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常用工具集/Utility/ICSharpCode.SharpZipLib/Core/PathUtils.cs

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+using System;
+using System.IO;
+using System.Linq;
+
+namespace ICSharpCode.SharpZipLib.Core
+{
+	/// <summary>
+	/// PathUtils provides simple utilities for handling paths.
+	/// </summary>
+	public static class PathUtils
+	{
+		/// <summary>
+		/// Remove any path root present in the path
+		/// </summary>
+		/// <param name="path">A <see cref="string"/> containing path information.</param>
+		/// <returns>The path with the root removed if it was present; path otherwise.</returns>
+		public static string DropPathRoot(string path)
+		{
+			var invalidChars = Path.GetInvalidPathChars();
+			// If the first character after the root is a ':', .NET < 4.6.2 throws
+			var cleanRootSep = path.Length >= 3 && path[1] == ':' && path[2] == ':';
+			
+			// Replace any invalid path characters with '_' to prevent Path.GetPathRoot from throwing.
+			// Only pass the first 258 (should be 260, but that still throws for some reason) characters
+			// as .NET < 4.6.2 throws on longer paths
+			var cleanPath = new string(path.Take(258)
+				.Select( (c, i) => invalidChars.Contains(c) || (i == 2 && cleanRootSep) ? '_' : c).ToArray());
+
+			var stripLength = Path.GetPathRoot(cleanPath).Length;
+			while (path.Length > stripLength && (path[stripLength] == '/' || path[stripLength] == '\\')) stripLength++;
+			return path.Substring(stripLength);
+		}
+
+		/// <summary>
+		/// Returns a random file name in the users temporary directory, or in directory of <paramref name="original"/> if specified
+		/// </summary>
+		/// <param name="original">If specified, used as the base file name for the temporary file</param>
+		/// <returns>Returns a temporary file name</returns>
+		public static string GetTempFileName(string original = null)
+		{
+			string fileName;
+			var tempPath = Path.GetTempPath();
+
+			do
+			{
+				fileName = original == null
+					? Path.Combine(tempPath, Path.GetRandomFileName())
+					: $"{original}.{Path.GetRandomFileName()}";
+			} while (File.Exists(fileName));
+
+			return fileName;
+		}
+	}
+}