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Editorial Team
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Asked: 2026-06-13T18:50:17+00:00

When I am trying to deserialize my JSON with JSON.Net it gives me invalid

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When I am trying to deserialize my JSON with JSON.Net it gives me invalid values for JSON arrays.

I have simple JSON:

[
{
    "PhaseName": "Start",
    "Advices": ["Lorem ipsum dolor",
    "Lorem ipsum dolor",
    "Lorem ipsum dolor"]
},
{
    "PhaseName": "In Progress",
    "Advices": ["Lorem ipsum dolor",
    "Lorem ipsum dolor",
    "Lorem ipsum dolor"]
},
{
    "PhaseName": "Finish",
    "Advices": ["Lorem ipsum dolor",
    "Lorem ipsum dolor",
    "Lorem ipsum dolor"]
}

]

And a correspondent class in my code:

public class Advices
{
    public string PhaseName { get; set; }
    public List<string> AdvicesList { get; set; }
}

And a veriable that represents an array of Advices objects:

public class MyAdvices
{
    private Advices[] MyAdvicesArrays;
....

So when I am trying to deserialize my JSON like that:

MyAdvicesArrays= JsonConvert.DeserializeObject<Advices[]>(sMyJSON));

JSON.Net populates “Phase Name” property of each object in my MyAdvicesArrays array with correct value but Advices array of each object is invalid: “Could not evaluate expression” if you check them in runtime. I don’t get it. What I’ve done wrong?

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1 Answer

  1. Editorial Team

    No, you’re JSON is incorrect as is you Class.

    First change your JSON to this:

    {
    phases:[
        {
            "PhaseName": "Start",
            "Advices": ["Lorem ipsum dolor",
            "Lorem ipsum dolor",
            "Lorem ipsum dolor"]
        },
        {
            "PhaseName": "In Progress",
            "Advices": ["Lorem ipsum dolor",
            "Lorem ipsum dolor",
            "Lorem ipsum dolor"]
        },
        {
            "PhaseName": "Finish",
            "Advices": ["Lorem ipsum dolor",
            "Lorem ipsum dolor",
            "Lorem ipsum dolor"]
        }
    ]
}

    Notice before you weren’t declaring you JSON object correctly. Also you need a property for the array.

    Now you’ll need two classes:

    public class AnythinYouWant{
    public List<Phase> Phases{get;set;}
}

public class Phase{
    public string PhaseName{get;set;}
    public List<string> Advices{get;set;}
}

    Notice how the first class is for the top level JSON object. The name can be whatever you want. But any property needs to match the name.

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