using?System;
using?System.Collections.Generic;
using?System.ComponentModel;
using?System.Data;
using?System.Drawing;
using?System.IO;
using?System.Linq;
using?System.Text;
using?System.Threading.Tasks;
using?System.Windows.Forms;

namespace?FileReadWrite
{
????public?partial?class?Form1?:?Form
????{
????????public?Form1（）
????????{
????????????InitializeComponent（）;
????????}

????????
????????private?static?Boolean?createutf_8file（string?strText?string?strPath）
????????{
????????????//聲明一個Boolean變量返回文件是否新增成功
????????????Boolean?blstate?=?false;
????????????if?（!File.Exists（strPath））?//根據文件路徑判斷文件是否存在
????????????{
????????????????//使用using語句創建實現了IDisposable接口的類，當using語句塊結束后，
????????????????//程序會自動調用IDisposable接口的Dispose方法來銷毀創建的實例。
????????????????using?（StreamWriter?sw?=?File.CreateText（strPath））??//創建用于寫入?UTF-8?編碼的文本
????????????????{
????????????????????sw.Write（strText）;?//向寫入流中寫入內容
????????????????????blstate?=?true;?//成功即返回true
????????????????}
????????????}
????????????else?//文件存在就刪除文件
????????????{
????????????????File.Delete（“D:\\增刪改\\test1.txt“）;?//使用File?操作文件的靜態類的Delete的方法刪除文件
????????????????using?（StreamWriter?sw?=?File.CreateText（strPath））??//創建用于寫入?UTF-8?編碼的文本
????????????????{
????????????????????sw.Write（strText）;?//向寫入流中寫入內容
????????????????????blstate?=?true;?//成功即返回true
????????????????}
????????????????return?true;
????????????}
????????????return?blstate;
????????}

????????private?void?button1_Click（object?sender?EventArgs?e）
????????{
????????????try
????????????{
????????????????//OpenFileDialog?ofdg?=?new?OpenFileDialog（）;//打開文件對話框
????????????????//if?（ofdg.ShowDialog（this）?==?System.Windows.Forms.DialogResult.OK）
????????????????//{
????????????????//????string?file?=?ofdg.FileName;
????????????????//????textBox2.Text?=?System.IO.File.ReadAllText（file?Encoding.Default）;
????????????????//}


????????????????openFileDialog1.ShowDialog（）;??//打開選擇文件對話框
????????????????TextFileName.Text?=?openFileDialog1.FileName;??//獲取打開的文件名
????????????????FileStream?fs?=?File.OpenRead（openFileDialog1.FileName）;?//打開現有文件以進行讀取
????????????????byte[]?bs?=?new?byte[1024];?//定義緩存
????????????????if?（fs.Read（bs?0?bs.Length）?>?0）???//每次讀取1024個字節?，判斷結果是否大于0
????????????????{
????????????????????textContext.Text?=?Encoding.Default.GetString（bs）;?//把字節數組所有字節轉為一個字符串

????????????????????//textContext.Text?=?Convert（byte）.?System.IO.File.ReadAllText（bs?Encoding.Default）;
????????????????}
????????????????fs.Close（）;?//關閉文件流
????????????}
????????????catch?（Exception）
????????????{
????????????????throw;
????????????}
????????}
????????///?

????????///?寫入按鈕點擊事件（向文件寫入內容）
????????///?

????????///?
????????///?
????????private?void?btnWrite_Click（object?sender?EventArgs?e）
????????{

????????????if?（TextFileName.Text?!=?““）
????????????{
????????????????if?（textContext.Text?!=?““）
?????

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2020-09-27?09:24??FileReadWrite\.vs\
?????目錄???????????0??2020-09-27?09:24??FileReadWrite\.vs\FileReadWrite\
?????目錄???????????0??2020-09-27?09:24??FileReadWrite\.vs\FileReadWrite\v16\
?????文件???????55296??2020-09-28?10:41??FileReadWrite\.vs\FileReadWrite\v16\.suo
?????文件????????1145??2020-09-27?09:24??FileReadWrite\FileReadWrite.sln
?????目錄???????????0??2020-09-28?10:22??FileReadWrite\FileReadWrite\
?????文件?????????187??2020-09-27?09:24??FileReadWrite\FileReadWrite\App.config
?????目錄???????????0??2020-09-27?17:45??FileReadWrite\FileReadWrite\bin\
?????目錄???????????0??2020-09-27?09:51??FileReadWrite\FileReadWrite\bin\Debug\
?????文件???????11264??2020-09-28?10:22??FileReadWrite\FileReadWrite\bin\Debug\FileReadWrite.exe
?????文件?????????187??2020-09-27?09:24??FileReadWrite\FileReadWrite\bin\Debug\FileReadWrite.exe.config
?????文件???????36352??2020-09-28?10:22??FileReadWrite\FileReadWrite\bin\Debug\FileReadWrite.pdb
?????目錄???????????0??2020-09-27?17:45??FileReadWrite\FileReadWrite\bin\Release\
?????文件????????3774??2020-09-27?17:45??FileReadWrite\FileReadWrite\FileReadWrite.csproj
?????文件????????7121??2020-09-28?10:22??FileReadWrite\FileReadWrite\Form1.cs
?????文件????????5721??2020-09-27?20:12??FileReadWrite\FileReadWrite\Form1.Designer.cs
?????文件????????6020??2020-09-27?20:12??FileReadWrite\FileReadWrite\Form1.resx
?????目錄???????????0??2020-09-27?09:24??FileReadWrite\FileReadWrite\obj\
?????目錄???????????0??2020-09-28?10:21??FileReadWrite\FileReadWrite\obj\Debug\
?????文件?????????210??2020-09-27?09:24??FileReadWrite\FileReadWrite\obj\Debug\.NETframeworkVersion=v4.8.AssemblyAttributes.cs
?????文件????????1423??2020-09-28?10:13??FileReadWrite\FileReadWrite\obj\Debug\DesignTimeResolveAssemblyReferences.cache
?????文件????????7345??2020-09-27?17:45??FileReadWrite\FileReadWrite\obj\Debug\DesignTimeResolveAssemblyReferencesInput.cache
?????文件??????????42??2020-09-27?19:35??FileReadWrite\FileReadWrite\obj\Debug\FileReadWrite.csproj.CoreCompileInputs.cache
?????文件?????????825??2020-09-27?16:45??FileReadWrite\FileReadWrite\obj\Debug\FileReadWrite.csproj.FileListAbsolute.txt
?????文件????????1012??2020-09-27?20:12??FileReadWrite\FileReadWrite\obj\Debug\FileReadWrite.csproj.GenerateResource.cache
?????文件?????????424??2020-09-28?10:21??FileReadWrite\FileReadWrite\obj\Debug\FileReadWrite.csprojAssemblyReference.cache
?????文件???????11264??2020-09-28?10:22??FileReadWrite\FileReadWrite\obj\Debug\FileReadWrite.exe
?????文件?????????180??2020-09-27?20:12??FileReadWrite\FileReadWrite\obj\Debug\FileReadWrite.Form1.resources
?????文件???????36352??2020-09-28?10:22??FileReadWrite\FileReadWrite\obj\Debug\FileReadWrite.pdb
?????文件?????????180??2020-09-27?19:35??FileReadWrite\FileReadWrite\obj\Debug\FileReadWrite.Properties.Resources.resources
?????目錄???????????0??2020-09-27?09:24??FileReadWrite\FileReadWrite\obj\Debug\TempPE\
............此處省略7個文件信息