實例代碼演示Asp.Net中對Cookie的基本操作。
Imports System.Web.HttpContext
Public Class CookieFramework
'寫入單個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
'給Cookie集合添加子項
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
'讀取單個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
'讀取Cookie集合中的子項內容
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
'刪除整個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
'刪除Cookie集合中的子項
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
