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copied!<p>I think that (a) is the best because:</p> <ul> <li>Current Position will be incremented as you read and you don't need to worry about to store it somewhere;</li> <li>You don't need to open it and seek required position (it shouldn't be much slower to reopen but keeping it open gives OS some hints for optimization I believe) each time you poll it;</li> <li>Other solutions I can think out requires PInvokes to system interprocess synchronisation primitives. And they won't be faster than file operations already in framework.</li> </ul> <p>You just need to set proper FileShare flags:</p> <p>Just for example:</p> <p><strong>Server:</strong></p> <pre><code>using(var writer = new BinaryWriter(new FileStream(@"D:\testlog.log", FileMode.Append, FileAccess.Write, FileShare.Read))) { int n; while(Int32.TryParse(Console.ReadLine(), out n)) { writer.Write(n); writer.Flush(); // write cached bytes to file } } </code></pre> <p><strong>Client:</strong> </p> <pre><code>using (var reader = new BinaryReader(new FileStream(@"D:\testlog.log", FileMode.Open, FileAccess.Read, FileShare.ReadWrite))) { string s; while (Console.ReadLine() != "exit") { // allocate buffer for new ints Int32[] buffer = new Int32[(reader.BaseStream.Length - reader.BaseStream.Position) / sizeof(Int32)]; Console.WriteLine("Stream length: {0}", reader.BaseStream.Length); Console.Write("Ints read: "); for (int i = 0; i < buffer.Length; i++) { buffer[i] = reader.ReadInt32(); Console.Write((i == 0 ? "" : ", ") + buffer[i].ToString()); } Console.WriteLine(); } } </code></pre>

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