Assigning data from a class list to another class list

Question

I have the following class which is populated after de-serializing a JSON string:

public class Doors
{
    public List<Door> doors { get; set; }
}

public class Door
{
    public int id { get; set; }
    public string name { get; set; }
    public bool elevator { get; set; }
}

JSON string:

var result = JsonConvert.DeserializeObject<Doors>(response.Content);
// "{\"doors\":[{\"id\":1,\"name\":\"Main Door\",\"elevator\":false},{\"id\":2,\"name\":\"Back Door\",\"elevator\":false}]}"

The data maps to my class fine, I'm then trying to pass the class data to another class:

public class WS4APIResult
{   
    public List<Door> doors { get; set; } = new List<Door>();      
}

public class Door
{
    public int id { get; set; }
    public string name { get; set; }
    public bool elevator { get; set; }
}

return new WS4APIResult() {         
    doors = result.doors
}

With the following error: any ideas please?

Cannot implicitly convert type 'System.Collections.Generic.List<WS4PortalApi.Models.Door>' to 'System.Collections.Generic.List<WS4PortalApi.Domain.Door>'

You can't cast an object to another type just because they have the same property names. Write a "copy" method than copies ease property or use a 3rd party library like Automapper. — D Stanley
– D Stanley, Commented Apr 20, 2020 at 12:57

Ackdari · Accepted Answer · 2020-04-20 13:00:32Z

2

The two c#-Files refer to different classes if you type Door. You need to implement a conversion between WS4PortalApi.Models.Door and WS4PortalApi.Domain.Door.

Like:

public static WS4PortalApi.Domain.Door DoorConvert(WS4PortalApi.Models.Door door)

then you can use linq to generate a new List

doors = result.doors
    .Select(d => DoorConvert(d))
    .ToList();

answered Apr 20, 2020 at 13:00

Ackdari

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Comments

ReSchaber · Accepted Answer · 2020-04-20 13:44:23Z

1

You have to map the properties of your domain object to those of the model. I normally create a method for this like:

var doors = new List<Model.Door>();
foreach(door in result.doors)
{
     var doorModel = new Model.Door
     {
         id = door.id,
         name = door.name,
         elevator = door.elevator
     };
     doors.Add(doorModel);
}
return doors;

Or you can use a library like automapper.

answered Apr 20, 2020 at 13:44

ReSchaber

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