init

Common/DTS.Common.Utilities/.svn/pristine/3b/3bfe969c7d4d06703a067b4132a5888d4ab7fb58.svn-base

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+using System;
+using System.Collections.Generic;
+using System.Runtime.InteropServices;
+
+namespace DTS.Common.Utilities
+{
+    /// <summary>
+    /// this is a class for doing natural string compares like in explorer (using the explorer function)
+    /// http://msdn.microsoft.com/en-us/library/bb759947%28VS.85%29.aspx
+    /// </summary>
+    /// <remarks>requires XP or greater</remarks>
+    public class NaturalStringComparer : IComparer<string>
+    {
+        [DllImport("shlwapi.dll", CharSet = CharSet.Unicode, ExactSpelling = true)]
+        static extern int StrCmpLogicalW(String x, String y);
+
+        /// <summary>
+        /// do a natural string compare between two strings
+        /// </summary>
+        /// <param name="x">left string to compare</param>
+        /// <param name="y">right string to compare</param>
+        /// <returns>-1 if natural order of x is less than y, +1 if x is after y, 0 if they are equal</returns>
+        public int Compare(string x, string y)
+        {
+            if (null == x) { return -1; }
+            if (null == y) { return 1; }
+            return StrCmpLogicalW(x, y);
+        }
+
+        public static int StaticCompare(string x, string y)
+        {
+            if (null == x) { return -1; }
+            if (null == y) { return 1; }
+            return StrCmpLogicalW(x, y);
+        }
+    }
+}