如何在 c# 中正确反序列化 Json

Question

Good afternoon. I need to deserialize the fields in JSON so that I can work with them as variables. I wrote a getter and setter for fields, loaded json from the url, but at the deserialization stage I get an error

"Newtonsoft.Json.JsonSerializationException: 'Cannot deserialize the current JSON array (eg [1,2,3]) into type 'GetDataFromUrl.JsonData' because the type requires a JSON object (eg {"name":"value"}) to deserialize correctly."

How do I correctly specify data for deserialization?

This type of JSON:

[
    {
        "Date": "2020-01-30",
        "CountProblem": 10,
        "Users": 8,
    }
]

Code:

class JsonData
{
    public DateTime Date { get; set; }
    public int CountProblem { get; set; }
    public int Users { get; set; }
}

    class Report
{
    static void Main(string[] args)
    {
        WebClient client = new WebClient();
        var urlResponse = client.DownloadString("//my url");

        JsonData jsondata = JsonConvert.DeserializeObject<JsonData>(urlResponse);

        DateTime date = jsondata.Date;
        int problemCount = jsondata.CountProblem;
        int Users = jsondata.Users;

        Console.WriteLine(Date + "," + CountProblem + "," + Users);
    }

Answer 1

Your json string represents array not a single object, so try:

List<JsonData> jsondata = JsonConvert.DeserializeObject<List<JsonData>>(urlResponse);