How to convert Enum to Json object with Header in C#

Question

Here's what I've done so far

public enum TCountryNames
{
  [Display(Name="America")]
  cnUSA = 1,
  [Display(Name="England")]
  cnUK,
  [Display(Name="CHINA")]
  cnCHN
}

public class MyClass
{
  public static List<KeyValuePair<string, int>> GetEnumList()
    {
        var list = new List<KeyValuePair<string, int>>();
        foreach (var e in Enum.GetValues(typeof(TCountryNames)))
        {
            list.Add(new KeyValuePair<string, int>(e.ToString(), (int)e));
        }
        return list;
    }
}

Result: [cnUSA,1] with total count 3 and without header

The result i want is [{"Id":1,"Name":"America"},{"Id":2,"Name":"England"}]

I've tried [JsonConverter(typeof(StringEnumConverter))] public TCountryNames Names{ get; set; }

I've also tried converting enum to array list var names = Enum.GetValues(typeof(TCountryNames)); ArrayList arrLst = new ArrayList() { names }; but both of them doesn't seems to be working.

*Any help will be appreciated. Thank You in Advance. *

Accessing enum attributes; stackoverflow.com/a/71247074/4139809 — Jeremy Lakeman
– Jeremy Lakeman, Commented Mar 4, 2022 at 5:05
@jeremyLakeman, it will give me a display name but how do I compose the header as well? — CoderGuy
– CoderGuy, Commented Mar 4, 2022 at 5:35

ByungYong Kang · Accepted Answer · 2022-03-04 05:51:38Z

If you don't want to add new class

 public static List<Dictionary<string, object>> GetEnumList()
 {
     var list = new List<Dictionary<string, object>>();
     foreach (var e in Enum.GetValues(typeof(TCountryNames)))
     {
         list.Add(new Dictionary<string, object> { { "Id", (int)e }, { "Name", e.ToString() } });
     }
     return list;
 }

Define a model for serialization

 public class EnumData
 {
     public int Id { get; set; }
     public string Name { get; set; }
 }

 public static List<EnumData> GetEnumList()
 {
     var list = new List<EnumData>();
     foreach (var e in Enum.GetValues(typeof(TCountryNames)))
     {
         list.Add(new EnumData { Id = (int)e, Name = e.ToString() });
     }
     return list;
 }

LukasCwaj · Accepted Answer · 2022-03-04 13:53:47Z

For get display name value you should use System.Reflection. And then you could do this in simple way:

   public enum TCountryNames
    {
        [Display(Name = "America")]
        cnUSA = 1,
        [Display(Name = "England")]
        cnUK,
        [Display(Name = "CHINA")]
        cnCHN
    }

public class EnumData
{
    public int Id { get; set; }
    public string? Name { get; set; }
}

public class MyClass
{
    public static List<EnumData> GetEnumList()
    {
        var list = new List<EnumData>();
        foreach (var e in Enum.GetValues(typeof(TCountryNames)))
        {
            list.Add(new EnumData
            { 
                Id = (int)e, 
                Name = e.GetType()
                    .GetMember(e.ToString())
                    .First()?
                    .GetCustomAttribute<DisplayAttribute>()?
                    .GetName()
            });
        }
        return list;
    }
}

So to clarify:

you create loop foreach enum
take id by casting
take name using reflaction - I added all needed protection against null exception

Output: [ { "Id": 1, "Name": "America" }, { "Id": 2, "Name": "England" }, { "Id": 3, "Name": "CHINA" } ]

Example: https://dotnetfiddle.net/XVL2LI

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