Adding a character into a string after a specific character

Question

In order to be able to read a file in asp.net, the file path must be written in this: 1.

C:\\yung\\Desktop

returns however, the string that the fileUpload get returns is 2.

C:\yung\Desktop

After reading the comments i have this code:

        string FilePath = FileUploadPublicInfo.PostedFile.FileName;
        System.IO.StreamReader file = new System.IO.StreamReader(FilePath);
        string line = File.ReadLines(FilePath.ToString()).Skip(4).ToString();

        TextBox1.Text = line.ToString();

But now its giving this error:

System.Linq.Enumerable+<SkipIterator>d__30`1[System.String]

How to solve this problem?

Thank you.

https://stackoverflow.com/questions/6034297/replacing-all-the-chars-to-with-c-sharp might be useful for you — Rafalon, Aug 06 '17 at 10:04

score 2 · Answer 1 · answered Aug 06 '17 at 10:04

2

I'm not so sure I understand the question, but I think you are looking for string.Replace:

string DoubleSlash(string singleSlash)
{
    return singleSlash.Replace(@"\", @"\\");
}

answered Aug 06 '17 at 10:04

Zohar Peled

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@LanYungLee you've tried it, and..? What was wrong? Why does it not answer you question? – pookie Aug 06 '17 at 14:04
I press wrong, i meant to say that there was another problem. – Lan Yung Lee Aug 06 '17 at 14:21
Btw the above code, that i added would not require replacing "\" with "\\" – Lan Yung Lee Aug 06 '17 at 14:22

score 1 · Answer 2 · answered Aug 06 '17 at 10:02

The reason backslashes disappear is that C# compiler treats slashes in string literals as a special "escape" character. Because of this treatment, backslash needs to be encoded as two slashes in a regular string literal.

C# offers two ways of inserting backslashes the way you need:

Use verbatim literals - prefix it with "at" sign, i.e. @"C:\\yung\\Desktop", or
Double each slash - put two slashes for each slash in the result: C:\\\\yung\\\\Desktop

score 1 · Answer 3 · answered Aug 06 '17 at 15:01

Ok, i have manage to solve this problem, turns out it was not reading anything.

This is the code that i finally get:

This is to retrieve the File's path, using this, would give the file path will double slash, so there is not a need for Replace(@"\",@"\")

string FilePath = FileUploadPublicInfo.PostedFile.FileName;

Then read the specified file

System.IO.StreamReader file = new System.IO.StreamReader(FilePath);

If you know which line you specifically want, this retrieves the 5th line

string line = File.ReadLines(FilePath.ToString()).Skip(4).First().ToString();

Thank you so much for your help...

Adding a character into a string after a specific character

3 Answers3