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POResearching efficient searching of text inside a directory and its subdirectories using C#
 

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  1. POResearching efficient searching of text inside a directory and its subdirectories using C#
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    <p>I am trying to search for a particular occurrence of a string in some files belonging to a directory. (The search is also performed in the sub directories. Currently, I came up with a solution something like this.</p> <ol> <li>Get all filenames inside a directory and its sub directories.</li> <li>Open files one by one.</li> <li>Search for a particular string</li> <li>If it contains, store filename in an array.</li> <li><p>Continue this till the last file. </p> <pre><code>string[] fileNames = Directory.GetFiles(@"d:\test", "*.txt", SearchOption.AllDirectories); foreach (string sTem in fileNames) { foreach (string line in File.ReadAllLines(sTem)) { if (line.Contains(SearchString)) { MessageBox.Show("Found search string!"); break; } } } </code></pre></li> </ol> <p>I think there can be other methods/approach efficient and speeder than this? Using a batch file? OK. Another, solution is to use findstr (but how to use it directly with C# program without a batch file ? What is the most efficient (or more efficient than what I did?) Code examples are much appreciated!</p> <p>Found out another solution.</p> <pre><code>Process myproc = new Process(); myproc.StartInfo.FileName = "findstr"; myproc.StartInfo.Arguments = "/m /s /d:\"c:\\REQs\" \"madhuresh\" *.req"; myproc.StartInfo.RedirectStandardOutput = true; myproc.StartInfo.UseShellExecute = false; myproc.Start(); string output = myproc.StandardOutput.ReadToEnd(); myproc.WaitForExit(); </code></pre> <p>Is this execution of a process good ? Comments on this too are welcome!</p> <p>According to the @AbitChev's method, a sleek (I don't know if it's efficient!). Anyways, it goes on like this. This one searches all the directory as well as the subdirectories!</p> <pre><code>IEnumerable&lt;string&gt; s = from file in Directory.EnumerateFiles("c:\\directorypath", "*.req", SearchOption.AllDirectories) from str in File.ReadLines(file) //where str.Contains("Text@tosearched2") where str.IndexOf(sSearchItem, StringComparison.OrdinalIgnoreCase) &gt;= 0 select file; foreach (string sa in s) MessageBox.Show(sa); </code></pre> <p>(for case-insensitive search. Maybe that could help someone.) Please comment! Thanks.</p>
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    1. CO`File.ReadAllLines` loads the whole file into memory, as long as it fits.
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    2. COYes I know that Jodrell. So, whats the next available way ? an efficient way ofcourse!
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    3. COAlso you can download and run [Win32 port of GNU Grep](http://gnuwin32.sourceforge.net/packages/grep.htm)
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      1. USabatishchev
 

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