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Below JSON data i'm trying to deserialize using JavaScriptSerializer.Deserialize but, am getting below exception.
Code:
var jsonSerialiser = new JavaScriptSerializer();
FCMCasepackVM casepack = jsonSerialiser.Deserialize<FCMCasepackVM>(selectedCasePack);
JSON Data:
{ P_ID:"1478952", P_NM:"BAHLSEN COOKIES WAFER ROLL MILK CHOCOLATE 3.5
OZ", BYR_ID:191, BYR_NM:"BYR_NM", VDR_ID:48532, VDR_NM:"KEHE FOOD DIST
INC", CPK_ID:"1478952-12", CPK_DSC:"BAHLSEN COOKIES WAFER ROLL MILK
CHOCOLAT", VDR_IT_CD_ID:"6398", UPC_ID:7056921950.0,
CPK_PRI_FLG:"True", CPK_SRC:"PEF", **FCM_RGLT_TYP_CT:"FSV"P"**,
CPK_P_ORIG_DSC:"", RGLN_EXCL_FLG:"False", BRND_TYP:"" }
Exception
Additional information: Cannot convert object of type 'System.String'
to type 'Meijer.MerchProduct.FCM.Models.ViewModels.FCMCasepackVM'
Even I tried serializing the data before deserialize however getting a different exception
Code:
var jsonSerialiser = new JavaScriptSerializer();
selectedCasePack = jsonSerialiser.Serialize(selectedCasePack);
FCMCasepackVM casepack = jsonSerialiser.Deserialize<FCMCasepackVM>(selectedCasePack);
JSON Data after serialize
"{ P_ID:\"1478952\", P_NM:\"BAHLSEN COOKIES WAFER ROLL MILK CHOCOLATE
3.5 OZ\", BYR_ID:191, BYR_NM:\"BYR_NM\", VDR_ID:48532, VDR_NM:\"KEHE FOOD DIST INC\", CPK_ID:\"1478952-12\", CPK_DSC:\"BAHLSEN COOKIES
WAFER ROLL MILK CHOCOLAT\", VDR_IT_CD_ID:\"6398\",
UPC_ID:7056921950.0, CPK_PRI_FLG:\"True\", CPK_SRC:\"PEF\",
FCM_RGLT_TYP_CT:\"FSV\"P\", CPK_P_ORIG_DSC:\"\", RGLN_EXCL_FLG:\"False\", BRND_TYP:\"\" }"
Exception
Additional information: Invalid object passed in, ':' or '}' expected.
(319): { P_ID:"1478952", P_NM:"BAHLSEN COOKIES WAFER ROLL MILK
CHOCOLATE 3.5 OZ", BYR_ID:191, BYR_NM:"BYR_NM", VDR_ID:48532,
VDR_NM:"KEHE FOOD DIST INC", CPK_ID:"1478952-12", CPK_DSC:"BAHLSEN
COOKIES WAFER ROLL MILK CHOCOLAT", VDR_IT_CD_ID:"6398",
UPC_ID:7056921950.0, CPK_PRI_FLG:"True", CPK_SRC:"PEF",
FCM_RGLT_TYP_CT:"FSV"P", CPK_P_ORIG_DSC:"", RGLN_EXCL_FLG:"False",
BRND_TYP:"" }
can anyone please help me?
Thanks in advance,
Karthik
The JSON you are using is invalid and without knowing your container object of FCMCasepackVM and how you got the JSON it is hard to tell what went wrong where. Here is a simple example using the built in System.Web.Script.Serialization technique with the JavaScriptSerializer.
public class POC
{
public int Id { get; set; }
public string Desc { get; set; }
}
static List<POC> GetPOCOs()
{
return new List<POC>
{
new POC { Id = 1, Desc = "John"},
new POC { Id = 2, Desc = "Jane" },
new POC { Id = 3, Desc = "Joey" }
};
}
static void Main(string[] args)
{
var pocos = GetPOCOs();
var serializer = new JavaScriptSerializer();
var sjson = serializer.Serialize(pocos);
var djson = serializer.Deserialize<List<POC>>(sjson);
Console.ReadLine();
}
When I serialize to JSON in text it should look like this:
[{"Id":1,"Desc":"John"},{"Id":2,"Desc":"Jane"},{"Id":3,"Desc":"Joey"}]
Or a single item may be:
{"Id":1,"Desc":"John"}
NOT:
{Id:1,Desc:"John"}
Generally a key pair system is all JSON is but it needs the key surrounded with quotes to be able to know what it is. If you are ever in doubt, use an online JSON validator like http://jsonlint.com/
Where this json data is serialised? quotes should have escaped during serialisation.
