在asp.net web应用程序中如果我们想表示用户操作信息，就必须有一些***性标识，下面接口分五层描述用户操作信息：
1.用户名：直接标识操作者用户名
2.用户IP地址：通过IP地址标识操作进行时操作者所在物理机器
3.用户SessionId：用来标识用户浏览器所使用的会话信息，具有线程***性
4.用户操作画面ID：标识用户在所操作的页面
5.用户操作事件ID：标识用户进行操作的事件（服务器端控件ID）
ASP.NET Web应用程序范例代码：
Public Interface IOperatable
Property UserName() As String
Property IPAddress() As String
Property SessionId() As String
Property ScreenId() As String
Property EventId() As String
End Interface
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对于一次服务器端的控件事件，都有***的HTTP请求被发送的服务器端，同时开启***线程来处理此请求。即对于用户操作信息应该具有线程***性，所以定义线程静态变量Current来保存当前线程的用户操作信息，这样在一次赋值后即可通过“OperationInfo.Current”的形式来获得用户操作信息，而无需在各层次的方法间传递用户操作信息。
ASP.NET Web应用程序范例代码：
Imports RichardTsuei.Core
Public Class OperationInfo
Implements IOperatable
< ThreadStatic()> _
Private Shared _Current As IOperatable
Public Property Current() As IOperatable
Get
Return _Current
End Get
Set(ByVal value As IOperatable)
_Current = value
End Set
End Property
Private _UserName As String
Public Property UserName() As String Implements Core.IOperatable.UserName
Get
Return _UserName
End Get
Set(ByVal value As String)
_UserName = value
End Set
End Property
Private _IPAddress As String
Public Property IPAddress() As String Implements Core.IOperatable.IPAddress
Get
Return _IPAddress
End Get
Set(ByVal value As String)
_IPAddress = value
End Set
End Property
Private _SessionId As String
Public Property SessionId() As String Implements Core.IOperatable.SessionId
Get
Return _SessionId
End Get
Set(ByVal value As String)
_SessionId = value
End Set
End Property
Private _ScreenId As String
Public Property ScreenId() As String Implements Core.IOperatable.ScreenId
Get
Return _ScreenId
End Get
Set(ByVal value As String)
_ScreenId = value
End Set
End Property
Private _EventId As String
Public Property EventId() As String Implements Core.IOperatable.EventId
Get
Return _EventId
End Get
Set(ByVal value As String)
_EventId = value
End Set
End Property
End Class
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