How to remove data from string builder

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Hi i all having a requirement to delete particular data from a text file. I have written some code to get my exact data to remove but now i am little bit confused in removing that particular data can any one help me.

Initially this is my data in text file where i am storing to a Stringbuilder

101 111111111 1111111111110150105A094101                                                      

52201               1                   1         PPD1         111015111015   1111000020000001

6241110000251                00000000011              1                     1 0111000020000001

822000000100111000020000000000000000000000011                                  111000020000001

52251               1                   1         PPD1         011015111015   1111000020000002

6281110000251                00000000011              1                     1 0111000020000002

822500000100111000020000000000010000000000001                                  111000020000002

9000002000001000000020022200004000000000001000000000001

Now by using certain code i am getting the data to delete i.e assume i would like to delete from 5 to 8 which exists. I am storing this to another StringBuilder as follows

52251               1                   1         PPD1         011015111015   1111000020000002

6281110000251                00000000011              1                     1 0111000020000002

822500000100111000020000000000010000000000001                                  111000020000002

I would like to remove this from the main Stringbuilder i am having. Is this the correct process or if any better way let me know

Posted 14-Oct-11 22:35pm

demouser743

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DaveAuld 15-Oct-11 4:43am

What code are you using? is the text file data line terminated or a single long string? It might be better to work with an array of line entries if it is line terminated.

2 solutions

Solution 1

Yes - deleting from a StringBuilder should be a lot more efficient that creating a new one. If you know the first character index and the length (which you can obviously work out from the total length and the character index) then you can just use the StringBuilder.Remove method[^]

Posted 14-Oct-11 22:46pm

OriginalGriff

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demouser743 15-Oct-11 4:50am

But in my file there is no limit for that. I can have n no of lines from 5 to 8

OriginalGriff 15-Oct-11 4:57am

As long as you know the index of the first character you want to delete (and if you are line based, then you presumably keep a list of line start indices) than deleting to the end is simple.
Or am I misinterpreting your problem?

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André Kraak · Accepted Answer · 2011-10-14T23:30:00

Solution 2

You could try using the content of the second StringBuilder to remove it from the first one by using the Replace[^] method.

It would look something like:

C#

mainStringBuilder.Replace(anotherStringBuilder.ToString(), "");

Posted 14-Oct-11 23:30pm

André Kraak