How do I read I character from streamreader C#

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1.00/5 (2 votes)

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I need to read i character using StreamReader and then write it to the outputStream maybe it should be MemoryStream. using Streamwriter.Write(). I'm always getting in my test cases null answer.
here are my testcases.

[TestCase(new char[] { })]
        [TestCase(new char[] { 'a' })]
        [TestCase(new char[] { 'a', 'b' })]
        [TestCase(new char[] { 'a', 'b', 'c' })]
        [TestCase(new char[] { 'a', 'b', 'c', 'a' })]
        [TestCase(new char[] { 'a', 'b', 'c', 'a', 'b' })]
        [TestCase(new char[] { 'a', 'b', 'c', 'a', 'b', 'c' })]

What I have tried:

public static void ReadAndWriteChars(StreamReader streamReader, StreamWriter outputWriter)
{
char x;
while (!streamReader.EndOfStream)
{
x = (char)streamReader.Read();
outputWriter.Write(x);
}
}

Posted 24-Aug-22 22:17pm

Thuthutka

Updated 25-Aug-22 0:15am

v3

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Richard Deeming 25-Aug-22 4:26am

We have no way of answering that - we don't have access to your stream, so we can't see what you're doing wrong. All we can tell you is that the reader is returning \u0000 as its first character. If that's not what you were expecting, then you need to look at the code that sets up the reader.

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OriginalGriff · Answer 1 · 2022-08-24T22:33:00

Without access to the rest of your code and the data you are processing, we can't really do much other than try it locally:

private void MyButton_Click(object sender, EventArgs e)
    {
    using (StreamReader sr = new StreamReader(@"D:\Test Data\MyText.txt"))
        {
        using (StreamWriter sw = new StreamWriter(@"D:\Temp\MyText.txt"))
            {
            ReadAndWriteChars(sr, sw);
            }
        }
    }
public static void ReadAndWriteChars(StreamReader streamReader, StreamWriter outputWriter)
    {
    char x;
    while (!streamReader.EndOfStream)
        {
        x = (char)streamReader.Read();
        outputWriter.Write(x);
        }
    }

If I run that, I get an identical copy of my input file.
So, it's something you are doing elsewhere, or it's the data you are processing - and we have no access to either of those!

So, it's going to be up to you.
Fortunately, you have a tool available to you which will help you find out what is going on: the debugger. If you don't know how to use it then a quick Google for "Visual Studio debugger" should give you the info you need.

Put a breakpoint on the first line in the function, and run your code through the debugger. Then look at your code, and at your data and work out what should happen manually. Then single step each line checking that what you expected to happen is exactly what did. When it isn't, that's when you have a problem, and you can back-track (or run it again and look more closely) to find out why.

Sorry, but we can't do that for you - time for you to learn a new (and very, very useful) skill: debugging!