Initial data commit

Task/Find-common-directory-path/C-sharp/find-common-directory-path.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace RosettaCodeTasks
+{
+
+	class Program
+	{
+		static void Main ( string[ ] args )
+		{
+			FindCommonDirectoryPath.Test ( );
+		}
+
+	}
+
+	class FindCommonDirectoryPath
+	{
+		public static void Test ( )
+		{
+			Console.WriteLine ( "Find Common Directory Path" );
+			Console.WriteLine ( );
+			List<string> PathSet1 = new List<string> ( );
+			PathSet1.Add ( "/home/user1/tmp/coverage/test" );
+			PathSet1.Add ( "/home/user1/tmp/covert/operator" );
+			PathSet1.Add ( "/home/user1/tmp/coven/members" );
+			Console.WriteLine("Path Set 1 (All Absolute Paths):");
+			foreach ( string path in PathSet1 )
+			{
+				Console.WriteLine ( path );
+			}
+			Console.WriteLine ( "Path Set 1 Common Path: {0}", FindCommonPath ( "/", PathSet1 ) );
+		}
+		public static string FindCommonPath ( string Separator, List<string> Paths )
+		{
+			string CommonPath = String.Empty;
+			List<string> SeparatedPath = Paths
+				.First ( str => str.Length == Paths.Max ( st2 => st2.Length ) )
+				.Split ( new string[ ] { Separator }, StringSplitOptions.RemoveEmptyEntries )
+				.ToList ( );
+
+			foreach ( string PathSegment in SeparatedPath.AsEnumerable ( ) )
+			{
+				if ( CommonPath.Length == 0 && Paths.All ( str => str.StartsWith ( PathSegment ) ) )
+				{
+					CommonPath = PathSegment;
+				}
+				else if ( Paths.All ( str => str.StartsWith ( CommonPath + Separator + PathSegment ) ) )
+				{
+					CommonPath += Separator + PathSegment;
+				}
+				else
+				{
+					break;
+				}
+			}
+			
+			return CommonPath;
+		}
+	}
+}