Readline file c#

Article Contributed By :. Easy Normal Medium Hard Expert. Writing code in comment? Please use ide. Load Comments. What's New. Most popular in C. NET Core and. NET Framework Introduction to. NET Framework. More related articles in C. We can also use the ReadAllLines method to read a file line by line. Unlike ReadLines , which returns an Enumerable , ReadAllLines returns a string array containing all lines of the file, and we must wait for the whole array of strings to be returned before accessing the array.

Therefore, we should not use it with large files. ReadAllLines fileName ; Console. The File class also offers the ReadAllText method, which reads all the text in the file in one go. The following code example uses the ReadAllText method to read all the text in the file in one operation and returns a string. To read the file line by line, split the string using String. Split method with the newline as a delimiter. Split Environment. Another solution is to use the StreamReader.

ReadLine method. We can use it to read lines from a file until the end of the file is reached. We can also use the StreamReader. ReadToEnd method, but it reads the whole file in a single operation. However, when used as the console's standard input stream, the TextReader.

If this method throws an OutOfMemoryException exception, the reader's position in the underlying Stream object is advanced by the number of characters the method was able to read, but the characters already read into the internal ReadLine buffer are discarded. Since the position of the reader in the stream cannot be changed, the characters already read are unrecoverable, and can be accessed only by reinitializing the TextReader.

If the initial position within the stream is unknown or the stream does not support seeking, the underlying Stream also needs to be reinitialized. To avoid such a situation and to produce robust code, you should use the KeyAvailable property and ReadKey method and store the read characters in a pre-allocated buffer.

This enables the user to prevent further keyboard input when the ReadLine method is called in a loop. The following example illustrates this scenario. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info.

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