How to read values from JsonNode in System.Text.Json-CodePudding

I want to serialize a refresh token and send it to the client.

Then on return, I want to deserialize and read it.

Here's my code.

using System.Text.Json;
using System.Dynamic;
using System;
using System.Text.Encodings.Web;
using System.Text.Unicode;
using System.Text.Json.Nodes;


dynamic token = new ExpandoObject();

token.UserName = "John";
token.Expires = DateTime.Now.AddMinutes(5);
token.CreateDate = DateTime.Now;

var options = new JsonSerializerOptions
                {
                    PropertyNameCaseInsensitive = true,
                    PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
                    DictionaryKeyPolicy = JsonNamingPolicy.CamelCase,
                    Encoder = JavaScriptEncoder.Create(UnicodeRanges.All)
                };

var refreshToken = JsonSerializer.Serialize(token,  options);

Console.WriteLine(refreshToken);

var deserializedToken = JsonSerializer.Deserialize<JsonNode>(refreshToken, options);

var userName = "How can I extract username from JsonNode";

I tried to use JsonNode["UserName"].Value, but it does not work.

CodePudding user response：

Since you are using dynamic all subsequent variables are resolved as dynamic too. Just declare one of the types (for example string for serialization result) and use indexer GetValue:

string refreshToken = JsonSerializer.Serialize(token,  options);

JsonNode? deserializedToken = JsonSerializer.Deserialize<JsonNode>(refreshToken, options);
var userName = deserializedToken["userName"].GetValue<string>();

CodePudding user response：

Your type after deserializaton will be a JsonNode, If you try to use a dynamic, your type after deserialization will be a JsonElement, so you can not gain anything with dynamic too. You can just use Parse

JsonNode deserializedToken = JsonNode.Parse(refreshToken);
string userName = (string) deserializedToken["userName"];

and you can create a json string much more simple way and without using options too

    var token = new
    {
        userName = "John",
        expires = DateTime.Now.AddMinutes(5),
        createDate = DateTime.Now
    };

string refreshToken = System.Text.Json.JsonSerializer.Serialize(token);