Added XML comments for the code.

Unzip.cs

@@ -1,8 +1,9 @@
-// Unzip class for .NET 3.5
+// Unzip class for .NET 3.5 Client Profile or Mono 2.10
 // Written by Alexey Yakovlev <[email protected]>
 
 using System;
 using System.Collections.Generic;
+using System.ComponentModel;
 using System.IO;
 using System.IO.Compression;
 using System.Linq;
@@ -13,7 +14,7 @@ namespace Internals
 	/// <summary>
 	/// Unzip helper class.
 	/// </summary>
-	public class Unzip : IDisposable
+	internal class Unzip : IDisposable
 	{
 		private const int EntrySignature = 0x02014B50;
 
@@ -28,32 +29,66 @@ public class Unzip : IDisposable
 		/// </summary>
 		public class Entry
 		{
+			/// <summary>
+			/// Gets or sets the name of a file or a directory.
+			/// </summary>
 			public string Name { get; set; }
 
+			/// <summary>
+			/// Gets or sets the comment.
+			/// </summary>
 			public string Comment { get; set; }
 
+			/// <summary>
+			/// Gets or sets the CRC32.
+			/// </summary>
 			public int Crc32 { get; set; }
 
+			/// <summary>
+			/// Gets or sets the compressed size of the file.
+			/// </summary>
 			public int CompressedSize { get; set; }
 
+			/// <summary>
+			/// Gets or sets the original size of the file.
+			/// </summary>
 			public int OriginalSize { get; set; }
 
-			public int HeaderOffset { get; set; }
-
-			public int DataOffset { get; set; }
-
+			/// <summary>
+			/// Gets or sets a value indicating whether this <see cref="Entry" /> is deflated.
+			/// </summary>
 			public bool Deflated { get; set; }
 
+			/// <summary>
+			/// Gets a value indicating whether this <see cref="Entry" /> is a directory.
+			/// </summary>
 			public bool IsDirectory { get { return Name.EndsWith("/"); } }
 
+			/// <summary>
+			/// Gets a value indicating whether this <see cref="Entry" /> is a file.
+			/// </summary>
 			public bool IsFile { get { return !IsDirectory; } }
+
+			[EditorBrowsable(EditorBrowsableState.Never)]
+			public int HeaderOffset { get; set; }
+
+			[EditorBrowsable(EditorBrowsableState.Never)]
+			public int DataOffset { get; set; }
 		}
 
+		/// <summary>
+		/// Initializes a new instance of the <see cref="Unzip" /> class.
+		/// </summary>
+		/// <param name="fileName">Name of the file.</param>
 		public Unzip(string fileName)
 			: this(File.OpenRead(fileName))
 		{
 		}
 
+		/// <summary>
+		/// Initializes a new instance of the <see cref="Unzip" /> class.
+		/// </summary>
+		/// <param name="stream">The stream.</param>
 		public Unzip(Stream stream)
 		{
 			Stream = stream;
@@ -64,6 +99,10 @@ public Unzip(Stream stream)
 
 		private BinaryReader Reader { get; set; }
 
+		/// <summary>
+		/// Performs application-defined tasks associated with
+		/// freeing, releasing, or resetting unmanaged resources.
+		/// </summary>
 		public void Dispose()
 		{
 			if (Stream != null)
@@ -79,11 +118,15 @@ public void Dispose()
 			}
 		}
 
+		/// <summary>
+		/// Extracts the contents of the zip file to the given directory.
+		/// </summary>
+		/// <param name="directoryName">Name of the directory.</param>
 		public void ExtractToDirectory(string directoryName)
 		{
 			foreach (var entry in Entries.Where(e => !e.IsDirectory))
 			{
-				// create target directory with file folder
+				// create target directory for the file
 				var fileName = Path.Combine(directoryName, entry.Name);
 				var dirName = Path.GetDirectoryName(fileName);
 				Directory.CreateDirectory(dirName);
@@ -96,19 +139,30 @@ public void ExtractToDirectory(string directoryName)
 			}
 		}
 
+		/// <summary>
+		/// Extracts the specified file name.
+		/// </summary>
+		/// <param name="fileName">Name of the file.</param>
+		/// <param name="outputStream">The output stream.</param>
 		public void Extract(string fileName, Stream outputStream)
 		{
 			var entry = Entries.Where(e => e.Name == fileName).First();
 			Extract(entry, outputStream);
 		}
 
+		/// <summary>
+		/// Extracts the specified entry.
+		/// </summary>
+		/// <param name="entry">Zip file entry to extract.</param>
+		/// <param name="outputStream">The stream to write the data to.</param>
+		/// <exception cref="System.InvalidOperationException"> is thrown when the file header signature doesn't match.</exception>
 		public void Extract(Entry entry, Stream outputStream)
 		{
 			// check file signature
 			Stream.Seek(entry.HeaderOffset, SeekOrigin.Begin);
 			if (Reader.ReadInt32() != FileSignature)
 			{
-				throw new InvalidOperationException("File signature don't match.");
+				throw new InvalidOperationException("File signature doesn't match.");
 			}
 
 			// move to file data
@@ -139,6 +193,9 @@ public void Extract(Entry entry, Stream outputStream)
 			}
 		}
 
+		/// <summary>
+		/// Gets the file names.
+		/// </summary>
 		public IEnumerable<string> FileNames
 		{
 			get
@@ -149,6 +206,9 @@ public IEnumerable<string> FileNames
 
 		private Entry[] entries;
 
+		/// <summary>
+		/// Gets zip file entries.
+		/// </summary>
 		public IEnumerable<Entry> Entries
 		{
 			get

Unzip.csproj

@@ -23,6 +23,7 @@
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
     <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
+    <DocumentationFile>bin\Debug\Unzip.XML</DocumentationFile>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <PlatformTarget>AnyCPU</PlatformTarget>

UsageExample.cs

@@ -6,9 +6,9 @@
 
 namespace Internals
 {
-	struct Program
+	internal struct Program
 	{
-		static void Main(string[] args)
+		private static void Main(string[] args)
 		{
 			if (args.Length < 2)
 			{