StackOverflow2013

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12430606
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2012-09-14T19:12:28.247
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2012-09-14T19:12:28.247
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12429456
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2
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text
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Here's two ways: <pre><code>public static string ReadSpecificLine1( string path , int lineNumber ) { int cnt = 0 ; string desiredLine = File.ReadAllLines( path ).FirstOrDefault( x => (++cnt == lineNumber) ) ; return desiredLine ; } public static string ReadSpecificLine2( string path , int lineNumber ) { string desiredLine = null ; using ( FileStream stream = new FileStream( path , FileMode.Open , FileAccess.Read , FileShare.Read ) ) using ( StreamReader reader = new StreamReader( stream ) ) { int i = 0 ; string line = null ; while ( null != (line=reader.ReadLine()) && ++i < lineNumber ) { } if ( i == lineNumber && line != null ) { desiredLine = line ; } return desiredLine ; } } </code></pre> If you know for certain that your file <ul> <li>Contains only characters that comprise a single, fixed-size Unicode code unit in the file's unicode encoding scheme, and</li> <li>has fixed length lines (records)</li> </ul> Then you can <code>seek()</code> directly to the line in question, as in this example using UTF-16 encoding, thus saving extraneous I/O operations: <pre><code>public static string ReadSpecificLineFromUTF16EncodedFile( string path , int lineNumber ) { string desiredLine = null ; using ( FileStream stream = new FileStream( path , FileMode.Open , FileAccess.Read , FileShare.Read ) ) using ( StreamReader reader = new StreamReader( stream , Encoding.Unicode ) ) { Encoding UTF_16 = Encoding.Unicode ; const int RECORD_LENGTH_IN_CHARS = 80 ; const int FIXED_CODE_UNIT_SIZE_IN_OCTETS = sizeof(char) ; // size of a UTF-16 code unit (char) in octets const int RECORD_LENGTH_IN_OCTETS = RECORD_LENGTH_IN_CHARS * FIXED_CODE_UNIT_SIZE_IN_OCTETS ; long offset = (lineNumber-1)*RECORD_LENGTH_IN_OCTETS ; if ( offset < 0 ) throw new ArgumentOutOfRangeException("lineNumber") ; if ( offset <= stream.Length ) { stream.Seek( offset , SeekOrigin.Begin ) ; desiredLine = reader.ReadLine() ; } } return desiredLine ; } </code></pre> Note that this will only work if the above two conditions are true.
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1. POread line from especific line from file in directory c#
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1. PTAnswer
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1. USNicholas Carey
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