This JSON data is invalid, if you have access to app serialising this json data you should change that to escape quotes in the string. (usually all library does that automatically during serialisation)
Update
Hi Karthik, see following code to serialise the objects in JSON format using newtonsoft's library.
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
var d = new DoTheWork();
d.SerializeSample();
}
}
public class Sample
{
public string Id { get; set; }
public string Description { get; set; }
}
public class DoTheWork
{
public string SerializeSample()
{
List<Sample> sampleList = new List<Sample>();
sampleList.Add(new Sample { Id = "1", Description = "Karthik" });
sampleList.Add(new Sample { Id = "1", Description = "Sujit" });
sampleList.Add(new Sample { Id = "1", Description = "John\"s" });
StringBuilder sb = new StringBuilder();
using (StringWriter sw = new StringWriter(sb))
{
JsonSerializer serializer = new JsonSerializer();
serializer.Serialize(sw, sampleList);
}
System.Diagnostics.Debug.Write(sb.ToString());
return sb.ToString();
}
}
I have this JSON string:
[{"fkp_keyword":"CLI_RID"},
{"fkp_keyword":"DOC_NAME"},
{"fkp_keyword":"FILENAME"},
{"fkp_keyword":"PRINT_DATE"},
{"fkp_keyword":"EVENT_CODE"},
{"fkp_keyword":"CONFL_RID"},
{"fkp_keyword":"PROGRAM_CODE"},
{"fkp_keyword":"CES"},
{"fkp_keyword":"DISTR"},
{"fkp_keyword":"REC_DATE"},
{"fkp_keyword":"REC_RID"},
{"fkp_keyword":"PFL_RID"},
{"fkp_keyword":"DES"},
{"fkp_keyword":"CER_RID"}
]
I need to convert it into a List of the class kw below.
Definitions:
public class kw
{
public string fkp_keyword { get; set; }
}
But this code:
List<kw> header = new List<kw>();
using (WebClient client = new WebClient())
{
client.Headers[HttpRequestHeader.ContentType] = "application/x-www-form-urlencoded";
string result = client.DownloadString(parms);
header = JsonConvert.DeserializeObject<List<kw>>(result);
}
The call returns the JSON string above but when trying to convert it, the code above returns this exception:
Error converting value to type 'System.Collections.Generic.List[LA.Models.kw]
Update
I changed the definitions to this:
public class kwList
{
public kw[] Property1 { get; set; }
}
public class kw
{
public string fkp_keyword { get; set; }
}
and the code to this:
kwList header = new kwList();
using (WebClient client = new WebClient())
{
client.Headers[HttpRequestHeader.ContentType] = "application/x-www-form-urlencoded";
string result = client.DownloadString(parms);
header = JsonConvert.DeserializeObject<kwList>(result);
}
But now I'm getting this Exception:
Could not cast or convert from System.String to LicenseeArchive.Models.kwList.
What am I doing wrong?
For whatever reason, it appears that the JSON string returned by that URL is double-serialized. That is, it contains extra backslashes to escape all the quotes, which then prevents it from being deserialized properly to an array of objects. That is why you are getting an error.
To work around the problem, you can deserialize it twice: first to unescape the JSON, the second to do the "real" deserialization to your classes. Longer term, you may also wish to contact the provider of the API to see if they will fix their JSON.
List<kw> header = new List<kw>();
using (WebClient client = new WebClient())
{
client.Headers[HttpRequestHeader.ContentType] = "application/x-www-form-urlencoded";
string result = client.DownloadString(parms);
string unescapedJson = JsonConvert.DeserializeObject<string>(result);
header = JsonConvert.DeserializeObject<List<kw>>(unescapedJson);
}
Fiddle: https://dotnetfiddle.net/XEULdy
JSON string you provided can be loaded with your first class definition:
public class kw
{
public string fkp_keyword { get; set; }
}
Example:
string example = "[{\"fkp_keyword\":\"CLI_RID\"}, {\"fkp_keyword\":\"DOC_NAME\"}, {\"fkp_keyword\":\"FILENAME\"}]";
List<kw> kws = JsonConvert.DeserializeObject<List<kw>>(example);
Maybe you are not providing all details. Or your json string looks different.
My code is below. When I post a JSON body that has \v in it, the server receives JSON that it cannot parse. Any help on how to make it work?
