using System;

using System.Collections;

using System.Text;

using System.Xml.Serialization;

using System.IO;

​

public class StreamingAssetBehaviour : MonoBehaviour

{

    void Start()

    {

        StartCoroutine(StreamingAssetRequest.RequestCoroutine(path: "example.json",

            success: a =>

            {

                print(StreamingAssetConvert.ToString(a)); // {"Count":123,"Name":"TVOHM"}

                print(StreamingAssetConvert.DeserializeJson<MySerializable>(a).Name); // TVOHM

            },

            error: e => print(e)));

    }

}

​

public static class StreamingAssetRequest

{

    public static IEnumerator RequestCoroutine(string path, Action<byte[]> success, Action<string> error)

    {

        using UnityWebRequest request = UnityWebRequest.Get(Path.Combine(Application.streamingAssetsPath, path));

        yield return request.SendWebRequest();

        if (request.result == UnityWebRequest.Result.Success)

        {

            success?.Invoke(request.downloadHandler.data);

        }

        else

        {

            error?.Invoke(request.error);

        }

    }

}

​

public static class StreamingAssetConvert

{

    public static string ToString(byte[] data, Encoding encoding) => encoding.GetString(data);

    public static string ToString(byte[] data) => ToString(data, Encoding.UTF8);

    public static T DeserializeJson<T>(byte[] data, Encoding encoding) => JsonUtility.FromJson<T>(encoding.GetString(data));

    public static T DeserializeJson<T>(byte[] data) => DeserializeJson<T>(data, Encoding.UTF8);

    public static T DeserializeXml<T>(byte[] data, Encoding encoding) => (T)new XmlSerializer(typeof(T)).Deserialize(new StringReader(encoding.GetString(data)));

    public static T DeserializeXml<T>(byte[] data) => DeserializeXml<T>(data, Encoding.UTF8);

}

​

[Serializable]

public class MySerializable

{

    public int Count;

    public string Name;

}