We Keep Coding

Cannot deserialize the current JSON object (e.g. {"name":"value"}

This line is giving me the error
Cannot deserialize the current JSON object (e.g. {"name":"value"})
From other posts I gather I should not be putting this into a list. However This worked fine for me until I added the avgPx field.
How can I get this information into my List properly?
Does my list of type <OrderRecord> need to include all the fields returned by the JSON?
List<OrderRecord> orderRecord_Single = new List<OrderRecord>();//define and set to null
OrderRecord_Single = JsonConvert.DeserializeObject<List<OrderRecord>>(orderString);
This is one case of my jsonstring. It has the brackets on it.
"[{\"orderID\":\"5dcc6560-9672-958d-010b-7d18c9d523ab\",\"account\":1024235,\"symbol\":\"ETHUSD\",\"timestamp\":\"2020-04-26T18:21:05.703Z\",\"clOrdID\":\"\",\"side\":\"Buy\",\"price\":194.95,\"orderQty\":1,\"ordStatus\":\"New\",\"text\":\"ZT\",\"transactTime\":\"2020-04-26T18:21:05.703Z\",\"avgPx\":null}]"
public class OrderRecord
{
[JsonProperty("orderID")]
public string orderID { get; set; }
[JsonProperty("symbol")]
public string symbol { get; set; }
[JsonProperty("side")]
public string side { get; set; }
[JsonProperty("price")]
public string price { get; set; }
[JsonProperty("orderQty")]
public string orderQty { get; set; }
[JsonProperty("ordStatus")]
public string ordStatus { get; set; }
[JsonProperty("transactTime")]
public string transactTime { get; set; }
[JsonProperty("timestamp")]
public string timestamp { get; set; }
[JsonProperty("avgPx")]
public string avgPx { get; set; }
}

The error occurs because you are trying deserializing a JSON object to a JSON array. So you should provide a JSON array as in input. For the given JSON, add brackets [ ] to the first and last of the JSON string for creating valid JSON array:
var jsonString = "[{\"orderID\":\"8d853505-248d-e515-ee17-ddcd24b5fecb\",\"account\":1024235,\"symbol\":\"XBTUSD\",\"timestamp\":\"2020-04-20T18:25:07.601Z\",\"clOrdID\":\"\",\"side\":\"Buy\",\"price\":6885.5,\"orderQty\":8700,\"ordStatus\":\"Filled\",\"text\":\"ZT\",\"transactTime\":\"2020-04-20T18:22:11.135Z\",\"avgPx\":6885.5}]"

Convert JSON string to object C#

I have JSON string results as follows.
In this response Sometimes sizeKey and sizeName properties are returned as a string. But sometimes both properties are returns inside an array as follows
I am using following code to convert it to object
var assets = jObject["assets"].Children().ToList();
foreach (var item in assets)
{
decorationAssets.Add(item.ToObject<AEDecorationAssets>());
}
And my AEDecorationAssets class is as follows.
public class AEDecorationAssets
{
public string Id { get; set; }
public string Url { get; set; }
public string[] Colors { get; set; }
public string FontKey { get; set; }
public string SizeKey { get; set; }
public string ViewKey { get; set; }
public string FontName { get; set; }
public int Rotation { get; set; }
public string SizeName { get; set; }
public string TextValue { get; set; }
public string EntityType { get; set; }
public string LocationCode { get; set; }
public string LocationName { get; set; }
public string TextEffectKey { get; set; }
public string TextEffectName { get; set; }
public string DecorationMethod { get; set; }
public string NumDecorationColors { get; set; }
}
At the time when "sizeKey" is an array, the above code gives an error. How can I resolve this issue? Is there any JSON property we can use to resolve it?

One way you can do it is by making your SizeKey type an object (i.e. public object SizeKey { get; set; }), then you can switch/case on item.ToObject<AEDecorationAssets>().SizeKey.GetType() to figure out how to handle it (i.e. if String do this, if JArray do that), etc.

If a JSON type is sometime an array, and sometimes a string, you can't really map it simply to a .NET type, as there is none that supports this behavior.
So first you need a datatype that can store this, like and string[] or List<string>.
It could be that JsonConvert will solve this automatically, but otherwise you'll need to write a custom ContractResolver or JsonConverter. Here you can detect if the source property is a string or array. If it's an array, you can use the default deserialization. If it is a string, you need to convert it to an array with a single value.

Simply get json result for which you want to create c# object and then you can valid json response from https://jsonlint.com/ and then you can create c# object of any type json response which you want through http://json2csharp.com. And after get c# object of your json response you only need to deserialization of your json response to c# object which you have created. which will return you expected result.

