C# 为什么我的数据没有在mvc4中更新？

当我要更新数据时，它会提醒我一个错误，如“状态=问题：无法更新客户端信息”。我在没有db.Update（ci）的情况下运行了此代码；代码，即使没有任何更新代码，它也会显示“已成功更新”。但当我使用更新方法时，它不会执行。我无法定义的问题在哪里。。。。这是我的控制器代码

public ActionResult Update(ClientInfo client, string id)
        {
            //Response.Write("Id : " + id + "<br>");
            //Response.Write("Country : " + client.Country + "<br>");
            try
            {
                //if (ModelState.IsValid)
                //{

                    ClientInfo ci = db.Single<ClientInfo>("Where CId=" + id);
                    if (ci != null)
                    {
                        ci.CName = client.CName.ToString();
                        ci.CCName = client.CCName.ToString();
                        ci.Address = client.Address.ToString();
                        ci.PhoneNo = Convert.ToInt32(client.PhoneNo.ToString());
                        ci.Fax = client.Fax.ToString();
                        ci.Email = client.Email.ToString();
                        ci.Country = client.Country.ToString();
                        ci.PostalCode = Convert.ToInt32(client.PostalCode.ToString());
                        //ci.Update();
                        db.Update(ci);
                        return Json(new { msg = "Successfully Updated."});
                    }
                    else
                        return Json(new { msg = "Fail to Update Client Info." });
                //}

                //return RedirectToAction("Index");
            }
            catch
            {
                return Json(new { msg = "Problem : Fail to Update Client Info." });
            }
        }

---

您没有正确地传递数据。您的链接也生成错误。由于您要向视图传递两个对象，因此最好在

ajax

data

对象中同时指定这两个对象：

var lk = "/Clients/Update/"; // => removed the CId
//alert("Test : Update " + lk + "\n" + client1.Country);
client = JSON.stringify(client1);

$.ajax({
      url: lk,
      type: 'POST',
      data: { client: client, id = CId } // => added an object containing all the expected parameters
      dataType: "json",
      success: function (data) {
          alert("Status = " + data.msg);
      },
      error: function (data) {
          alert("Error = " + data.msg);
      }
});

var lk = "/Clients/Update/"; // => removed the CId
//alert("Test : Update " + lk + "\n" + client1.Country);
client = JSON.stringify(client1);

$.ajax({
      url: lk,
      type: 'POST',
      data: { client: client, id = CId } // => added an object containing all the expected parameters
      dataType: "json",
      success: function (data) {
          alert("Status = " + data.msg);
      },
      error: function (data) {
          alert("Error = " + data.msg);
      }
});