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custom response object for model validation in asp.net core

I want custom object in response of API having [required] data annotation on model properties like this:
{
"resourceType": "OperationOutcome",
"issue": [
{
"severity": "fatal",
"code": "required",
"location": [
"/f:AllergyIntolerance/f:status"
]
}
]
}
Is it possible to do it or I would have to code it.
Because model validation happens before action is called, is there any way I can do it?

To create custom request and respond samples for your api, you can use Swashbuckle.AspNetCore.Swagger and to improve validations on your models you can use FluentValidations Sample. Good Luck!

first for simplify define your models like these :
public class ResponseModel
{
public string resourceType { get; set; }
public List<ResponseIssueModel> issue { get; set; } = new List<ResponseIssueModel>();
}
public class ResponseIssueModel
{
public string severity { get; set; }
public string code { get; set; }
public List<string> locations { get; set; } = new List<string>();
}
Then on your actions you can return this :
var response = new ResponseModel();
response.resourceType = "OperationOutcome";
response.issue.Add(new ResponseIssueModel
{
severity = "fatal",
code = "required",
locations = { "/f:AllergyIntolerance/f:status" }
});
return Ok(response);
you can use Builder Pattern for easy create response object

If you want to validate your model in controller,you could try with TryValidateModel method as mentioned in the document:
I tried as below:
in controller:
var model = new TestModel() { Id=1,nestedModels=new List<NestedModel>() { new NestedModel() { Prop1="P11"} } };
var isvalid=TryValidateModel(model);
var errorfiledlist = new List<string>();
if (!isvalid)
{
foreach (var value in ModelState.Values)
{
foreach (var error in value.Errors)
{
errorfiledlist.Add(MidStrEx(error.ErrorMessage,"The "," field"));
}
}
}
var jsonstring = JsonSerializer.Serialize(model);
foreach (var field in errorfiledlist)
{
var oldstr = String.Format("\"{0}\":null", field);
var newstr = String.Format("\"{0}\":\"required\"", field);
jsonstring = jsonstring.Replace(oldstr, newstr);
};
var obj = JsonSerializer.Deserialize<Object>(jsonstring);
return Ok(obj);
MidStrEx method:
public static string MidStrEx(string sourse, string startstr, string endstr)
{
string result = string.Empty;
int startindex, endindex;
try
{
startindex = sourse.IndexOf(startstr);
if (startindex == -1)
return result;
string tmpstr = sourse.Substring(startindex + startstr.Length);
endindex = tmpstr.IndexOf(endstr);
if (endindex == -1)
return result;
result = tmpstr.Remove(endindex);
}
catch (Exception ex)
{
}
return result;
}
Models：
public class TestModel
{
public int Id { get; set; }
[Required]
public string Prop { get; set; }
public List<NestedModel> nestedModels { get; set; }=new List<NestedModel>();
}
public class NestedModel
{
public string Prop1 { get; set; }
[Required]
public string Prop2 { get; set; }
}
The result：

How to extract data from JSON array

I know its an array, but I am completely new to JSON and need help comprehending how this is structured, here is my attempt at extracting data:
String JSonString = readURL("//my URL is here");
JSONArray s = JSONArray.fromObject(JSonString);
JSONObject Data =(JSONObject)(s.getJSONObject(0));
System.out.println(Data.get("RecycleSiteUrl"));
I want to extract RecycleSiteUrl based on SiteId
My JSON data that I have goes like this :
[
{
"SiteId": 1,
"RecycleLogoUrl": "https://static-contrado.s3-eu-west- 1.amazonaws.com/cms/recyclecarelabel/d867c499-abc0-4ade-bc1a-f5011032c3e0132901511939451201.jpeg",
"RecycleSiteUrl": "bagsoflove.co.uk/recycling",
"Culture": "en-GB"
},
{
"SiteId": 10,
"RecycleLogoUrl": "https://static-contrado.s3-eu-west-1.amazonaws.com/cms/recyclecarelabel/95d28588-33e3-420c-8b24-4a8095c0f6ac132901511364264751.jpeg",
"RecycleSiteUrl": "contrado.co.uk/recycling",
"Culture": "en-GB"
}]
I dont really have a strong grasp of this stuff so all the help is appreciated.

you can try this, it doesn't need to create any classes
var jsonParsed=JArray.Parse(json);
var siteId=10;
var recycleSiteUrl = GetRecycleSiteUrl(jsonParsed,siteId); // contrado.co.uk/recycling
public string GetRecycleSiteUrl(JArray jArray, int siteId)
{
return jArray.Where(x=> (string) x["SiteId"] == siteId.ToString()).First()["RecycleSiteUrl"].ToString();
}
or using json path
string recycleSiteUrl= (string)jsonParsed
.SelectToken("$[?(#.SiteId=="+siteId.ToString()+")].RecycleSiteUrl");

