Question

I am trying to get my model from inside my web app, into a post Action. the only issue is that I get a model object which has 1 null variables inside :(. The action is:

[HttpPost]
[ValidateAntiForgeryHeader]
public async Task<JsonResult> StartRound(RoundModel model)

the models are as follow:

Edit: thanks to Nick Bailey, I started to find heaps of issues edits to the following:

removed Round as it wasn't needed
changed Matches to List as not sure if model constructor defaults Interfaces
changed OldId to int as that is the only type it will ever be and Json object had it as an int coming up to the action
changed SystemId and AdminAprovedWinnerId to nullable as both are expected to be able to be null
un-redacted all of constructors, I found out that I had no default constructor so therefore there was no way for it to be constructed
added default constructor as mentioned above

public class RoundModel
{
    public List<ClientMatch> Matches { get; set; } // null in action
}

public class ClientMatch
{
    public int OldId { get; set; }
    public string RoundName { get; set; }
    public string ServerName { get; set; }
    public string ServerPassword { get; set; }
    public string ServerMessage { get; set; }
    public Guid? SystemId { get; set; }
    public Guid? AdminAprovedWinnerId { get; set; }
    public Guid TeamAId { get; set; }
    public Guid TeamBId { get; set; }
    public int TeamAVote { get; set; }
    public int TeamBVote { get; set; }

    public ClientMatch()
    {

    }

    public ClientMatch(MatchWithTmpId noGuid)
    {
        ...
    }
}

As you will notice, the Round object is a Code First model with Virtual attributes. I have removed it from RoundModel just prior to uploading this question to test it, and removing it doesn't resolve the issue.

and my Ajax post

Edit: thanks to Nick Bailey, I started to find heaps of issues edits to the following:

SystemId now passes null as 0 cannot parse into GUID
TeamAVote, TeamBVote both passing through 1 (which coresponds to an enum)
Currently I have them nested inside of RoundModel as it was what I was last trying to get it working

POST http://localhost:52690/Admin/StartRound HTTP/1.1
Host: localhost:52690
Connection: keep-alive
Content-Length: 752
Accept: */*
Origin: http://localhost:52690
X-Requested-With: XMLHttpRequest
__RequestVerificationToken: TU5lBruq0K0FBxviWOS1GVjtRFw0edbCvE57bzh3wikqlXTw384jgxGBic61nMgUNwAXRgbf50cpk0naKADQgwnR9aNq1R55SSHj6UvszBRdfJ8nt362OFBQLC7eWLTwAwPJUVkRrFQkCOnZwtL6SQ2
User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.101 Safari/537.36
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
Referer: http://localhost:52690/Admin/MatchScheduler
Accept-Encoding: gzip, deflate
Accept-Language: en-US,en;q=0.8
Cookie: redacted

{
   "RoundModel":{
      "Matches":[
         {
            "SystemId":null,
            "OldId":0,
            "RoundName":"awd",
            "ServerName":"Apogawd0",
            "ServerPassword":"apog",
            "ServerMessage":"Can Team \"Lovin it\" please create server \"Apogawd0\" hosted in Oceania Servers, random map",
            "AdminAprovedWinnerId":null,
            "TeamAId":"74206e93-33aa-48d4-bac2-5f9acac0be90",
            "TeamBId":"35d4be62-4e3e-4575-8ce9-6c819382b50c",
            "TeamAVote":1,
            "TeamBVote":1
         }
      ]
   }
}

Any and all help appreciated, Cheers, Michael.

edit cont: I have made allot of changes thanks to Nick remdining me of the basics, haha I have spent too much time in JS land. Still getting null on Matches

Answer 1

你正在为你的圆形参数传递一个空对象，所以它自然就是null。 TeamAVote和TeamBVote在您的客户端匹配模型上是不可为空的字段，因此Jason序列化无法解析您发布的空值。我会让这些字段可以为空。

此外，为API模型和数据模型使用不同的模型通常是一个非常好的主意。通常不同的是共享代码成为问题。

Answer 2

最后一块拼图令人沮丧。我停止使用JSON作为表单数据并返回到我的原始js对象，突然，成功！所以我再次查看标题并确定：Content-Type: application/x-www-form-urlencoded; charset=UTF-8所以我进入了我的Ajax方法并添加了：contentType: "application/json"

最后:)成功，感谢Nick Bailey，是你让我走上正轨，所以我会给你答案。

请编辑您的问题以表明我的答案中有完整的答案，或者只是更新您的答案以包含解决方案。

再次感谢！

Getting Null from Ajax Post

2 个答案: