search string in txtfile

Question

0.00/5 (No votes)

See more:

hi I want to find string in text file(e.g C:\send.txt) in my windows form.
but I don't know what is code of this?

thanks for help.

Edit OP comment from solution:-
sorry
my pattern for save text in my file is :

154879,1234567895148726935
159874,5649872315487623148
154879,3025421056897461250
.
.
.

it is two section.

OP also states file is 3000+ lines

Posted 4-Jan-15 5:52am

Member 11351284

Updated 4-Jan-15 7:25am

CHill60

v2

Add a Solution

Comments

Maciej Los 4-Jan-15 16:04pm

Have you tried anything?

3 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Sergey Alexandrovich Kryukov · Answer 1 · 2015-01-04T08:28:00

It depends on the size of the file. If the files are small enough, you can use Solution 2. If the files are too big for that, you would need to read line by line and do the search in each line. You can choose to read the bigger chunk of lines and perform the search in the chunk.

More importantly, you can improve representation of data. As those strings represent numbers, you can store binary numbers, which would be much faster. Also, you could greatly accelerate search by having your lines (or numbers) sorted. The lines are of the same size, so you could have index file (or data in memory) indexing location of each line (or number, or pair of numbers). You could dramatically accelerate the search if you cannot sort the file itself, but sort the data in index file according your priority. Of course, it all worth doing if your files are big enough and throughput is important.

—SA

DamithSL · Answer 2 · 2015-01-04T05:57:00

Solution 2

you can read file text into string as below

C#

string readText = File.ReadAllText(path);

then you can search within the string [^]

Posted 4-Jan-15 5:57am

DamithSL

Comments

CHill60 4-Jan-15 13:26pm

OP trying to contact you by posting another solution (removed)... quote...
thanks DamithSL.
but my file's size is big about 3000 lines!
this solution is not Optimized.

Sergey Alexandrovich Kryukov 4-Jan-15 14:30pm

I voted 4. You considered only one case, when the files are small enough for this. Also, the form of data presentation could be questioned. Please see my answer (where your solution is credited).
—SA

Maciej Los · Answer 3 · 2015-01-04T10:09:00

The simplest way to import data from comma delimited file is to use ADO.NET[^]. And of course, as Sergey mentioned, it depends on many factors.

See my past answers:
How to read from csv file using c#[^]
How change the Delimited character when using MS.ACE.OLEDB to read Text file[^]

Try to do something, then come back here and ask detailed question.

search string in txtfile

3 solutions

Solution 4

Solution 2

Solution 5

Add your solution here

Preview 0