Need help in writing on a file in c#

Question

5.00/5 (1 vote)

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I have to call this function many times

        public void Insert(string name, string DT, int scope)
        {
            FileStream fHandler = new FileStream("c:\\SymbolTable.txt", FileMode.Append);
            fHandler.Close();
            StreamWriter sEntry = new StreamWriter("c:\\SymbolTable.txt");
            sEntry.WriteLine(name + "," + DT + "," + scope);
            sEntry.Close();
}

calling method in another class

C#

HelpingFunctions hF = new HelpingFunctions();
            hF.Insert("gh", "ggh", 0);
           hF.Insert("gh", "ggh", 1);

the problem is that my file only contains the last entry

Posted 20-Dec-11 22:31pm

Sweety Khan

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2 solutions

Solution 2

use this one :

C#

public void Insert(string name, string DT, int scope)
{
    //FileStream fHandler = new FileStream("d:\\SymbolTable.txt", FileMode.Append);
    //fHandler.Close();
    StreamWriter sEntry = new StreamWriter("d:\\SymbolTable.txt", true);
    sEntry.WriteLine(name + "," + DT + "," + scope);
    sEntry.Close();
}

Excuse me that I commented out the first two lines but I didn't get its purpose if you want to append data.

Hope it helps.

Posted 20-Dec-11 22:40pm

Amir Mahfoozi

v2

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OriginalGriff · Accepted Answer · 2011-12-20T22:40:00

Solution 1

Well, yes. It will be only the last entry.
You open it for append (using fHandler) then close that and re-open it with a StreamWriter - which destroys any existing content.

Replace your entire method with:

C#

public void Insert(string name, string DT, int scope)
    {
    using (StreamWriter sw = File.AppendText("c:\\SymbolTable.txt"))
        {
        sw.WriteLine(name + "," + DT + "," + scope);
        }
    }

Posted 20-Dec-11 22:40pm

OriginalGriff

Comments

Sweety Khan 21-Dec-11 4:45am

ohhh. Thanx :)

Sweety Khan 21-Dec-11 4:48am

how strange. output is this gh,ggh,1
gh,ggh,0
gh,ggh,1
y 3 entries n out of order? :(

OriginalGriff 21-Dec-11 5:03am

At a guess, you are not clearing the file content at startup (or preferably, renaming it to a backup)
Look at the File.Move and File.Delete methods.

Sweety Khan 21-Dec-11 5:12am

thanx its done by using file.delete

Sweety Khan 21-Dec-11 4:55am

i got the problem whenever program runs, and fn calls it append on the same file used by the last run. tell me somthing i write on the end of the program so tht it destroys