How to change a particular line in text file?

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Hi Guys,

my nant build file,

XML

<target name="replace" descripton="replaces a line">
<property name="txt.file" value="C:\defence.txt" />
<loadfile file="${txt.file}" property="txt.file.content" />
<regex input="${txt.file.content}" pattern="please write regex pattern" />
<echo file="${txt.file}" message="Message to display" append="false" />
</target>

consider this is text file,

VB

element * CHECKEDOUT
element * UsAf_34567 -Strong # Defence1
element * RusAf_24567 -Strong # Defence2
element * ChinaAf_14567 -Strong # Defence3
element * India_12567 -Strong # Defence4
element * NK_10567 -Strong # Defence5
element * main/LATEST -Strong

please let me know how to change fourth(anyline) line, with Germany(this is for example)?

Posted 29-Apr-14 3:44am

tilakmoger

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Sergey Alexandrovich Kryukov 29-Apr-14 11:14am

Why showing some artifact, like a Nant project, manually, not using Paste? What you show in not a valid XML file — look at the first line.
—SA

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Sergey Alexandrovich Kryukov · Answer 1 · 2014-04-29T05:18:00

The only valid way to change anything in a text file is be reading it at least once. Why? Because lines are defined by the positions of end-of-line characters, so the lines have different length. Before you read all lines, you don't know the position of N-the line in the file.

For simple files, you can read it all in memory, and then write it all back, after your modifications. You can use File.ReadAllLines:
http://msdn.microsoft.com/en-us/library/system.io.file.readalllines.aspx[^].

—SA