1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 | using System;using System.IO;class WriteTextFile{ static void Main() { // These examples assume a "C:\Users\Public\TestFolder" folder on your machine. // You can modify the path if necessary. // Example #1: Write an array of strings to a file. // Create a string array that consists of three lines. string[] lines = { "First line", "Second line", "Third line" }; System.IO.File.WriteAllLines(@"C:\price\WriteLines.txt", lines); // Example #2: Write one string to a text file. string text = "A class is the most powerful data type in C#. Like structures, " + "a class defines the data and behavior of the data type. "; System.IO.File.WriteAllText(@"C:\price\WriteText.txt", text); // Example #3: Write only some strings in an array to a file. using (System.IO.StreamWriter file = new System.IO.StreamWriter(@"C:\price\WriteLines2.txt")) { foreach (string line in lines) { if (line.Contains("Second") == false) { file.WriteLine(line); } } } // Example #4: Append new text to an existing file using (System.IO.StreamWriter file = new System.IO.StreamWriter(@"C:\price\WriteLines2.txt", true)) { file.WriteLine("Fourth line"); } }}/* Output (to WriteLines.txt): First line Second line Third line Output (to WriteText.txt): A class is the most powerful data type in C#. Like structures, a class defines the data and behavior of the data type. Output to WriteLines2.txt after Example #3: First line Third line Output to WriteLines2.txt after Example #4: First line Third line Fourth line */ |
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