using Newtonsoft.Json;
using System.Linq;
public void Method()
{
var yourSearchParameter = 10;
string jsonStr = readURL("//my URL is here");
var obj = JsonConvert.DeserializeObject<List<RecycleSite>>(jsonStr);
var siteUrl = obj.SingleOrDefault(q => q.SiteId == yourSearchParameter).RecycleSiteUrl;
/* Do something with the siteUrl */
}
public class RecycleSite
{
public int SiteId { get; set; }
public string RecycleLogoUrl { get; set; }
public string RecycleSiteUrl { get; set; }
public string Culture{ get; set; }
}

using Newtonsoft.Json;
using System;
using System.Collections.Generic;
public Class Site
{
public string GetRecycleSiteUrl(int siteId, string jsonArray)
{
var siteInfos = JsonConvert.DeserializeObject<List<SiteInfo>>(jsonArray);
string recycleSiteUrl = siteInfos.FirstOrDefault(info => info.SiteId == siteId).RecycleSiteUrl;
return recycleSiteUrl;
}
}
public class SiteInfo
{
public int SiteId { get; set; }
public string RecycleLogoUrl { get; set; }
public string RecycleSiteUrl { get; set; }
public string Culture { get; set; }
}
You can create Site object and access GetRecycleSiteUrl method by passing respective parameter values.

How to assign value to variable from a google API Json Response c#

I am trying to assign the value of a key from an async JSON response to a variable, the JSON key in question is the "threatType" Key. I am querying google's safebrowsing v4 API and I get a good response, the problem is when I try to assign a key to a variable nothing is assigned. Here's my code:
public static async Task<string> CheckUrl( string Api_Key, string MyUrl)
{
safeBrowsing_panel i = new safeBrowsing_panel();
var service = new SafebrowsingService(new BaseClientService.Initializer
{
ApplicationName = "Link-checker",
ApiKey = Api_Key
});
var request = service.ThreatMatches.Find(new FindThreatMatchesRequest()
{
Client = new ClientInfo
{
ClientId = "Link-checker",
ClientVersion = "1.5.2"
},
ThreatInfo = new ThreatInfo()
{
ThreatTypes = new List<string> { "SOCIAL_ENGINEERING", "MALWARE" },
PlatformTypes = new List<string> { "ANY_PLATFORM" },
ThreatEntryTypes = new List<string> { "URL" },
ThreatEntries = new List<ThreatEntry>
{
new ThreatEntry
{
Url = MyUrl
}
}
}
});
var response = await request.ExecuteAsync();
string json = JsonConvert.SerializeObject(await request.ExecuteAsync());
string jsonFormatted = JToken.Parse(json).ToString(Formatting.Indented);
Console.WriteLine(jsonFormatted);
return jsonFormatted;
}
I created classes to parse the json:
public class ThreatRes
{
public string threatType;
}
public class RootObjSB
{
public List<ThreatRes> matches;
}
And I call it with:
string SB_Result = await CheckUrl("MyAPIKey", "Bad_URL");
RootObjSB obj = JsonConvert.DeserializeObject<RootObjSB>(SB_Result);
The JSON response from google:
{
"matches": [
{
"cacheDuration": "300s",
"platformType": "ANY_PLATFORM",
"threat": {
"digest": null,
"hash": null,
"url": "http://badurl.com/",
"ETag": null
},
"threatEntryMetadata": null,
"threatEntryType": "URL",
"threatType": "SOCIAL_ENGINEERING",
"ETag": null
}
],
"ETag": null
}
I need help please.

So I tried using JavaScriptSerializer and it seemed to work just fine, I also reconstructed my classes to parse all the properties on the JSON response.
Reconstructed Classes:
public class Threat
{
public object digest { get; set; }
public object hash { get; set; }
public string url { get; set; }
public object ETag { get; set; }
}
public class Match
{
public string cacheDuration { get; set; }
public string platformType { get; set; }
public Threat threat { get; set; }
public object threatEntryMetadata { get; set; }
public string threatEntryType { get; set; }
public string threatType { get; set; }
public object ETag { get; set; }
}
public class RootObjSB
{
public List<Match> matches { get; set; }
public object ETag { get; set; }
}
and i deserialize it like this:
string SB_Result = await CheckUrl("MyAPIKey", "Bad_URL");
var obj = new JavaScriptSerializer().Deserialize<RootObjSB>(SB_Result);
string threat = obj.matches[0].threatType;
Console.WriteLine(threat);
I really don't know why the first option I tried didn't parse the data correctly but this was how I overcame that problem. Hope it helps anyone going through the same thing

