How to read a file in c#

Is this page helpful? Please rate your experience Yes No. Any additional feedback? Note The files that are used in this example are created in the topic How to write to a text file. Submit and view feedback for This product This page. View all page feedback. This is one of the fastest method along with ReadAllBytes which I will discuss next to read a file from the system. ReadAllBytes — This method can be used to read all the bytes of the File from File system as shown below.

This is one of the slowest method to retrieve the text of the file as internally it creates a list of lines of files using StreamReader and returns as array of string. Append s. Append item. Please find below table which shows the approximate time taken in milliseconds by each of the method.

In this article I have discussed about the various ways in which we can read a file from the system and compared their performance. Nice article. We display the contents of the file using the same string array. There is another way to read a file and that is by using a StreamReader object.

The StreamReader also reads one line at a time and returns a string. All of the above-mentioned ways to read a file are illustrated in the example code given below. WriteLine "Reading File using File. ReadAllText file ; Console. WriteLine ; Console. ReadAllLines file ; foreach string ln in lines Console. Close ; Console. Or you can use the Visual Studio. Here, we have a text file named as Textfile. WriteAllText and File. WriteAllText writes the entire file at once.

It takes two arguments, the path of the file and the text that has to be written. WriteAllLines writes a file one line at a time. It takes two arguments, the path of the file and the text that has to be written, which is a string array. There is another way to write to a file and that is by using a StreamWriter object.

The StreamWriter also writes one line at a time. All of the above-mentioned ways to write to a text file are illustrated in the example code given below. WriteLine File. Output: In case you want to add more text to an existing file without overwriting the data already stored in it, you can use the append methods provided by the File class of System. Skip to content. Change Language.