FileInfo - WriteAllBytes
Creates a new file, writes the specified byte array to the file, and then closes the file. If the target file already exists, it is overwritten.
public static string FileName = "test.txt"; public static void Main() { SaveFile(); // C# Extension Method: FileInfo - ReadAllBytes var bytes = FileName.ToFileInfo().ReadAllBytes(); string newFileName = "newTest.txt"; var file = newFileName.ToFileInfo(); // C# Extension Method: FileInfo - WriteAllBytes file.WriteAllBytes(bytes); Console.WriteLine(file.ReadAllText()); } private static void SaveFile() { var html = @"<!DOCTYPE html> <html> <body> <h1>This is <b>bold</b> heading</h1> <p>This is <u>underlined</u> paragraph</p> <h2>This is <i>italic</i> heading</h2> </body> </html> "; html.SaveAs(FileName); }
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using System; using System.IO; public static partial class Extensions { /// <summary> /// Creates a new file, writes the specified byte array to the file, and then closes the file. If the target file /// already exists, it is overwritten. /// </summary> /// <param name="this">The file to write to.</param> /// <param name="bytes">The bytes to write to the file.</param> /// ### /// <exception cref="T:System.ArgumentException"> /// <paramref name="this" /> is a zero-length string, contains only /// white space, or contains one or more invalid characters as defined by /// <see /// cref="F:System.IO.Path.InvalidPathChars" /> /// . /// </exception> /// ### /// <exception cref="T:System.ArgumentNullException"> /// <paramref name="this" /> is null or the byte array is empty. /// </exception> /// ### /// <exception cref="T:System.IO.PathTooLongException"> /// The specified @this, file name, or both exceed the system- /// defined maximum length. For example, on Windows-based platforms, paths must be less than 248 characters, and file /// names must be less than 260 characters. /// </exception> /// ### /// <exception cref="T:System.IO.DirectoryNotFoundException"> /// The specified @this is invalid (for example, it is on /// an unmapped drive). /// </exception> /// ### /// <exception cref="T:System.IO.IOException">An I/O error occurred while opening the file.</exception> /// ### /// <exception cref="T:System.UnauthorizedAccessException"> /// <paramref name="this" /> specified a file that is /// read-only.-or- This operation is not supported on the current platform.-or- /// <paramref /// name="this" /> /// specified a directory.-or- The caller does not have the required permission. /// </exception> /// ### /// <exception cref="T:System.NotSupportedException"> /// <paramref name="this" /> is in an invalid format. /// </exception> /// ### /// <exception cref="T:System.Security.SecurityException">The caller does not have the required permission.</exception> public static void WriteAllBytes(this FileInfo @this, Byte[] bytes) { File.WriteAllBytes(@this.FullName, bytes); } }