Javascript 如何将int与int模型json和MVC4进行比较

我尝试将参数接收的int变量与DB中的int字段进行比较

控制器中的功能：

[AcceptVerbs(HttpVerbs.Get)]
    public JsonResult getServicoID(string serie, int numDoc)
    {
        try
        {
            var result = db.Servicos.Where(dados => dados.DadosComerciais.Serie == serie && dados.DadosComerciais.NumDoc == numDoc); // i think the problem is here - dados.DadosComerciais.NumDoc == numDoc
            return Json(result, JsonRequestBehavior.AllowGet);
        }
        catch (Exception ex)
        {
            return Json(new { Result = "ERROR", Message = ex.Message }, JsonRequestBehavior.AllowGet);
        }
    }

[AcceptVerbs(HttpVerbs.Get)]
    public JsonResult getServicoID(string serie, int numDoc)
    {
        try
        {
            var result = db.Servicos.FirstOrDefault(dados => dados.DadosComerciais.Serie == serie && dados.DadosComerciais.NumDoc == numDoc);

            return Json(result.ServicosID, JsonRequestBehavior.AllowGet);
        }
        catch (Exception ex)
        {
            return Json(new { Result = "ERROR", Message = ex.Message }, JsonRequestBehavior.AllowGet);
        }
    }

功能js：

function AddServContratado() {
//Buscar ServicoID da tabela servicos para guardar na ServicoContratado

$.getJSON("/Contrato/getServicoID", { serie: $("#Serie").val(), numDoc: $("#NumDoc").val() },
      function (result) {
          var servicoID = result.ServicosID;
          alert(result.ServicosID);
      });

---

您正在从控制器操作返回列表。

result

变量是一个

IEnumerable

在javascript文件中，您试图使用一些

result.ServicosID

属性，这些属性无法工作，因为您有一个对象列表。例如，您可以这样访问它们：

result[0].ServicosID

如果要访问单个对象，请确保已从控制器操作返回单个对象：

[AcceptVerbs(HttpVerbs.Get)]
public ActionResult GetServicoID(string serie, int numDoc)
{
    try
    {
        var result = db.Servicos.FirstOrDefault(dados => dados.DadosComerciais.Serie == serie && dados.DadosComerciais.NumDoc == numDoc);
        if (result == null)
        {
            // no object found in the database that matches the criteria => 404
            return HttpNotFound();
        }
        return Json(result, JsonRequestBehavior.AllowGet);
    }
    catch (Exception ex)
    {
        Response.StatusCode = 500;
        return Json(new { Result = "ERROR", Message = ex.Message }, JsonRequestBehavior.AllowGet);
    }
}

我找到了解决办法：

控制器：

[AcceptVerbs(HttpVerbs.Get)]
    public JsonResult getServicoID(string serie, int numDoc)
    {
        try
        {
            var result = db.Servicos.Where(dados => dados.DadosComerciais.Serie == serie && dados.DadosComerciais.NumDoc == numDoc); // i think the problem is here - dados.DadosComerciais.NumDoc == numDoc
            return Json(result, JsonRequestBehavior.AllowGet);
        }
        catch (Exception ex)
        {
            return Json(new { Result = "ERROR", Message = ex.Message }, JsonRequestBehavior.AllowGet);
        }
    }

[AcceptVerbs(HttpVerbs.Get)]
    public JsonResult getServicoID(string serie, int numDoc)
    {
        try
        {
            var result = db.Servicos.FirstOrDefault(dados => dados.DadosComerciais.Serie == serie && dados.DadosComerciais.NumDoc == numDoc);

            return Json(result.ServicosID, JsonRequestBehavior.AllowGet);
        }
        catch (Exception ex)
        {
            return Json(new { Result = "ERROR", Message = ex.Message }, JsonRequestBehavior.AllowGet);
        }
    }

Js:

---

错误的上下文是什么？我尝试返回单个对象。此字段是DadosComerciais中的主键和Servicos中的外键，将只返回单个对象结果，然后按照Darin的建议执行，或者简单地将.FirstOrDefault（）添加到linq中。Where（）将返回一个列表，无论您是否有单个结果。@CésarCação，您注意到我的答案中的

FirstOrDefault

？