Deserialize multiple JSON records in C# [duplicate]

This question already has an answer here:
Deserializing JSON into an object
(1 answer)
Closed 5 years ago.
I have the following string of Json records:
{
"records":[
{
"PK":"1_1_8",
"ID":"8",
"DeviceID":"1",
"RootID":"1",
"CustName":"test1",
"CustSurname":"test2",
"Address":"Nisou 1",
"City":"",
"ZipCode":"",
"PhoneNumber":"45646",
"HomePhoneNumber":"",
"Email":"",
"Notes":"",
"Owner":"1",
"LanguageID":"1",
"LanguagePK":"",
"DeletedFlag":"false",
"created":"2017-10-25 10:15:00",
"modified":"2017-10-25 09:35:43"
},
{
"PK":"1_1_33",
"ID":"33",
"DeviceID":"1",
"RootID":"1",
"CustName":"",
"CustSurname":"",
"Address":"",
"City":"",
"ZipCode":"",
"PhoneNumber":"",
"HomePhoneNumber":"",
"Email":"",
"Notes":"",
"Owner":null,
"LanguageID":"0",
"LanguagePK":"",
"DeletedFlag":"true",
"created":"2017-10-25 10:13:54",
"modified":"2017-10-25 10:13:54"
},
{
"PK":"1_1_16",
"ID":"16",
"DeviceID":"1",
"RootID":"1",
"CustName":"Theodosis",
"CustSurname":"",
"Address":"Dali",
"City":"Nicosia",
"ZipCode":"2540",
"PhoneNumber":"45645",
"HomePhoneNumber":"99123456",
"Email":"theodosis#gmail.com",
"Notes":"",
"Owner":"",
"LanguageID":"1",
"LanguagePK":"",
"DeletedFlag":"false",
"created":"2017-10-25 09:36:22",
"modified":"2017-10-25 09:36:22"
}
]
}
I am using Xamarin PCL in C# trying to parse this string into a list of objects.
I have a Customer class:
public class Customer
{
[PrimaryKey]
public string PK { get; set; }
public int DeviceID { get; set; }
public int ID { get; set; }
public string RootID{ get; set; }
public string CustName { get; set; }
public string CustSurname { get; set; }
public string Address { get; set; }
public string City { get; set; }
public string ZipCode { get; set; }
public string PhoneNumber { get; set; }
public string HomePhoneNumber { get; set; }
public string Email { get; set; }
public string Notes { get; set; }
public bool Owner { get; set; }
public int LanguageID { get; set; }
public string LanguagePK { get; set; }
public bool DeletedFlag { get; set; }
public DateTime created { get; set; }
public DateTime modified { get; set; }
}
I also tried out having a container class with a list of Customer objects.
public class DataContainer
{
public List<Customer> customers { get; set; }
}
I have seen quite a few of examples online on how to parse this into a list or any workable type but nothing seems to be working for me.
I have tried the following (JsonResults holds the string of Json records):
var observation = JsonConvert.DeserializeObject<DataContainer>(JsonResults);
From other posts, I am not able to access JavaScriptSerializer class from my code, perhaps because of the Xamarin PCL Framework I am using.
Any ideas would be very welcome, as I said I do not mind the format I parse the string into, as long as it's workable.
Thank you.

You would have to make the following changes to your code to make this work.
First and most importantly, you don't have a property customers, you have records, so either rename it
public class DataContainer {
public List<Customer> records { get; set; }
}
or add a JsonProperty attribute
[JsonProperty(PropertyName = "records")]
Secondly, your Owner is a bool in C# and a nullable int (int?) in Json. So either change it in your C# class
public int? Owner { get; set; }
or write a converter to do that (e.g. like here)
[JsonConverter(typeof(NullableIntToBooleanConverter))]
public bool Owner { get; set; }
Here is a working .NetFiddle

The JSON string you provided is a JSON object, which contains a single property called records. records property is a List<Customer>. You can not deserialize the given string directly into DataContainer class that you provided because the property names do not match.
In the Class that your provided it is called customers
public class DataContainer {
public List<Customer> customers { get; set; } //records
}
Or please have a look at the attribute for a bit of advanced mapping
[JsonProperty]
JSON you provided is of the form:
{"records":[{Customer},{Customer},{Customer}]}
But Owner property is "1", null or "". Therefore I would suggest redefining Owner as int? (nullable)

Your string shows one object with a property named records that contains a list of other objects. Your code is trying to deserialize this into an object that doesn't have such a property.
Furthermore, the string contains objects with a property Owner that may be missing or have a numeric value. It's definitely not a bool.
You'll have to change Owner to :
public int? Owner { get; set; }
To deserialize the string, you need an object with a records property:
public class DataContainer
{
public Customer[] records { get; set; }
}
var data=JsonConvert.DeserializeObject<DataContainer>(json);
Debug.Assert(data.records.Length == 3);