JSON Deserialize Object HTTPWebResponse

I am trying to take my Web Request JSON output and parse it. Here is the output
{
"kind":"internal",
"name":"SplashPageToggle_dg",
"fullPath":"SplashPageToggle_dg",
"generation":1255326,
"selfLink":"https://link",
"type":"stri ng",
"records":[
{
"name":"enable_app1",
"data":"0"
},
{
"name":"enable_app2",
"da ta":"0"
},
{
"name":"enable_app3",
"data":"0"
},
{
"name":"enable_app4",
"data":"0"
},
{
"name":"enable_app5",
"data":"0"
},
{
"name":"enable_app6",
"data":"1"
},
{
"name":"enable_app7",
"data":"0"
},
{
"name":"enable_app8",
"data":"0"
},
{
"name":"enable_app9",
"data":"0"
},
{
"name":"enable_app10",
"data":"0"
}
]
}
I have created public classes for these results
public class RootObject
{
public string kind { get; set; }
public string name { get; set; }
public string fullPath { get; set; }
public int generation { get; set; }
public string selfLink { get; set; }
public string type { get; set; }
public List<Record> records { get; set; }
}
public class Record
{
public string name { get; set; }
public string data { get; set; }
}
When I try to deserialize the Record class and choose the name, I get the name from the RootObject class. Here is my code
static void Main(string[] args)
{
string url = "URL";
HttpWebRequest getRequest = (HttpWebRequest)WebRequest.Create(url);
getRequest.Method = "GET";
getRequest.Credentials = new NetworkCredential("UN", "PW");
ServicePointManager.ServerCertificateValidationCallback = new
RemoteCertificateValidationCallback
(
delegate { return true; }
);
var getResponse = (HttpWebResponse)getRequest.GetResponse();
Stream newStream = getResponse.GetResponseStream();
StreamReader sr = new StreamReader(newStream);
var result = sr.ReadToEnd();
var splashInfo = JsonConvert.DeserializeObject<Record>(result);
Console.WriteLine(splashInfo.name);
Console.ReadLine();
}

You are trying to deserialize your JSON into the wrong class.
Change this line:
var splashInfo = JsonConvert.DeserializeObject<Record>(result);
to this:
var splashInfo = JsonConvert.DeserializeObject<RootObject>(result);
Fiddle: https://dotnetfiddle.net/2xR7hO

JSON Parser Element not found

This is my JSON
{
"State of Origin 2014":{
"1471137":{
"EventID":1471137,
"ParentEventID":1471074,
"MainEvent":"State Of Origin Series 2014",
"Competitors":{
"ActiveCompetitors":3,
"Competitors":[
{
"Team":"New South Wales (2 - 1)",
"Win":"2.15",
},
{
"Team":"New South Wales (3 - 0)",
"Win":"3.05",
},
{
"Team":"Queensland (2 - 1)",
"Win":"3.30",
}
],
"TotalCompetitors":3,
"HasWinOdds":true
},
"EventStatus":"Open",
"IsSuspended":false,
"AllowBets":true
},
"3269132":{
"EventID":3269132,
"ParentEventID":0,
"MainEvent":"New South Wales v Queensland",
"Competitors":{
"Margin1Low":1,
"Competitors":[
{
"Name":"New South Wales",
"Win":"1.60",
},
{
"Name":"Queensland",
"Win":"2.35",
}
],
"HasWinOdds":true,
"TotalOddsColumns":2,
"MarketCount":1,
"PerformVideo":false
},
"EventStatus":"Open",
"IsSuspended":false,
"AllowBets":true
}
}
}
I am using JSON.Net and everything is working fine but in some of my data some element fields are missing for example i am getting Team element inside Competitors as
Teams = from JObject comps in value["Competitors"]["Competitors"]
select (string)comps["Team"]
But in some data Team element is missing and i want to grap Name Element so i am getting Object reference not set to an instance of an object. Error.
This is my code
var query =
from JProperty ev in obj.AsJEnumerable()
from JProperty evid in ev.Value.AsJEnumerable()
let value = (JObject)evid.Value
select new Person
{
EventID = (string)value["EventID"],
Description = (string)value["MainEvent"],
OutcomeDateTime = (string)value["OutcomeDateTime"],
EventStatus = (string)value["EventStatus"],
Teams = from JObject comps in value["Competitors"]["Competitors"]
select (string)comps["Team"]
};
foreach (var b in query)
{
string description = b.Description;
string OutcomeDateTime = b.OutcomeDateTime;
IEnumerable<string> _team = b.Teams;
foreach (var teams in _team)
{
string team = teams.ToString();
}
Console.WriteLine(description);
Console.WriteLine(OutcomeDateTime);
}
How can i get Name element value if Team element does not exist ?

You can deserialize your json to concrete classes
var obj = JsonConvert.DeserializeObject < Dictionary<string, Dictionary<string,RootObject>>>(json);
public class Competitor
{
public string Team { get; set; }
public string Win { get; set; }
}
public class CompetitorsClass
{
public int ActiveCompetitors { get; set; }
public List<Competitor> Competitors { get; set; }
public int TotalCompetitors { get; set; }
public bool HasWinOdds { get; set; }
}
public class RootObject
{
public int EventID { get; set; }
public int ParentEventID { get; set; }
public string MainEvent { get; set; }
public CompetitorsClass Competitors { get; set; }
public string EventStatus { get; set; }
public bool IsSuspended { get; set; }
public bool AllowBets { get; set; }
}
BTW: What is OutcomeDateTime? there is no such field in your json.

The following will work. Use the null-coalescing operator to grab "Name" if "Team" is null. http://msdn.microsoft.com/en-us/library/ms173224.aspx
Teams = from JObject comps in value["Competitors"]["Competitors"]
select (string)comps["Team"] ?? (string)comps["Name"]