Question 134823 in Visual Studio Code Question posted in
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Visual Studio Code – When using StreamReader the file isn't read

When I use StreamReader` for some reason the file I use isn’t read. can I get any help?

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I tried deleting the file and putting it in again but it didn’t work

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3

Answers


  1. 0

    line is initialized to "", so the while loop is never entered. The condition should be line != null, not line == null like you currently have.

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  2. 0

    Your while loop condition is not correct it should be while(line != null), first of all line is initialized to empty string ("") so with current code the loop is never entered, secondary line = b.ReadLine(); should not be null until the file ends – from the StreamReader.ReadLine docs:

    Returns String
    The next line from the input stream, or null if the end of the input stream is reached.

    Also this makes inner check if(line != null) obsolete.

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  3. 0

    Your while is not correct; just have a look:

    ...
string line = "";

// line is NOT null (it's empty) that's why
// while will not enter at all
while (line == null) 
{
...
}

    Let’s change while into for, let pesky line (which is declared out of loop, is check in while, in if etc.) be a loop variable:

    // Wrap IDisposable into using; do not Close them expplicitly
using (StreamReader b = new StreamReader("students.txt")) 
{
    ...
    for (string line = b.ReadLine(); line != null; line = b.ReadLine()) 
    {
        if (line == "2") { num2++; }
    ...
    }
    ...
}
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