aCloud是首个为阿拉伯人设计的基于云的网络操作系统(WebOS)，它基于Silverlight 4技术构建，是继SilveOS之后第二个采用该技术的云系统。网络操作系统，也称为WebTop，是一种虚拟操作系统，可以在网络浏览器中运行。aCloud是一个简单的网络操作系统，运行在云端，通过它，用户可以编辑文档、撰写和发送邮件、使用日历、通讯录等。网络操作系统并非真正的操作系统，而是一种应用程序，用户可以通过浏览器在互联网上使用这些基本的日常应用程序。
网络操作系统可以分为多个类别：
云计算是一种基于互联网的计算方式，它按需向计算机和其他设备提供共享资源、软件和信息，就像电力网一样。云是一组服务器的集合，用户与云交互时无需担心其实现方式。
云计算有三种类型：
aCloud基于三层架构：
以下是一个名为Card的用户控件示例，它包含有关当前云用户的个人信息。
<UserControl x:Class="aCloud.Card" ...>
<Grid x:Name="LayoutRoot">
<Border ...>
<Border.Background>
<ImageBrush ImageSource="/aCloud;component/Images/Profile.png" />
</Border.Background>
</Border>
<TextBlock ...>إسم المستخدم</TextBlock>
<TextBlock ...>آخر دخول: 00/00/0000</TextBlock>
<TextBlock ...>عدد مرات الدخول: 00000</TextBlock>
</Grid>
</UserControl>
Card.xaml.vb文件定义了Card控件的后端逻辑，包括属性和事件处理程序。
Imports System.Windows.Media.Imaging
Imports System.IO
Imports aCloud.aCloudService
Partial Public Class Card
Inherits UserControl
Dim MyService As New aCloudServiceSoapClient()
Public Sub New()
InitializeComponent()
End Sub
Public Property Picture As String
Get
Return Nothing
End Get
Set(ByVal value As String)
Dim brush As New ImageBrush()
brush.ImageSource = New BitmapImage(New Uri(value))
PictureBorder.Background = brush
End Set
End Property
Public Property Username As String
Get
Return UsernameTextBlock.Text
End Get
Set(ByVal value As String)
UsernameTextBlock.Text = value
End Set
End Property
Public Property LastLoginDate As String
Get
Return LastLoginDateTextBlock.Text
End Get
Set(ByVal value As String)
LastLoginDateTextBlock.Text = String.Format("آخر دخول: {0}", value)
End Set
End Property
Public Property LoginsNo As String
Get
Return LoginsNoTextBlock.Text
End Get
Set(ByVal value As String)
LoginsNoTextBlock.Text = String.Format("عدد مرات الدخول: {0}", value)
End Set
End Property
Private Sub PictureBorder_MouseLeftButtonUp(ByVal sender As Object, ByVal e As System.Windows.Input.MouseButtonEventArgs) Handles PictureBorder.MouseLeftButtonUp
Dim ofd As New OpenFileDialog()
ofd.Filter = "Image Files |*.jpg;*.png;*.bmp;*.gif"
ofd.Multiselect = False
If ofd.ShowDialog() Then
Dim bi As New BitmapImage()
Dim data(ofd.File.Length) As Byte
ofd.File.OpenRead().Read(data, 0, data.Length)
MyService.UploadAsync(String.Format("aCloud Users/{0}/Picture.jpg", User.ID), data)
bi.SetSource(ofd.File.OpenRead())
Dim img As New ImageBrush()
img.ImageSource = bi
PictureBorder.Background = img
End If
End Sub
End Class
业务逻辑层中有许多函数提供了aCloud的基本功能。以下是一些示例：
<WebMethod()> _
Public Function GetDirectories(ByVal FullName As String) As List(Of String)
Dim contents As New List(Of String)
Dim path As String = Server.MapPath(FullName)
For Each directory In New DirectoryInfo(path).GetDirectories()
contents.Add(<Directory ID=<%= directory.FullName.Substring_(directory.FullName.IndexOf("aCloud Users")) %>>
<Name><%= directory.Name %></Name>
<Items><%= Convert.ToBoolean(directory.GetDirectories().Count + directory.GetFiles().Count) %></Items>
</Directory>.ToString())
Next
Return contents
End Function
<WebMethod()> _
Public Sub DeleteFile(ByVal FullName As String)
Dim path As String = Server.MapPath(FullName)
File.Delete(path)
End Sub
<WebMethod()> _
Public Sub CreateDirectory(ByVal FullName As String)
Dim path As String = Server.MapPath(FullName)
Directory.CreateDirectory(path)
End Sub
<WebMethod()> _
Public Sub Upload(ByVal FullName As String, ByVal data As Byte())
File.WriteAllBytes(HttpContext.Current.Server.MapPath(FullName), data)
End Sub
<?xml version="1.0" encoding="utf-8" ?>
<Users>
<User ID="6451be9f-8a63-409d-87c9-af6c14305fe3">
<Name>admin</Name>
<Password>123</Password>
<CreationDate>4/3/2011</CreationDate>
<LastLoginDate>4/3/2011</LastLoginDate>
<LoginsNo>1</LoginsNo>
<Status>Offline</Status>
</User>
<User ID="86612741-dd32-4d3a-bf16-d8fad6c3f2d0">
<Name>demo</Name>
<Password>demo</Password>
<CreationDate>4/3/2011</CreationDate>
<LastLoginDate>4/16/2011</LastLoginDate>
<LoginsNo>235</LoginsNo>
<Status>Offline</Status>
</User>
<User ID="83c5dff7-00dd-47b3-a63b-750677421220">
<Name>test</Name>
<Password>test</Password>
<CreationDate>4/16/2011</CreationDate>
<LastLoginDate>4/25/2011</LastLoginDate>
<LoginsNo>12</LoginsNo>
<Status>Offline</Status>
</User>
</Users>