File and Directory in .NET | Notes

byte[] byteArr = File.ReadAllBytes("file path");
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string[] stringArr = File.ReadAllLines("file path");
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 string textInFile =  File.ReadAllText("file path");
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IEnumerable<string> listLines = File.ReadLines("file path");
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 File.WriteAllText("file path", "content");
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// coppy override
File.Copy("source", "des", true);

// coppy không override
File.Copy("source", "des", false);
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File.Move("source", "des");
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File.Delete("file path");
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 File.Exists("file path");
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  void CoppyDirectory(string STABLE_FOLDER, string UPDATE_FOLDER)
        {
            // Get our files (recursive and any of them, based on the 2nd param of the Directory.GetFiles() method
            string[] originalFiles = Directory.GetFiles(STABLE_FOLDER, "*", SearchOption.AllDirectories);

            // Dealing with a string array, so let's use the actionable Array.ForEach() with a anonymous method
            Array.ForEach(originalFiles, (originalFileLocation) =>
            {
                // Get the FileInfo for both of our files
                FileInfo originalFile = new FileInfo(originalFileLocation);
                FileInfo destFile = new FileInfo(originalFileLocation.Replace(STABLE_FOLDER, UPDATE_FOLDER));
                // ^^ We can fill the FileInfo() constructor with files that don't exist...

                // ... because we check it here
                if (destFile.Exists)
                {
                    // Logic for files that exist applied here; if the original is larger, replace the updated files...
                    if (originalFile.Length > destFile.Length)
                    {
                        originalFile.CopyTo(destFile.FullName, true);
                    }
                }
                else // ... otherwise create any missing directories and copy the folder over
                {
                    Directory.CreateDirectory(destFile.DirectoryName); // Does nothing on directories that already exist
                    originalFile.CopyTo(destFile.FullName, false); // Copy but don't over-write  
                }

            });
        }
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DirectoryInfo dir = new DirectoryInfo("directory path");
       
// Lấy ra danh sách file     
FileInfo[] listFile = dir.GetFiles();

// Lấy ra danh sách folder
DirectoryInfo[] listDir = dir.GetDirectories();

// Lấy ra danh sách file với đuôi
FileInfo[] listFile = dir.GetFiles(".jpg");
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