how to access to a class list deserialized from a json file-CodePudding

I've been trying to get data from a JSON file with VScode. I made some classes and can use some of the values saved in the different classes. My problem right now is, that I got a Class which contains a List within a List... How can I get this value? Got some Code-example. Thank you in advance for your help:

namespace TestDeserialize
{
    public class DataInfo
    {
        [JsonProperty("Sample rate")]
        public int SampleRate { get; set; }
    }

    public class Datum
    {
        public string Trigger { get; set; }

        [JsonProperty("Channel :AS_V[mm]")]
        public List<List<double>> ChannelASVMm { get; set; } //Want to get those values
    }

    public class Root
    {
        public DataInfo Data_info { get; set; }
        public List<Datum> Data { get; set; }
    }



    public class Program
    {
        public static void Main()
        {
            string filename2 = @"C:\Users\10606167\TestDatenAbstand.json";
            Root datum = JsonConvert.DeserializeObject<Root>(File.ReadAllText(filename2));
            Console.WriteLine($"Samplerate: {datum.Data_info.SampleRate}");    
        }
    }
}

This is my JSON-File:

{"Data_info":{"File name":"C:\\Dewesoft\\Data\\Test(2).dxd","Start time":"22.08.2022","Number of channels":1,"Sample rate":100,"Reduced rate":10},
"Events":[{"Event Type:":1,"Event :":"Speicherung gestartet um","Time:":0,"Comment:":""},{"Event Type:":2,"Event :":"Speicherung gestoppt um","Time:":1.72,"Comment:":""}]
, "Data":[
{
"Trigger" : "Data1",
"Channel :AS_V[mm]":[
[0, 1.57027852535248]
]
}]}

I can get the value of my samplerate but I dont know how to get the value of ChannelASVm...

CodePudding user response：

If you simply want the first value of the first List of the first Datum in your Root class, you just have to do something like this :

public class Program
{
    public static void Main()
    {
        string filename2 = @"C:\Users\10606167\TestDatenAbstand.json";
        Root datum = JsonConvert.DeserializeObject<Root>(File.ReadAllText(filename2));
        
        double valueInListOfList = datum.Data[0].ChannelASVMm[0][0];
    }
}

To target an element in a List inside another List by using indexes, you just have to chain [] like this : [<indexOfFirstList>][<indexOfSecondList>]

If you want to target specific Datum instances and specific double values in ChannelASVm, you will have to add some conditions to be able to target exactly what instances/values you want.

For that you can take a look at some Linq functions :

Or simply do a foreach and extract the data you need, but I recommend to use Linq instead

CodePudding user response：

if you need just Channel :AS_V[mm], you don't need any classes

List<double> channel = JObject.Parse(json)["Data"]
          .SelectMany(x => x["Channel :AS_V[mm]"]).First().ToObject<List<Double>>();

or you can use classes

List<List<double>> channelASVMm = datum.Data.SelectMany(x=> x.ChannelASVMm).ToList();
List<double> channelASVMmFirst = channelASVMm.FirstOrDefault();