Initial data commit

Task/FASTA-format/C-sharp/fasta-format.cs

@@ -0,0 +1,52 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Text;
+
+class Program
+{
+    public class FastaEntry
+    {
+        public string Name { get; set; }
+        public StringBuilder Sequence { get; set; }
+    }
+
+    static IEnumerable<FastaEntry> ParseFasta(StreamReader fastaFile)
+    {
+        FastaEntry f = null;
+        string line;
+        while ((line = fastaFile.ReadLine()) != null)
+        {
+            // ignore comment lines
+            if (line.StartsWith(";"))
+                continue;
+
+            if (line.StartsWith(">"))
+            {
+                if (f != null)
+                    yield return f;
+                f = new FastaEntry { Name = line.Substring(1), Sequence = new StringBuilder() };
+            }
+            else if (f != null)
+                f.Sequence.Append(line);
+        }
+        yield return f;
+    }
+
+    static void Main(string[] args)
+    {
+        try
+        {
+            using (var fastaFile = new StreamReader("fasta.txt"))
+            {
+                foreach (FastaEntry f in ParseFasta(fastaFile))
+                    Console.WriteLine("{0}: {1}", f.Name, f.Sequence);
+            }
+        }
+        catch (FileNotFoundException e)
+        {
+            Console.WriteLine(e);
+        }
+        Console.ReadLine();
+    }
+}