EDIT: well, the argument about my server not being able to parse it is weak, but http://jsonlint.com/ complains about it too. : )
in my emacs it looks like this:
{"key":"a^Kb"}
where ^K I think is a single character.
code:
using RestSharp;
using System;
using System.Collections.Generic;
namespace testapp
{
class Program
{
static void Main(string[] args)
{
var client = new RestClient();
var request = new RestRequest();
request.Method = Method.POST;
request.RequestFormat = DataFormat.Json;
request.Resource = "http://example.com/";
var data = new Dictionary<string, string>();
data.Add("key", "a\vb");
request.AddBody(data);
var response = client.Execute<Dictionary<string, string>>(request);
}
}
}
The default RestSharp JSON serializer serializes this as equivalent to the C# string "{\"key\":\"a\vb\"}"; that is, it sends the \v as a raw byte (0b) over the wire. This is why your server has trouble reading it. I'm unsure if this is legal JSON, but in any case there are ways to escape such a character to avoid issues.
I'd recommend using Json.NET to de/serialize your JSON. If you use the the following class (originally part of RestSharp) as your serializer, it will use Json.NET and should work correctly, since it will encode the \v as \u000b over the wire. The code (sans comments, and renamed for clarity) is copied here for reference:
public class JsonNetSerializer : ISerializer
{
private readonly Newtonsoft.Json.JsonSerializer _serializer;
public JsonNetSerializer()
{
ContentType = "application/json";
_serializer = new Newtonsoft.Json.JsonSerializer
{
MissingMemberHandling = MissingMemberHandling.Ignore,
NullValueHandling = NullValueHandling.Include,
DefaultValueHandling = DefaultValueHandling.Include
};
}
public JsonNetSerializer(Newtonsoft.Json.JsonSerializer serializer)
{
ContentType = "application/json";
_serializer = serializer;
}
public string Serialize(object obj)
{
using (var stringWriter = new StringWriter())
{
using (var jsonTextWriter = new JsonTextWriter(stringWriter))
{
jsonTextWriter.Formatting = Formatting.Indented;
jsonTextWriter.QuoteChar = '"';
_serializer.Serialize(jsonTextWriter, obj);
var result = stringWriter.ToString();
return result;
}
}
}
public string DateFormat { get; set; }
public string RootElement { get; set; }
public string Namespace { get; set; }
public string ContentType { get; set; }
}
To use it, add this line:
request.JsonSerializer = new JsonNetSerializer();
And it will serialize like:
{
"key": "a\u000bb"
}
Which is perfectly valid according to JSONLint.
I'm trying to deserialize a Facebook friend's Graph API call into a list of objects. The JSON object looks like:
{"data":[{"id":"518523721","name":"ftyft"},
{"id":"527032438","name":"ftyftyf"},
{"id":"527572047","name":"ftgft"},
{"id":"531141884","name":"ftftft"},
{"id":"532652067","name"...
List<EFacebook> facebooks = new JavaScriptSerializer().Deserialize<List<EFacebook>>(result);
It's not working, because the primitive object is invalid. How can I deserialize this?
You need to create a structure like this:
public class Friends
{
public List<FacebookFriend> data {get; set;}
}
public class FacebookFriend
{
public string id {get; set;}
public string name {get; set;}
}
Then you should be able to do:
Friends facebookFriends = new JavaScriptSerializer().Deserialize<Friends>(result);
The names of my classes are just an example. You should use proper names.
Adding a sample test:
string json =
#"{""data"":[{""id"":""518523721"",""name"":""ftyft""}, {""id"":""527032438"",""name"":""ftyftyf""}, {""id"":""527572047"",""name"":""ftgft""}, {""id"":""531141884"",""name"":""ftftft""}]}";
Friends facebookFriends = new System.Web.Script.Serialization.JavaScriptSerializer().Deserialize<Friends>(json);
foreach(var item in facebookFriends.data)
{
Console.WriteLine("id: {0}, name: {1}", item.id, item.name);
}
Produces:
id: 518523721, name: ftyft
id: 527032438, name: ftyftyf
id: 527572047, name: ftgft
id: 531141884, name: ftftft
Sometimes I prefer dynamic objects:
public JsonResult GetJson()
{
string res;
WebClient client = new WebClient();
// Download string
string value = client.DownloadString("https://api.instagram.com/v1/users/000000000/media/recent/?client_id=clientId");
// Write values
res = value;
dynamic dyn = JsonConvert.DeserializeObject(res);
var lstInstagramObjects = new List<InstagramModel>();
foreach(var obj in dyn.data)
{
lstInstagramObjects.Add(new InstagramModel()
{
Link = (obj.link != null) ? obj.link.ToString() : "",
VideoUrl = (obj.videos != null) ? obj.videos.standard_resolution.url.ToString() : "",
CommentsCount = int.Parse(obj.comments.count.ToString()),
LikesCount = int.Parse(obj.likes.count.ToString()),
CreatedTime = new System.DateTime(1970, 1, 1, 0, 0, 0, 0).AddSeconds((double.Parse(obj.created_time.ToString()))),
ImageUrl = (obj.images != null) ? obj.images.standard_resolution.url.ToString() : "",
User = new InstagramModel.UserAccount()
{
username = obj.user.username,
website = obj.user.website,
profile_picture = obj.user.profile_picture,
full_name = obj.user.full_name,
bio = obj.user.bio,
id = obj.user.id
}
});
}
return Json(lstInstagramObjects, JsonRequestBehavior.AllowGet);
}
A great way to automatically generate these classes for you is to copy your JSON output and throw it in here:
http://json2csharp.com/
It will provide you with a starting point to touch up your classes for deserialization.
