CODEWITHSUNDEEP
c#text-filesstreamreaderwriter
Gamma
Gamma

Reputation: 331

C# How to delete the first line of my text files?

I want to create a Windows Forms app in Visual Studio that writes text files on a button click.

I have a txt file (e.g. test.txt) which contains

AAAA
BBBB
CCCC
DDDD
EOS
FFFF
GGGG
HHHH
IIII
EOS
JJJJ
KKKK
LLLL
MMMM
NNNN
EOS
EOF

Then I would like to split it into number of other txt files

**bag1.txt**
AAAA
BBBB
CCCC
DDDD
EOS

**bag2.txt**
EEEE
FFFF
GGGG
IIII
EOS

**bag3.txt**
JJJJ
KKKK
LLLL
MMMM
NNNN
EOS
EOF

these is the code,

private void read3btn_Click(object sender, EventArgs e)
    {
        string fileName = textBox1.Text;
        TextReader sr = new StreamReader(fileName);
          //This allows you to do one Read operation.

        string s = sr.ReadToEnd();;
        sr.Close();

        string[] bags = s.Split(new string[] {"EOS"}, StringSplitOptions.None);

        // This will give you an array of strings (minus the EOS field)
        // Then write the files...

        System.IO.File.WriteAllText(@"D:\Program-program\tesfile\bag1.txt", bags[0] + "EOS");  //< -- Add this you need the EOS at the end field the field

        System.IO.File.WriteAllText(@"D:\Program-program\tesfile\bag2.txt", bags[1] + "EOS");

        System.IO.File.WriteAllText(@"D:\Program-program\tesfile\bag3.txt", bags[2] + "EOS" + bags[3]);

   }}

Then the output comes this way 

**bag1.txt**
    AAAA
    BBBB
    CCCC
    DDDD
    EOS

**bag2.txt**

EEEE
FFFF
GGGG
IIII
EOS

**bag3.txt**

JJJJ
KKKK
LLLL
MMMM
NNNN
EOS
EOF

unfortunately the output in bags[1] and bags[2] has a blank line in the first line, is there anyway to update the code?

Upvotes: 0

Views: 911

Answers (3)

Alex
Alex

Reputation: 7037

Ok, that's not a big problem :) When you read your file, you get a string like "AAA\nBBB\nCCC\nDDD\nEOS\nEEE\nFFF\n...EOS\nJJJ\n..." If tou trim the string only on "EOS", you get this:

"AAA\nBBB\nCCC\nDDD\n" "\nEEE\nFFF\n..." "\nJJJ..."

Because the Split() method removes the "EOS" string, but not the new line it follows :)

string[] bags = s.Split(new string[] {"EOS\n"}, StringSplitOptions.None);

..this should work fine :)

Upvotes: 0

SLaks
SLaks

Reputation: 887797

Call .Trim() to remove the leading whitespace.

Upvotes: 1

Greg Hewgill
Greg Hewgill

Reputation: 994011

Your "EOS" separator does not contain a newline. Try:

string[] bags = s.Split(new string[] {"EOS\n"}, StringSplitOptions.None);

Your input file is

...DDDD\nEOS\nEEEE\n...

After splitting with your code, you get:

...DDDD\n  EOS  \nEEEE\n...

Notice the leading \n before EEEE. By including \n in your separator, you will get:

...DDDD\n  EOS\n  EEEE\n...

Upvotes: 1

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