I think this is for an expert!!.. coz` no one knowes it..
Can anyone tell how to insert a new line in a file
Example: test.txt
line 1
line 2
line 3
line 4
line 6
line 7
line 8
after the insertion of the line...
line 1
line 2
line 3
line 4
line 5
line 6
line 7
line 8
i tryed to use the seek() method.. it works but he overides the other lines..
Anyone know how to do that
I think this is for an expert!!.. coz` no one knowes it..
Dehim
You will have to rewrite the file
Read lines from input file
Output to temporary file
Hit insert place, write insert line to temp file
Continue to read from input file and write to temp file
Finish read/write
Delete original file
Rename/move temp file to original file
Dave Wickert
Someone mentioned SQLExpress ... another item to see is SQLite whcih is an embedded database.
You can download SQLite http://www.sqlite.org/ there are also managed providers available http://sourceforge.net/projects/adodotnetsqlite/
Here is a quick article on it :) http://www.eggheadcafe.com/articles/20040714.asp
Cheers,
Greg
caiman
Have you considered SQL Server 2005 Express Edition It's free, and allows you to create databases of up to 4GB.
-Tom Meschter
Software Dev, Visual C# IDE
virayanna
The filesystem does not know you want to insert a random number of bytes into the file. How do you expect that any part of the file/operating system will understand that you want to insert data into the file
S.Mark
lingga
and that`s not an option..
holzert
hi,
files that hold text are two types
the file that have fixed entery point like .txt which you have to read the file from the beginning to end so if you want to edit something you have to read from the start like my code .
there is other type have random entry point like the .doc files you can seek a particular part and edit it without reading the entire file, you can enter it from any point
i don't know much about the second type because i didn't use it yet
hope this helps
William Gates
it will take lonk lonk ti me antil i delete and i create the file..
isnt a possible way to change that file
Ben Nakagawa
Here's how to connect to the file using a DSN:
http://www.c-sharpcorner.com/database/Connect/ConnectODBCText.asp
If you don't want to use the DSN, you can get the connection string and set up the connection like a normal database connection string (using the ODBC Text driver).
Shiggity
Textfiles are not really good on that part, as you have noticed.
I would probably try to change it to be in a SQL database instead. Much easier to work with than textfiles. If a textfile is required it can be exported from the database.
blettner
delly_jm
It will work, but you would use memory more efficient if you rewrite to a new file as you read it and insert the line when at the appropiate position.
Why cant you add the new lines at the end zapacila
ImagineNation
Jeremy613
loooool
once i was trying to do something like that , here its my code but i don't think its the best thing to do in 300 mb files, path is the path of the file that you want to use, data is the data that you want to insert, linenumber is which line you to insert this data in
public static void InsertIntoFile(string Path, string Data, int LineNumber)
{
StringBuilder result = new StringBuilder();
FileStream fs = new FileStream(Path, FileMode.Open, FileAccess.ReadWrite);
int lines = 0;
using (StreamReader sr = new StreamReader(fs))
{
string line;
while ((line = sr.ReadLine()) != null)
{
if (lines == (LineNumber - 1))
{
result.Append(Data);
result.Append(" | ");
}
result.Append(line);
result.Append(" | ");
lines++;
}
}
string fullstr = result.ToString();
string[] text = fullstr.Split('|');
using (StreamWriter sw = new StreamWriter(Path))
{
for (int i = 0; i < text.Length; i++)
{
string item = text
sw.WriteLine(item);
Console.WriteLine(item);
}
}
}
hope this helps