JsonData to Enum

Question

Hi Unity commmunity, I have an issue.

I'm using LitJson to make a database of items: alt text

I have a class to create a new item, which has the following parameters: alt text

My issue is that when I try to choose the rarity of the item, which is an enum that cosists of {common, uncommon, rare, legendary, ...}, I get the following problem: https://gyazo.com/921fc188c1f9c83483617cf160d86e9d

How do I convert JsonData to an enum?

Answer 1

Best Answer

Answer by Bunny83 · Sep 21, 2016 at 05:44 PM

Well, you need to parse the string you get from your Json data into the appropriate enum value by using System.Enum.Parse:

 (Rarity)System.Enum.Parse(typeof(Rarity), itemData[i]["rarity"])

instead of

 itemData[i]["rarity"]

edit
unfortunately you can't add extension methods to "types" only to "instances". You could add this class to your project:

 public static class EnumExtension
 {
     public static T Parse<T>(this System.Enum aEnum, string aText)
     {
         return (T)System.Enum.Parse(typeof(T), aText);
     }
 }

It will add the Parse method to each enum value. So you could simply do:

 Rarity.common.Parse(itemData[i]["rarity"])

It doesn't matter which enum member you use. Of course instead of an extension method you could simply place the method in a helper class:

 public static class Helper
 {
     public static T ParseEnum<T>(string aText)
     {
         return (T)System.Enum.Parse(typeof(T), aText);
     }
 }

This can be used like this:

 Helper.ParseEnum<Rarity>(itemData[i]["rarity"])

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Squishyaura · Sep 21, 2016 at 07:25 PM 1

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Thank you my good sir, have a wonderful day!

Answer 2

Answer by elenzil · Sep 23, 2016 at 12:06 AM

Bunny's answer is very good. here's the variant i use:

   public static bool ParseStringToEnum<T>(string s, out T enumValue) where T: struct, IComparable, IFormattable, IConvertible {
     foreach (T enumCandidate in System.Enum.GetValues(typeof(T))) {
       if (s == enumCandidate.ToString()) {
         enumValue = enumCandidate;
         return true;
       }
     }
     
     enumValue = default(T);
     
     return false;
   }

less performant, but won't throw exception. hm, maybe one could just put a try/catch around System.Enum.Parse().

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JsonData to Enum

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