JSON Deserializer "loses" last property of JSON value

passing a Json value like this one(this will be the var jsonValue in code):
"{\"Something\":0,\"Something2\":10,\"Something3\":{\"Something4\":17,\"Something5\":38042,\"Something6\":38043,\"Id\":215},\"Something7\":215,\"SomethingId\":42,\"Something8\":\"AString, Gläser\",\"Something8\":\"44-55-18\",\"Status\":{\"Caption\":\"Fixed\",\"Value\":7},\"Type\":\"Article\",\"Id\":97,\"#Delete\":true,\"Something9\":\"8\"}"
to the following code:
var deserializer = new JsonSerializer();
const string regex = #"/Date\((.*?)\+(.*?)\)/";
var reader = new JsonTextReader(new StringReader(jsonValue));
returnValue = deserializer.Deserialize(reader, type);
type is the typeof https://dotnetfiddle.net/LMPEl0 (thank you Craig) (sorry for the weird names, can't disclose the actual ones...)
The jsonvalue is generated by input in an editable cell of a DataTable and apparently places previously null values in the end of the json string.
I get a null value in the "Something9" property in the returnValue, instead of 8(Something9 was null before and set to 8 through an editable Cell of a DataTable)
Is there some problem with the Json value that I can't see?
Or do I need some setting in the Deserializer?
Thanks

You don't show what your type is so I generated one using http://json2csharp.com.
public class Something3
{
public int Something4 { get; set; }
public int Something5 { get; set; }
public int Something6 { get; set; }
public int Id { get; set; }
}
public class Status
{
public string Caption { get; set; }
public int Value { get; set; }
}
public class RootObject
{
public int Something { get; set; }
public int Something2 { get; set; }
public Something3 Something3 { get; set; }
public int Something7 { get; set; }
public int SomethingId { get; set; }
public string Something8 { get; set; }
public Status Status { get; set; }
public string Type { get; set; }
public int Id { get; set; }
[JsonProperty("#Delete")]
public bool Delete { get; set; }
public string Something9 { get; set; }
}
Because one of your properties has a name that is not valid as a .NET property I added the [JsonProperty] attribute to that one. After that it worked perfectly. Perhaps the problem is with how you declared the #Delete JSON property in your .NET type. Given that Something9 comes after that property it would be my guess that that's part of the problem.
Here's the fiddle.
https://dotnetfiddle.net/McZF9Q

While Craig's answer helped a lot and finally led to a solution the exact answer to the problem was the following:
The Status object is an Enum and was not Deserialized correctly.
Due to that, anything that followed in the Json string was also not deserialized.
Implementing a custom Enum Deserializer was the solution. There are other Questions in stackoverflow that helped with this, particularly this one here:
How can I ignore unknown enum values during json deserialization?
Thank you everyone :)

How to filter null or empty value from Json string

I have a one Model it's look like
public class DataClass
{
public string Name { get; set; }
public string Address { get; set; }
public string ContactNo { get; set; }
}
and I tried to convert in Json request using below mentioned code.
var l=new List<Data>();
l.Add(new Data(){Name="foo",Address ="bar",ContactNo =123});
l.Add(new Data(){Name="biz",Address ="baz"});
string json=JsonConvert.SerializeObject(l);
it will give me string like
[{"Name":"foo","Address":"bar","ContactNo":"123"},{"Name":"biz","Address":"baz","ContactNo":""}]
in output second ContactNo has a empty string but I don't need the field which has a no value or NULL .
can anyone please tell me what is the best way to avoid NULL or Empty field from Json request?
Thanks in Advance.

Change your model as below
public class Data
{
public string Name { get; set; }
public string Address { get; set; }
public int? ContactNo { get; set; }
}
and then serialize your object as below
var result = JsonConvert.SerializeObject(
l,
new JsonSerializerSettings()
{
NullValueHandling = NullValueHandling.Ignore
});

I assume you are using Json.Net.
You can use the System.ComponentModel.DefaultValueAttribute. This allows you to mark a property to use a different default value than null.
So, if you want empty strings to be ignored in your JSON output you can update the model class to look like this:
public class DataClass
{
[DefaultValue("")]
public string Name { get; set; }
[DefaultValue("")]
public string Address { get; set; }
[DefaultValue("")]
public string ContactNo { get; set; }
}
Note that the SerializerSettings.DefaultValueHandling must be set to Ignore or IgnoreAndPopulate for this to be picked up.
A more thorough example of various approaches for reducing serialized json size is here:
http://james.newtonking.com/archive/2009/10/23/efficient-json-with-json-net-reducing-serialized-json-size

1.You may add a flag in the model class.
public class DataClass{
public bool isIllegal{get;set;}
public string Name { get; set; }
public string Address { get; set; }
public string ContactNo { get; set{isIllegal=!string.isNullOrEmpty(value);)}
}
2.You can filter data whose isIllegal is false after JsonConvert.SerializeObject(l).