简体   繁体   中英

LitJSON: Unable to use foreach in Unity

I'm using LitJSON to load .json data, and I'm running some test code with a foreach loop, but it's not working.

InvalidOperationException: Instance of JsonData is not a dictionary
LitJson.JsonData.EnsureDictionary()

(this error is thrown when the foreach line is run)

    using UnityEngine;
    using LitJson;
    using System.Collections;
    using System.Collections.Generic;
    using System.IO;

    public void LoadData() {
        JsonReader reader = new JsonReader("[1, 2, 3, 4, 5]");
        JsonData data = JsonMapper.ToObject(reader);

        foreach (JsonData i in data) {
          Debug.Log("foreach: test");
        }
    }

According to the example in the documentation (Ctrl+F "foreach"; it's near the bottom of the page), I'm pretty sure this code should work (?).

Anyone have any ideas as to why this wouldn't work? Advice would be greatly appreciated!

Edit: The solution is to cast data to an IList object as follows:

foreach (JsonData i in data as IList) {
    Debug.Log("foreach: " + i)
}

1 .Don't use foreach on anything that is not array in Unity. It allocates memory mercilessly.

2 .Unity has a Built in Json serialize called JsonUtility . I suggest you use that. It currently does not support array and your question suggests you are using Json array. There is a solution to get it work with array. Look here . Read from where it says 2. MULTIPLE DATA(ARRAY JSON) . Once you get it working, it will be easy to do next time and no external library required. I also recommend it because it faster than most other Json libraries.

Note : You need Unity 5.3 and above to get this to work.

EDIT:

From my comment, this worked

foreach (var i in data as IList){

}

The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.

 
粤ICP备18138465号  © 2020-2024 STACKOOM.COM