HAARFTE/Assets/DemoGame/GameRes/ExcelTemplate.txt

using System;
using UnityEngine;
using System.Collections.Generic;
using System.IO;
using Newtonsoft.Json;

[System.Serializable]
public class #CLASSNAME#
{
	#CONSTCONTENT#
}

[System.Serializable]
public class #CLASSNAME#s
{
	public List<#CLASSNAME#> #LISTNAME# = new List<#CLASSNAME#>();
}

public class #CLASSNAME#Excel
{
    private const string _fileName = "#FILENAME#";
    private string _filePath;
    private #CLASSNAME#s _datas;
    public #CLASSNAME#s Datas => _datas;

    public TestDataExcel()
    {
        _filePath = $"{Application.streamingAssetsPath}/ExcelData/{_fileName}.json";
        var text = File.ReadAllText(_filePath);
        _datas = JsonConvert.DeserializeObject<#CLASSNAME#s>(text);
    }

    public #CLASSNAME# GetData(int id)
    {
        foreach (var testData in _datas.#LISTNAME#)
        {
            if (id == testData.Id)
            {
                return testData;
            }
        }

        throw new NullReferenceException();
    }
}