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Old February 21st, 2008, 08:18 AM
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Default Read and Edit the text file

Hi,
I am creating an application through which I can read a text file saved on my disk and find the block of strings through specified array of spans (start and end positions of strings to find) then after I need to replace these blocks of string with other block of string and create a new text file so that at the end I can have 2 text files old one and the modified new one.

I am explaining this with an example:--
lets say I have a text file old.txt which contains following data in it:
Find the formula to calculate area of a circle.
Find the formula to calculate area of a square.
Find the formula to calculate area of a rectangle.
Find the formula to calculate area of a tringle.
and so on..

now I need to modify this text file with following new data and create the new.txt file for which I will pass the span values of "formula" like start value=9 and end value=16 for 1st sentence and so on..:
Find the <Math> formula <Equation> to calculate area of a circle.
Find the <Math> formula <Equation> to calculate area of a square.
Find the <Math> formula <Equation> to calculate area of a rectangle.
Find the <Math> formula <Equation> to calculate area of a tringle.


Can anyone help me to acheive this.

Thanks in advance.
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Old February 21st, 2008, 08:39 AM
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If you read the text from the file into an array of strings (e.g. File.ReadAllLines() method), then you just need to do two Insert commands. Use a StringBuilder for your output text.

string[] lines = File.ReadAllLines("C:\\test.txt");

int pos1 = 9;
string insert1 = "<Math>";
int pos2 = 16 + insert1.Length;
string insert2 = "<Equation>";

StringBuilder output = new StringBuilder();

foreach(string s in lines)
{
    string t = s.Insert(pos1, insert1);
    output.Append(t.Insert(pos2, insert2));
}

// now write out output.ToString()

/- Sam Judson : Wrox Technical Editor -/
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Old February 26th, 2008, 03:25 AM
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Thanks for your guidance..
but this approach will not be good if the size of text file is big.
And according to your aproach start and end span is always 9 and 16 respectively but this is not the case, for second sentence span values are 57 and 64 respectively and so on..

Thanks..
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Old February 26th, 2008, 05:35 AM
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My method splits the text file into a number of lines - you are only counting from the start of the line, not from the start of the text file. Therefore assuming your example is a valid example it would be the 9th and 16th characters on each and every line.

/- Sam Judson : Wrox Technical Editor -/
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