Imports System.Web.HttpContext
Public Class CookieFramework
'写入单个Cookie
Public Shared Function WriteCookie(ByVal CookieName As String, ByVal CookieValue As String, ByVal ExpiresDate As Integer) As Boolean
Dim aCookie As New HttpCookie(CookieName)
aCookie.Value = CookieValue
aCookie.Expires = DateTime.Now.AddDays(ExpiresDate)
System.Web.HttpContext.Current.Response.Cookies.Add(aCookie)
End Function

'给Cookie集合添加子项
Public Shared Function WriteCookies(ByVal CookieName As String, ByVal CookieItem As String, ByVal ItemValue As String, ByVal ExpiresDate As Integer) As Boolean
Dim aCookie As HttpCookie
If Current.Request.Cookies(CookieName) Is Nothing Then
aCookie = New HttpCookie(CookieName)
Else
aCookie = Current.Request.Cookies(CookieName)
End If
aCookie.Values(CookieItem) = ItemValue
aCookie.Expires = DateTime.Now.AddDays(ExpiresDate)
System.Web.HttpContext.Current.Response.Cookies.Add(aCookie)
End Function
'读取单个Cookie
Public Shared Function ReadCookie(ByVal CookieName As String) As String
If Current.Request.Cookies(CookieName) Is Nothing Then
Return Nothing
Else
Return Current.Request.Cookies(CookieName).Value
End If
End Function

'读取Cookie集合中的子项内容
Public Shared Function ReadCookies(ByVal CookieName As String, ByVal CookieItem As String) As String
If Current.Request.Cookies(CookieName) Is Nothing Then
Return Nothing
Else
If Current.Request.Cookies(CookieName).Values(CookieItem) Is Nothing Then
Return Nothing
Else
Return Current.Request.Cookies(CookieName).Values(CookieItem)
End If
End If
End Function
'删除整个Cookie
Public Shared Function DeleteCookie(ByVal CookieName As String) As Boolean
Dim aCookie As New HttpCookie(CookieName)
Dim i As Integer
Dim limit As Integer = Current.Request.Cookies.Count - 1
For i = 0 To limit
aCookie = Current.Request.Cookies(i)
aCookie.Expires = DateTime.Now.AddDays(-1)
Current.Response.Cookies.Add(aCookie)
Next
End Function
'删除Cookie集合中的子项
Public Shared Function DeleteCookies(ByVal CookieName As String, ByVal ItemName As String) As Boolean
Dim aCookie As HttpCookie = Current.Request.Cookies(CookieName)
aCookie.Values.Remove(ItemName)
aCookie.Expires = DateTime.Now.AddDays(1)
Current.Response.Cookies.Add(aCookie)
End Function
End Class

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