CODEWITHSUNDEEP
c#json
V.Prasad
V.Prasad

Reputation: 151

Convert List double array to List Double

I have some json format using that i created a class with properties.

Below is my json data format:

       [{
            coordinates: [-74, 40.7],
            values: [22.4, 23.2, 21.5, 20.6,12.3],
        },
        {
            coordinates: [-77, 38.90],
            values: [13.4, 18.2, 24.5, 10.6, 16.3],
        },
        {
            coordinates: [-87, 41.88],
            values: [39.3, 28.8, 10.4, 20.0, 0],
        }]

Below is my class created from json data:

public class MapDataList
{
    public List<double> coordinates { get; set; }
    public List<double> values { get; set; }
}

and i have to set value for coordinates and values properties like below:

coordinates: [-74, 40.7], values: [22.4, 23.2, 21.5, 20.6,12.3],

So that this value i can use in my map chart.

I have created one method and tried something in below:

public List<MapDataList> CreateMapData()
{
    List<MapDataList> lstMapData = new List<MapDataList>();
    MapDataList mdl = new MapDataList();
    List<double[]> lb1=new List<double[]>();
    double[] coordinateItem1 = {-74, 40.7};
    lb1.Add(coordinateItem1);
    return lstMapData;
}

But question here is i have to set lb1 object data to lstMapData object.

Upvotes: 0

Views: 783

Answers (2)

Jon Koeter
Jon Koeter

Reputation: 1094

I'm updating this answer, but you should know: it's still NOT clear what you are trying to do.

I made a new fiddle. What this does is:

  1. Create a LIST of MapDataList out of the JSON you provided.
  2. Create an IEnumerable of doubles for coordinates and create an IEnumerable of doubles for values.

I did that last thing because the title of your question seems to indicate you need a list of doubles, while having a list of double-array's.

If this is NOT what you need, please be MORE CLEAR!

Code:

public class Program
{
    public static void Main()
    {
        var json = "[{ coordinates: [-74, 40.7], values: [22.4, 23.2, 21.5, 20.6,12.3], }, { coordinates: [-77, 38.90], values: [13.4, 18.2, 24.5, 10.6, 16.3], }, { coordinates: [-87, 41.88], values: [39.3, 28.8, 10.4, 20.0, 0], }]";

        var mapDataLists = JsonConvert.DeserializeObject<List<MapDataList>>(json);

        var coordinates = mapDataLists.SelectMany(d => d.coordinates);
        var values = mapDataLists.SelectMany(d => d.values);

        Console.WriteLine("Coordinates");
        foreach(var d in coordinates){
            Console.WriteLine(d);
        }

        Console.WriteLine("Values");
        foreach(var d in coordinates){
            Console.WriteLine(d);
        }
    }
}

public class MapDataList
{
    public List<double> coordinates { get; set; }
    public List<double> values { get; set; }
}

Please see this fiddle and TRY it yourself: https://dotnetfiddle.net/C48r6T

Upvotes: 1

aloisdg
aloisdg

Reputation: 23521

Object Initializer is a helpful notion.

Object initializers let you assign values to any accessible fields or properties of an object at creation time without having to invoke a constructor followed by lines of assignment statements.

source

  • Use the MapDataList Object Initializer to create it
  • Use the List Object Initializer to wrap mdl into the new list

Also, the easiest way to convert an array (or any collection) to a list is to use the .ToList() method from System.Linq;

Code:

public static List<MapDataList> CreateMapData(double[] coordinates, double[] values )
{
    MapDataList mdl = new MapDataList
    {
        Coordinates = coordinates.ToList(),
        Values = values.ToList()
    };
    return new List<MapDataList> { mdl };
}

Try it Online!

Note that you could even remove mdl and write

public static List<MapDataList> CreateMapData(double[] coordinates, double[] values )
{
    return new List<MapDataList> { new MapDataList
    {
        Coordinates = coordinates.ToList(),
        Values = values.ToList()
    }};
}

Upvotes: 0

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