20200421 - File 읽기 (JSON)

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> File.ReadAllText() -- 모든 문자열 읽기

 public void ReadAllTextTest()
        {
            string path = "./cookie_data.json";

            string json = File.ReadAllText(path);

            Console.WriteLine(json);

            CookieData[] arrCookieDatas = JsonConvert.DeserializeObject<CookieData[]>(json);

            foreach (var item in arrCookieDatas)
            {
                Console.WriteLine($"{item.id} / {item.name} / {item.grade}");
            }
        }

 

> File.ReadAllLines() -- 문자열 한줄씩 읽어오기

 public void ReadAllLinesTest()
        {
            string path = "./cookie_data.json";

            string[] textValue = File.ReadAllLines(path);

            string fullTextValue = "";
            foreach (var item in textValue)
            {
                fullTextValue += item;
            }

            Console.WriteLine(fullTextValue);

            CookieData[] arrCookieDatas = JsonConvert.DeserializeObject<CookieData[]>(fullTextValue);
            foreach (var item in arrCookieDatas)
            {
                Console.WriteLine($"{item.id} / {item.name} / {item.grade}");
            }
        }

 

> File.OpenRead() / new StreamReader() -- 파일 읽어와 textReader 스트림에서 문자열 읽기

public void FileStreamTest()
        {
            string path = "./cookie_data.json";

            FileStream fs = File.OpenRead(path); 
            StreamReader sr = new StreamReader(fs);

            // sr.ReadToEnd() 스트림 끝까지 모든 문자를 읽기
            CookieData[] arrCookieDatas = JsonConvert.DeserializeObject<CookieData[]>(sr.ReadToEnd());

            foreach (var item in arrCookieDatas)
            {
                Console.WriteLine($"{item.id} / {item.name} / {item.grade}");
            }
        }

 

> File.ReadAllLines()

            string[] jsonLines = File.ReadAllLines(fileDir);      

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> CookieData.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace _20200421_json
{
    class CookieData
    {
        public int id;
        public string name;
        public int grade;
    }
}