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    <p>Open a <code>TextReader</code> (e.g. by <code>File.OpenText</code> - note that <a href="http://msdn.microsoft.com/en-us/library/system.io.file.aspx" rel="nofollow"><code>File</code></a> is a static class, so you <em>can't</em> create an instance of it) and repeatedly call <a href="http://msdn.microsoft.com/en-us/library/0w3csw16.aspx" rel="nofollow"><code>Read</code></a>. That returns <code>int</code> rather than <code>char</code> so it can <em>also</em> indicate end of file:</p> <pre><code>int readResult = reader.Read(); if (readResult != -1) { char nextChar = (char) readResult; // ... } </code></pre> <p>Or to loop:</p> <pre><code>int readResult; while ((readResult = reader.Read()) != -1) { char nextChar = (char) readResult; // ... } </code></pre> <p>Or for more funky goodness:</p> <pre><code>public static IEnumerable&lt;char&gt; ReadCharacters(string filename) { using (var reader = File.OpenText(filename)) { int readResult; while ((readResult = reader.Read()) != -1) { yield return (char) readResult; } } } ... foreach (char c in ReadCharacters("foo.txt")) { ... } </code></pre> <p>Note that all by default, <code>File.OpenText</code> will use an encoding of UTF-8. Specify an encoding explicitly if that isn't what you want.</p> <p>EDIT: To find the end of a line, you'd check whether the character is <code>\n</code>... you'd potentially want to handle <code>\r</code> specially too, if this is a Windows text file.</p> <p>But if you want each <em>line</em>, why not just call <code>ReadLine</code>? You can always iterate over the characters in the line afterwards...</p>
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    1. POC# - Read External CSV File Character by Character
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    1. COI assume the OP wants to iterate _all_ characters in the file("_read a file character by character_").
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      1. USTim Schmelter
    2. CO@TimSchmelter: So they'd need to loop until it returned -1... will edit with more code, but I think this really gives enough information.
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      1. USJon Skeet
    3. COhow would i detect the end of a line though?
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      1. USuser559142
 

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