Very easily we can parse JSON content with the help of dictionary and JavaScriptSerializer. Here is the sample code by which I parse JSON content from an ashx file.
var jss = new JavaScriptSerializer();
string json = new StreamReader(context.Request.InputStream).ReadToEnd();
Dictionary<string, string> sData = jss.Deserialize<Dictionary<string, string>>(json);
string _Name = sData["Name"].ToString();
string _Subject = sData["Subject"].ToString();
string _Email = sData["Email"].ToString();
string _Details = sData["Details"].ToString();
Newtonsoft.JSON is a good solution for these kind of situations. Also Newtonsof.JSON is faster than others, such as JavaScriptSerializer, DataContractJsonSerializer.
In this sample, you can the following:
var jsonData = JObject.Parse("your JSON data here");
Then you can cast jsonData to JArray, and you can use a for loop to get data at each iteration.
Also, I want to add something:
for (int i = 0; (JArray)jsonData["data"].Count; i++)
{
var data = jsonData[i - 1];
}
Working with dynamic object and using Newtonsoft serialize is a good choice.
I agree with Icarus (would have commented if I could),
but instead of using a CustomObject class,
I would use a Dictionary (in case Facebook adds something).
private class MyFacebookClass
{
public IList<IDictionary<string, string>> data { get; set; }
}
or
private class MyFacebookClass
{
public IList<IDictionary<string, object>> data { get; set; }
}
Serialization:
// Convert an object to JSON string format
string jsonData = JsonConvert.SerializeObject(obj);
Response.Write(jsonData);
Deserialization::
To deserialize a dynamic object
string json = #"{
'Name': 'name',
'Description': 'des'
}";
var res = JsonConvert.DeserializeObject< dynamic>(json);
Response.Write(res.Name);
If you're using .NET Core 3.0, you can use System.Text.Json (which is now built-in) to deserialize JSON.
The first step is to create classes to model the JSON. There are many tools which can help with this, and some of the answers here list them.
Some options are http://json2csharp.com, http://app.quicktype.io, or use Visual Studio (menu Edit → Paste Special → Paste JSON as classes).
public class Person
{
public string Id { get; set; }
public string Name { get; set; }
}
public class Response
{
public List<Person> Data { get; set; }
}
Then you can deserialize using:
var people = JsonSerializer.Deserialize<Response>(json);
If you need to add settings, such as camelCase handling, then pass serializer settings into the deserializer like this:
var options = new JsonSerializerOptions() { PropertyNamingPolicy = JsonNamingPolicy.CamelCase };
var person = JsonSerializer.Deserialize<Response>(json, options);
You can use this extensions
public static class JsonExtensions
{
public static T ToObject<T>(this string jsonText)
{
return JsonConvert.DeserializeObject<T>(jsonText);
}
public static string ToJson<T>(this T obj)
{
return JsonConvert.SerializeObject(obj);
}
}
Here is another site that will help you with all the code you need as long as you have a correctly formated JSON string available:
https://app.quicktype.io/
I want to be able to convert a List<T> into a specific JSON table-like format. In my case, the T will always be a simple object (no nested properties). Here are two examples to illustrate what I want.
