What is the difference between a StreamReader and file ReadAllLines?

What is the difference between a StreamReader and file ReadAllLines?

The StreamReader read the file line by line, it will consume less memory. Whereas, File. ReadAllLines read all lines at once and store it into string[] , it will consume more memory.

Why we use StreamReader in c#?

C# StreamReader is used to read characters to a stream in a specified encoding. StreamReader. Read method reads the next character or next set of characters from the input stream. StreamReader is inherited from TextReader that provides methods to read a character, block, line, or all content.

How to read text file using StreamReader in c#?

The ReadLine method of StreamReader reads one line at a time.

  1. // Read file using StreamReader. Reads file line by line.
  2. using(StreamReader file = new StreamReader(textFile)) {
  3. int counter = 0;
  4. string ln;
  5. while ((ln = file.ReadLine()) != null) {
  6. Console.WriteLine(ln);
  7. counter++;
  8. }

Is StreamReader disposable?

It is all handled as part of the i disposable interface that the stream reader implements.

Do you have to close Streamreader C#?

You’re better off using the using keyword; then you don’t need to explicitly close anything.

When should you use IDisposable?

in a class, you should implement IDisposable and overwrite the Dispose method to allow you to control when the memory is freed. If not, this responsibility is left to the garbage collector to free the memory when the object containing the unmanaged resources is finalised.

What is StreamReader in VB net?

StreamReader class is used to read data from a file. In this Blog we read some data from a text file in the web page. we create a object of StreamReader class. Read method is used to read character from input stream.

What is StreamReader in Python?

StreamReader. Represents a reader object that provides APIs to read data from the IO stream. It is not recommended to instantiate StreamReader objects directly; use open_connection() and start_server() instead. coroutine read (n=- 1) Read up to n bytes.

What is StreamReader in Visual Basic?

StreamReader handles text files. We read a text file in VB.NET by Using StreamReader. This will correctly dispose of system resources and make code simpler. The best way to use StreamReader requires some special syntax.

Should I dispose Memorystream?

Dispose should be sufficient, but you can call Close and then Dispose if you wish.

Why IDisposable interface is used?

IDisposable is defined in the System namespace. It provides a mechanism for releasing unmanaged resources. When your application or class library encapsulates unmanaged resources such as files, fonts, streams, database connections, etc, they should implement the IDisposable interface or the IAsyncDisposable interface.

Why do we need IDisposable?

The use of IDisposable is a pattern. It’s so important that it gets its own language construct (the using block), but it’s just a pattern. The difference with a destructor, is that in . NET, the destructor is non-deterministic.

What is StreamReader and StreamWriter in VB net?

The StreamReader and StreamWriter classes are used for reading from and writing data to text files. These classes inherit from the abstract base class Stream, which supports reading and writing bytes into a file stream.

What is Asyncio event loop?

The event loop is the core of every asyncio application. Event loops run asynchronous tasks and callbacks, perform network IO operations, and run subprocesses. Application developers should typically use the high-level asyncio functions, such as asyncio.

What is the difference between readalltext and streamreader?

In the File.ReadAllText approach, at some point you had the entire file contents in memory, while with the StreamReader approach, you only had a few bytes worth of file contents in memory at any one time. This can be an issue depending on the size of your files and the kind of computation you’re doing.

How to read an entire file from a streamreader in Java?

using(StreamReader sr=File. OpenText(fileName)) strings=sr. ReadToEnd(); //you then have to process the string T2 Reading the entire file into a single StringBuilderobject using a StreamReader ReadToEnd()method

What kind of file should I read?

The file that is read must be a text file. Do not make decisions about the contents of the file based on the name of the file. For example, the file Form1.vb may not be a Visual Basic source file. Verify all inputs before using the data in your application.

How do streamreader and streamwriter work together?

StreamReader and StreamWriter are built around reading text, so they handle the encoding for us. One is for reading, and the other is for writing. If you instantiate StreamReader or StreamWriter using the constructor that accepts a filename, it will actually use FileStream internally. StreamReader gives us methods such as: