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c#jsonserializationjson.net
Dharmesh Chauhan
Dharmesh Chauhan

Reputation: 37

.Net C# Newtonsoft issue with default attribute while DeserializeObject

I am using Newtonsoft for JSON string to deserialize object but I could not get value for default attribute/properties

{
   "displayName": "Token",
   "name": "token",
   "type": "string",
   "default": ""
}

C# code

public class ItemProperties
{
   public string displayName { get; set; }
   public string name { get; set; }
   public string type { get; set; }

   [JsonPropertyName("default")]
   public dynamic defaultValue{ get; set; }
}

Upvotes: 1

Views: 177

Answers (2)

Jon Skeet
Jon Skeet

Reputation: 1502036

You're using JsonPropertyNameAttribute which is part of System.Text.Json. As you're using Json.NET (Newtonsoft.Json) you need JsonPropertyAttribute instead. I would actually apply it to all the properties, and then rename them to be have idiomatic C# names. Here's a complete example:

using Newtonsoft.Json;
using System;
using System.IO;

public class ItemProperties
{
    [JsonProperty("displayName")]
    public string DisplayName { get; set; }

    [JsonProperty("name")]
    public string Name { get; set; }

    [JsonProperty("type")]
    public string Type { get; set; }

    [JsonProperty("default")]
    public dynamic DefaultValue { get; set; }
}

class Program
{
    static void Main()
    {
        string json = File.ReadAllText("test.json");
        var properties = JsonConvert.DeserializeObject<ItemProperties>(json);
        Console.WriteLine($"DisplayName: {properties.DisplayName}");
        Console.WriteLine($"Name: {properties.Name}");
        Console.WriteLine($"Type: {properties.Type}");
        Console.WriteLine($"DefaultValue: {properties.DefaultValue}");
    }
}

Sample JSON:

{
  "displayName": "x",
  "name": "y",
  "type": "z",
  "default": 10
}

Output:

DisplayName: x
Name: y
Type: z
DefaultValue: 10

Upvotes: 3

Dharmesh Chauhan
Dharmesh Chauhan

Reputation: 37

I found my answer it should be accessible using You can use keywords in C# as identifiers by prepending @ in front of them

C# code

public class ItemProperties
{
   public string displayName { get; set; }
   public string name { get; set; }
   public string type { get; set; }

   public dynamic @default { get; set; }
}

then you can access like objItem.@default.

Upvotes: 0

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