System.Windows.AssemblyPart.Load C# (CSharp) Method

		public Assembly Load (Stream assemblyStream)
		{
			// SL2 throws a NullReferenceException if assemblyStream is null
			// but returns null if the stream is empty (e.g. Stream.Null)
			if (assemblyStream.Length == 0)
				return null;

			byte[] buffer = null;
			// avoid extra step for MemoryStream (but not any stream that inherits from it)
			if (assemblyStream.GetType () == MemoryStreamType)
				buffer = (assemblyStream as MemoryStream).ToArray ();
			else
				buffer = StreamToBuffer (assemblyStream);

			try {
				Assembly result = Assembly.Load (buffer);
				if (!Deployment.Current.Assemblies.Contains (result))
					Deployment.Current.Assemblies.Add (result);	
				return result;
			}
			catch {
				return null;
			}
		}
	}

        /// <summary>
        /// 从XAP包中返回程序集信息
        /// </summary>
        /// <param name="packageStream">Xap Stream</param>
        /// <returns>入口程序集</returns>
        public static Assembly LoadAssemblyFromXap(Stream packageStream)
        {
            // 加载AppManifest.xaml
            Stream stream = Application.GetResourceStream(new StreamResourceInfo(packageStream, null), new Uri("AppManifest.xaml", UriKind.Relative)).Stream;
            XmlReader xmlReader = XmlReader.Create(stream);

            // 读取程序集信息
            Assembly entryAssembly = null;
            string entryAssemblyName = string.Empty;
            var assemblyPartInfos = new List<AssemblyPartInfo>();
            while (xmlReader.Read())
            {
                switch (xmlReader.NodeType)
                {
                    case XmlNodeType.Element:
                        if (xmlReader.Name == "Deployment")
                        {
                            // 入口程序集名称
                            entryAssemblyName = xmlReader.GetAttribute("EntryPointAssembly");
                        }
                        else if (xmlReader.Name == "AssemblyPart")
                        {
                            var name = xmlReader.GetAttribute("x:Name");
                            var source = xmlReader.GetAttribute("Source");

                            assemblyPartInfos.Add(new AssemblyPartInfo { Name = name, Source = source });
                        }
                        break;
                    default:
                        break;
                }
            }

            var assemblyPart = new AssemblyPart();
            // 加载程序集
            foreach (var assemblyPartInfo in assemblyPartInfos)
            {
                StreamResourceInfo streamInfo = Application.GetResourceStream(new StreamResourceInfo(packageStream, "application/binary"), new Uri(assemblyPartInfo.Source, UriKind.Relative));
                // 入口程序集
                if (assemblyPartInfo.Name == entryAssemblyName)
                {
                    entryAssembly = assemblyPart.Load(streamInfo.Stream);
                }
                // 其他程序集
                else
                {
                    assemblyPart.Load(streamInfo.Stream);
                }
            }

            return entryAssembly;
        }