How to: Write Text to a File
.NET Framework 3.0
The following code examples show how to write text to a text file.
The first example shows how to add text to an existing file. The second example shows how to create a new text file and write a string to it. Similar functionality can be provided by the WriteAllText methods.
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| Visual Basic users may choose to use the methods and properties provided by the My.Computer.FileSystem object for file I/O. For more information, see My.Computer.FileSystem Object. |
Example
using System; using System.IO; class Test { public static void Main() { // Create an instance of StreamWriter to write text to a file. // The using statement also closes the StreamWriter. using (StreamWriter sw = new StreamWriter("TestFile.txt")) { // Add some text to the file. sw.Write("This is the "); sw.WriteLine("header for the file."); sw.WriteLine("-------------------"); // Arbitrary objects can also be written to the file. sw.Write("The date is: "); sw.WriteLine(DateTime.Now); } } }
using System; using System.IO; public class TextToFile { private const string FILE_NAME = "MyFile.txt"; public static void Main(String[] args) { if (File.Exists(FILE_NAME)) { Console.WriteLine("{0} already exists.", FILE_NAME); return; } using (StreamWriter sw = File.CreateText(FILE_NAME)) { sw.WriteLine ("This is my file."); sw.WriteLine ("I can write ints {0} or floats {1}, and so on.", 1, 4.2); sw.Close(); } } }
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