TextWriter

The TextWriter class in .NET is a fundamental class for writing character data to a stream. It is used to write text to a variety of output destinations, including files, network connections, and in-memory buffers. The TextWriter class is part of the System.IO namespace in .NET, and it provides a number of methods for writing text to a stream.

The TextWriter class is an abstract class, which means that it cannot be instantiated directly. Instead, it provides a number of concrete subclasses that can be used for specific purposes. These subclasses include:

1. StreamWriter: This class is used for writing text to a file. It provides methods for writing text to a file, as well as for flushing the output buffer and closing the file.

2. StringWriter: This class is used for writing text to an in-memory buffer. It provides methods for writing text to the buffer, as well as for getting the contents of the buffer as a string.

3. NetworkWriter: This class is used for writing text to a network connection. It provides methods for writing text to a network socket, as well as for flushing the output buffer and closing the socket.

The TextWriter class provides a number of methods for writing text to a stream. These methods include:

1. Write: This method is used to write a single character to the stream.

2. WriteAsync: This method is used to write a single character to the stream asynchronously.

3. Write(string): This method is used to write a string of characters to the stream.

4. WriteAsync(string): This method is used to write a string of characters to the stream asynchronously.

5. WriteLine: This method is used to write a string of characters to the stream, followed by a newline character.

6. WriteLineAsync: This method is used to write a string of characters to the stream, followed by a newline character, asynchronously.

7. Flush: This method is used to flush any buffered data to the underlying stream.

8. Close: This method is used to close the stream and release any resources that it may be holding.

Here is an example of using the TextWriter class to write text to a file using the StreamWriter class:

using System; using System.IO; class Program { static void Main(string[] args) { // Create a new StreamWriter object to write to a file using (StreamWriter writer = new StreamWriter("output.txt")) { // Write a string to the file writer.WriteLine("Hello, world!"); } } }

In this example, the StreamWriter class is used to create a new file called "output.txt" and write the string "Hello, world!" to it. The using statement is used to ensure that the StreamWriter object is properly disposed of when it is no longer needed.

Here is another example of using the TextWriter class to write text to an in-memory buffer using the StringWriter class:

using System; using System.IO; class Program { static void Main(string[] args) { // Create a new StringWriter object to write to an in-memory buffer using (StringWriter writer = new StringWriter()) { // Write a string to the buffer writer.WriteLine("Hello, world!"); // Get the contents of the buffer as a string string output = writer.ToString(); } } }

In this example, the StringWriter class is used to create an in-memory buffer and write the string "Hello, world!" to it. The using statement is used to ensure that the StringWriter object is properly disposed of when it is no longer needed. The ToString method is then used to get the contents of the buffer as a string.