I recently started learning c# So I got a school assignment to make a German grammar-help-tool. It's a group assignment my task is:

The application loads prefabricated sentences from a file, and randomly makes small changes to these sentences. For example, commas can be deleted, ies can be replaced by i, s can be replaced by ss, and so on. The user is presented with the changed sentence, and it is up to him to find the error.

I tried using the string. Replace and streamReader/Writer, but it didn't work.

StreamReader reader = new StreamReader(File.OpenRead(@"C:\Users\kamil\OneDrive\Dokumente\test grammatik.txt"));
string fileContent = reader.ReadToEnd();
reader.Close();
fileContent = fileContent.Replace("tier", "aff");

StreamWriter writer = new StreamWriter(File.OpenWrite("C:\test grammatik.txt"));
writer.Write(fileContent);
writer.Close();

the sentance in the txt file is: "Ein grosses Tier" and I wanted to replace the "Tier" with "Aff" and it's what i expected and I got:

System.IO.IOException: 'The filename, directory name, or volume label syntax is incorrect. : 'C:\Users\kamil\source\repos\test\bin\Debug\netcoreapp3.1\ est grammatik.txt''

in the Line:

StreamWriter writer = new StreamWriter(File.OpenWrite("C:\test grammatik.txt"));

[link to my file]https://www.dropbox.com/s/p0r3us5o0ik0oju/test.zip?dl=0

CodePudding user response：

The issue is with this line

StreamWriter writer = new StreamWriter(File.OpenWrite("C:\test grammatik.txt"));

you need to either make "C:\\test grammatik.txt" or @"C:\test grammatik.txt"

I would not either suggest you write directly to c: root, you might end up getting permission issues, therefore make a temp folder to work on.

In addition as @Panagiotis Kanavos mentioned in a comment, a single backslash is treated as a tab, you can overcome this by a double backslash or adding @ symbol as mentioned in my answer.

CodePudding user response：

The replace function asks for chars, not strings

public String Replace(char oldChar, char newChar);

in most languages strings are defined with " ", in the other hand chars use ' '

Good luck with your hw