X-Powered-By:ASP.NET

响应

[{“ Name”：“ Nome”，“ ErrorMessage”：“ campoobrigatório。”}]

适用于Chrome！

在IE8中

标头（请求）

POST /Motivos/Salvar HTTP/1.1
Accept: application/json, text/javascript, */*; q=0.01
Accept-Language: pt-br
x-requested-with: XMLHttpRequest
Content-Type: application/json;charset=UTF-8
Accept-Encoding: gzip, deflate
User-Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0)
Content-Length: 10
Connection: Keep-Alive
Pragma: no-cache

标头（响应）

HTTP/1.1 400 Bad Request
Cache-Control: private
Content-Type: text/html
Server: Microsoft-IIS/8.0
X-AspNetMvc-Version: 5.1
X-AspNet-Version: 4.0.30319
X-Powered-By: ASP.NET
Date: Thu, 27 Feb 2014 13:51:46 GMT
Content-Length: 11

Bad Request

不行！！

Asp.net MVC

过滤

public class HandleExceptionAttribute : HandleErrorAttribute
{
    public override void OnException(ExceptionContext filterContext)
    {
        if (filterContext.HttpContext.Request.IsAjaxRequest() && filterContext.Exception != null)
        {
            filterContext.HttpContext.Response.StatusCode = (int)HttpStatusCode.InternalServerError;
            var ex = filterContext.Exception.GetBaseException();
            filterContext.Result = new JsonResult
            {
                JsonRequestBehavior = JsonRequestBehavior.AllowGet,
                Data = new
                {
                    ex.Message,
                    ex.GetType().Name
                }
            };
            filterContext.ExceptionHandled = true;
        }
        else
        {
            base.OnException(filterContext);
        }
    }
}

应用于GlobalFilterCollection

控制者

[ValidateJsonAntiForgeryToken, HttpPost]
public virtual JsonResult Salvar(TViewModel viewModel)
{
    if (ModelState.IsValid)
    {
        TEntity model;
        if (default(TKey).Equals(viewModel.Id))
        {
            model = Mapper.Map<TEntity>(viewModel);
            AdicionarEntidade(model, viewModel);
        }
        else
        {
            model = Repositorio.Get(viewModel.Id);
            Mapper.Map(viewModel, model, typeof(TViewModel), typeof(TEntity));
            SalvarEntidade(model, viewModel);
        }

        return SalvarResult(model);
    }

    Response.StatusCode = 400;
    return Json(ModelState.ToJson(), JsonRequestBehavior.AllowGet);
}

延伸性

public static object ToJson(this ModelStateDictionary dic, params string[] othersMessages)
{
    var states = (from e in dic where e.Value.Errors.Count > 0
                  select new { Name = e.Key, e.Value.Errors[0].ErrorMessage }).ToList();

    if (othersMessages != null)
        foreach (var message in othersMessages)
            states.Add(new { Name = "", ErrorMessage = message });

    return states;
}

问题

• 为什么没有xhr.resposeText对象？
• 如何以与在Chrome中恢复相同的方式检索JSON？

我需要JSON来填充表单！

注意：03/11/2014

当我添加Response.TrySkipIisCustomErrors = true;控制器时，它就可以工作了！responseText返回json。为什么？