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C# Beyond Basics
C# Beyond Basics
Writing Files
For writing text in a file we create a StreamWriter
object with the path of the file, similar to how we create a StreamReader
object.
Note
The platform currently doesn't support file writing so this can be practiced on a compiler on your PC.
The StreamWriter
object offers a WriteLine
method which can write text into a file. We will now try to write something to the text.txt
file.
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var textFile = new StreamWriter("C:/Users/Admin/Desktop/text.txt"); textFile.WriteLine("This is some new text."); textFile.WriteLine("This is the next line."); textFile.WriteLine("Another line."); textFile.Close();
The above code will overwrite the previous content of the text.txt
file and replace it with:
StreamWriter
has a second parameter called "append" which takes in a boolean value and is set to false
by default. If we set the append parameter to true
then the code will not overwrite the older text rather it would append the new text to the end of the file.
For-example, consider the file text.txt
has the following text in it:
text
First line Second line Third line
We will use the following code to add a new line to it:
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using System; using System.IO; public class HelloWorld { public static void Main(string[] args) { var textFile = new StreamWriter("C:/Users/Admin/Desktop/text.txt", true); textFile.WriteLine("This is a new line."); textFile.Close(); } }
The file will look like this after running the code:
text
First line Second line Third line This is a new line.
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