How can I search for a specific string and return whole line? In VB.NET

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how can I search for a specific string from My.Resources.filetxt and return whole line?

VB

e.g My.Resources.filetxt has following entries say :

england is cold country
england is cold country
england is cold country

now i want to search this txt file for a string "england" and return the entire line containing this string. How can i do it

What I have tried:

Findstring = My.Resources.filetxt
       Lookfor = TextBox2.Text
       'TextBox1.Text = IO.File.ReadAllLines(My.Resources.filetxt).FirstOrDefault(Function(x) x.Contains(Lookfor))

Posted 24-Jan-18 21:20pm

Member 13643438

Updated 24-Jan-18 21:41pm

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OriginalGriff · Answer 1 · 2018-01-24T21:41:00

Two ways to do it:
1) Split the text into separate lines, and search each line for your text. This isn't particularly efficient, particularly if your text is long and contains many lines as it generates a lot of separate strings. It is easy to implement though - a couple of lines of code.
2) Use IndexOf to find each occurance of the string in turn: String.IndexOf Method (String, Int32) (System)[^]. You can then use it again with the returned index to find the end of the line, and String.LastIndexOf Method (String, Int32) (System)[^] to find the beginning. You can then extract the whole line using String.Substring Method (Int32, Int32) (System)[^]. This is a little more work, but will be a lot quicker, and a whole load less of a memory hog!