如何使对象在Unity C中可序列化

Question

起初它是文本，但我希望它是图像/精灵，所以我将其更改为对象。但是现在我得到了这些错误。我的错误在第50行和第51行。

请帮助：（

  

错误：无法将索引应用于类型为object的表达式

     

错误：分配的左侧必须是变量，属性或   索引器

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

public class Kuis : MonoBehaviour {
    [SerializeField] Text teksPertanyaan;
    [SerializeField] Object[] teksPilihan;
    [SerializeField] Soal[] soal;
    [SerializeField] int indeksSoal;

//deklarasi lcm
int a, b, m, x, hasil;

// Use this for initialization
void Start () {
    a = 4;
    b = 5;
    m = 9;
    x = 0;

    for (int i = 0; i < soal.Length; i++) {
        x = (a * x + b) % m;
        hasil = x % 3;
        Debug.Log("" +hasil);
        tampilSoal (hasil);
    }
}

// Update is called once per frame
void Update () {

}

IEnumerator dealay(){
    yield return new WaitForSeconds (1);
    //tampilSoal (Random.Range (1, 5));
    tampilSoal (Random.Range (0, soal.Length));
    //Debug.Log("" +hasil);
    Debug.Log("" +indeksSoal);
}

public void konten(){
    StartCoroutine (dealay ());
}

void tampilSoal(int _indeksSoal){
    indeksSoal = _indeksSoal;
    teksPertanyaan.text = soal [_indeksSoal].pertanyaan;
    for (int i = 0; i < soal [_indeksSoal].pilihan.Length; i++) {
        teksPilihan [i].ToString = soal [_indeksSoal].pilihan [i];
    }
}

public void verifikasiJawaban(int _indeksJawaban){
    if (_indeksJawaban == soal [indeksSoal].indeksJawaban) {
        print ("Jawaban Benar!");
        konten ();
    }
    else {
        //hilangSoal.SetActive (false);
        print ("Jawaban Salah!");
        konten ();
    }
}
}