first commit

DCIT.Core/Utilities/PathUtility.cs

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+using System;
+using System.Collections.Generic;
+using System.IO;
+
+namespace DCIT.Core.Utilities
+{
+    public static class PathUtility
+    {
+        public static string NormalizeDirectory(string path)
+        {
+            if (string.IsNullOrWhiteSpace(path))
+            {
+                return string.Empty;
+            }
+
+            var fullPath = Path.GetFullPath(path.Trim());
+            if (!fullPath.EndsWith(Path.DirectorySeparatorChar.ToString(), StringComparison.Ordinal))
+            {
+                fullPath += Path.DirectorySeparatorChar;
+            }
+
+            return fullPath;
+        }
+
+        public static bool AreSameOrNestedDirectories(string left, string right)
+        {
+            var normalizedLeft = NormalizeDirectory(left);
+            var normalizedRight = NormalizeDirectory(right);
+            if (string.IsNullOrEmpty(normalizedLeft) || string.IsNullOrEmpty(normalizedRight))
+            {
+                return false;
+            }
+
+            return normalizedLeft.Equals(normalizedRight, StringComparison.OrdinalIgnoreCase)
+                || normalizedLeft.StartsWith(normalizedRight, StringComparison.OrdinalIgnoreCase)
+                || normalizedRight.StartsWith(normalizedLeft, StringComparison.OrdinalIgnoreCase);
+        }
+
+        public static string GetRelativePath(string relativeTo, string path)
+        {
+            var root = new Uri(NormalizeDirectory(relativeTo), UriKind.Absolute);
+            var target = new Uri(Path.GetFullPath(path), UriKind.Absolute);
+            var relative = root.MakeRelativeUri(target).ToString().Replace('/', Path.DirectorySeparatorChar);
+            return Uri.UnescapeDataString(relative);
+        }
+
+        public static IEnumerable<string> ValidateDirectoryPair(string firstLabel, string firstPath, string secondLabel, string secondPath)
+        {
+            if (string.IsNullOrWhiteSpace(firstPath) || string.IsNullOrWhiteSpace(secondPath))
+            {
+                yield break;
+            }
+
+            if (AreSameOrNestedDirectories(firstPath, secondPath))
+            {
+                yield return string.Format("{0} 与 {1} 不能相同，也不能互为父子目录。", firstLabel, secondLabel);
+            }
+        }
+    }
+}