C# TextWriter

In C#, a TextWriter is an abstract base class that defines methods to output streams of characters, such as to a file, memory or network. TextWriter is designed to allow for writing of text in a sequential manner.

A TextWriter is typically created using a StreamWriter class instance. To write to a file, the class constructor can point to the file, such as:

TextWriter tw = new StreamWriter("myfile.txt");

Once created, we can write to the TextWriter using various methods:

• Write(): Writes a single character.
• WriteLine(): Writes a string followed by a new line character.
• WriteAsync(): Writes a single character asynchronously.
• WriteLineAsync(): Writes a string followed by a new line character asynchronously.

Here is an example of writing to a file:

using System;
using System.IO;

class Program {
    static void Main(string[] args) {
        using (TextWriter tw = new StreamWriter("myfile.txt")) {
            tw.WriteLine("Hello World!");
        }
    }
}

This program creates a StreamWriter instance which points to a file named "myfile.txt". The WriteLine() method is then used to write a string to the file, followed by a new line character. The using statement ensures that the TextWriter is properly disposed of once the program is complete.

TextWriters should always be used with a try-catch block to handle any errors that may occur during writing. Additionally, proper disposing of the TextWriter resources is necessary to avoid resource leaks.

Overall, TextWriter is a useful tool for outputting streams of characters to various destinations. It provides a simple, sequential way to write text and can be used for a wide range of applications.