Question

I have an application that dumps text to a text file. I think there might be an issue with the text not containing the proper carriage returns, so I’m in the process of writing a test that will compare the contents of of this file to a string variable that I declare in the code.

Ex:

1) Code creates a text file that contains the text:

This is line 1
This is line 2
This is line 3

2) I have the following string that I want to compare it to:

string testString = "This is line 1\nThis is line 2\nThis is line3"

I understand that I could open a file stream reader and read the text file line by line and store that in a mutable string variable while appending “\n” after each line, but wondering if this is re-inventing the wheel (other words, .NET has a built in class for something like this). Thanks in advance.

Answer 1

you can either use StreamReader’s ReadToEnd() method to read contents in a single string like

    using System.IO;

    using(StreamReader streamReader = new StreamReader(filePath))
    {
       string text = streamReader.ReadToEnd();
    }

Note: you have to make sure that you release the resources (above code uses “using” to do that) and ReadToEnd() method assumes that stream knows when it has reached an end. For interactive protocols in which the server sends data only when you ask for it and does not close the connection, ReadToEnd might block indefinitely because it does not reach an end, and should be avoided and also you should take care that current position in the string should be at the start.

You can also use ReadAllText like

    // Open the file to read from.
    string readText = File.ReadAllText(path);

which is simple it opens a file, reads all lines and takes care of closing as well.