How to: Write Text to a File
.NET Framework 4.5
The following examples show how to write text to a text file.
The first example reads all the text files from the user's My Documents folder by searching for "*.txt", and synchronously writes them into a large text file.
using System; using System.IO; using System.Text; using System.Collections.Generic; class Program { static void Main(string[] args) { string mydocpath = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments); StringBuilder sb = new StringBuilder(); foreach (string txtName in Directory.EnumerateFiles(mydocpath,"*.txt")) { using (StreamReader sr = new StreamReader(txtName)) { sb.AppendLine(txtName.ToString()); sb.AppendLine("= = = = = ="); sb.Append(sr.ReadToEnd()); sb.AppendLine(); sb.AppendLine(); } } using (StreamWriter outfile = new StreamWriter(mydocpath + @"\AllTxtFiles.txt")) { outfile.Write(sb.ToString()); } } }
The next example shows how to asynchronously write user input from a text box to a file.
using System; using System.Text; using System.Windows; using System.IO; namespace WpfApplication { public partial class MainWindow : Window { public MainWindow() { InitializeComponent(); } private async void AppendButton_Click(object sender, RoutedEventArgs e) { string mydocpath = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments); StringBuilder sb = new StringBuilder(); sb.AppendLine("New User Input"); sb.AppendLine("= = = = = ="); sb.Append(UserInputTextBox.Text); sb.AppendLine(); sb.AppendLine(); using (StreamWriter outfile = new StreamWriter(mydocpath + @"\UserInputFile.txt", true)) { await outfile.WriteAsync(sb.ToString()); } } } }
