FileInfo - WriteAllText
reates a new file, writes the specified string 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() { var text = @"<!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> "; // C# Extension Method: FileInfo - WriteAllText FileName.ToFileInfo().WriteAllText(text); // C# Extension Method: FileInfo - ReadAllText var allText = FileName.ToFileInfo().ReadAllText(); Console.WriteLine(allText); }
View Source
using System; using System.IO; using System.Text; public static partial class Extensions { /// <summary> /// Creates a new file, writes the specified string 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="contents">The string 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 /// <paramref name="contents" /> 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 WriteAllText(this FileInfo @this, String contents) { File.WriteAllText(@this.FullName, contents); } /// <summary> /// Creates a new file, writes the specified string to the file using the specified encoding, 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="contents">The string to write to the file.</param> /// <param name="encoding">The encoding to apply to the string.</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 /// <paramref name="contents" /> 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 WriteAllText(this FileInfo @this, String contents, Encoding encoding) { File.WriteAllText(@this.FullName, contents, encoding); } }