Example #1: List<Person> to JSON
// C# list of Persons
var list = new List<Person>() {
new Person() { First = "Jesse", Last = "Gavin", Twitter = "jessegavin" },
new Person() { First = "John", Last = "Sheehan", Twitter = "johnsheehan" }
};
// I want to transform the list above into a JSON object like so
{
columns : ["First", "Last", "Twitter"],
rows: [
["Jesse", "Gavin", "jessegavin"],
["John", "Sheehan", "johnsheehan"]
]
}
Example #2: List<Address> to JSON
// C# list of Locations
var list = new List<Location>() {
new Location() { City = "Los Angeles", State = "CA", Zip = "90210" },
new Location() { City = "Saint Paul", State = "MN", Zip = "55101" },
};
// I want to transform the list above into a JSON object like so
{
columns : ["City", "State", "Zip"],
rows: [
["Los Angeles", "CA", "90210"],
["Saint Paul", "MN", "55101"]
]
}
Is there a way to tell JSON.net to serialize an object in this manner? If not, how could I accomplish this? Thanks.
UPDATE:
Thanks to #Hightechrider's answer, I was able to write some code that solves the problem.
You can view a working example here https://gist.github.com/1153155
Using reflection you can get a list of properties for the type:
var props = typeof(Person).GetProperties();
Given an instance of a Person p you can get an enumeration of the property values thus:
props.Select(prop => prop.GetValue(p, null))
Wrap those up in a generic method, add your favorite Json serialization and you have the format you want.
Assuming your using .Net 4 this should do everything you want. The class actually lets you convert to either XML or JSON. The Enum for CommunicationType is at the bottom. The serializer works best if the class your passing it has been decorated with DataContract & DataMember attributes. I've included a sample at the bottom. It will also take an anonymous type so long as it's all simple types.
Reflection would work as well but then you have to understand all the JSON nuances to output complex data types, etc. This used the built-in JSON serializer in .Net 4. One more note, because JSON does not define a date type .Net puts dates in a funky ASP.Net custom format. So long as your deserializing using the built-in deserializer it works just fine. I can dig up the documentation on that if you need.
using System;
using System.Xml.Serialization;
using System.Text;
using System.Runtime.Serialization.Json;
using System.IO;
using System.Xml.Linq;
internal class Converter
{
public static string Convert<T>(T obj, CommunicationType format, bool indent = false, bool includetype = false)
{
if (format == CommunicationType.XML)
{
return ToXML<T>(obj, includetype, indent);
}
else if (format == CommunicationType.JSON)
{
return ToJSON<T>(obj);
}
else
{
return string.Empty;
}
}
private static string ToXML<T>(T obj, bool includetype, bool indent = false)
{
if (includetype)
{
XElement xml = XMLConverter.ToXml(obj, null, includetype);
if(indent) {
return xml.ToString();
}
else
{
return xml.ToString(SaveOptions.DisableFormatting);
}
}
else
{
System.Xml.Serialization.XmlSerializerNamespaces ns = new System.Xml.Serialization.XmlSerializerNamespaces();
XmlSerializer xs = new XmlSerializer(typeof(T));
StringBuilder sbuilder = new StringBuilder();
var xmlws = new System.Xml.XmlWriterSettings() { OmitXmlDeclaration = true, Indent = indent };
ns.Add(string.Empty, string.Empty);
using (var writer = System.Xml.XmlWriter.Create(sbuilder, xmlws))
{
xs.Serialize(writer, obj, ns);
}
string result = sbuilder.ToString();
ns = null;
xs = null;
sbuilder = null;
xmlws = null;
return result;
}
}
private static string ToJSON<T>(T obj)
{
DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(T));
using (MemoryStream ms = new MemoryStream())
{
string result = string.Empty;
System.Text.UTF8Encoding encoding = new System.Text.UTF8Encoding();
ser.WriteObject(ms, obj);
result = encoding.GetString(ms.ToArray());
ms.Close();
encoding = null;
ser = null;
return result;
}
}
}
[DataContract()]
public enum CommunicationType : int
{
[XmlEnum("0"), EnumMember(Value = "0")]
XML = 0,
[XmlEnum("1"), EnumMember(Value = "1")]
JSON = 1
}
[DataContract(Namespace = "")]
public partial class AppData
{
[DataMember(Name = "ID")]
public string ID { get; set; }
[DataMember(Name = "Key")]
public string Key { get; set; }
[DataMember(Name = "Value")]
public string Value { get; set; }
[DataMember(Name = "ObjectType")]
public string ObjectType { get; set; }
}
Any specific reason why you don't need the standard format?
To actually answer the question:
Since this is something that is outside of JSON syntax I can't think of a way to implement this within the default framework.
One solution would be to leverage attributes decorate the properties you want transported over the wired with a custom attribute and using Reflection cycle through the properties and output their property names as the column headers and then cycle throw the objects and write the values. Generic enough so it could be applied across other objects as well.
public class Location
{
[JsonFooAttribute("City")]
public string city {get;set;}
[JsonFooAttribute("State")]
public string state {get;set;}
}