1. 写cookie

  Dim JSONCookie As New HttpCookie("JSONDATA")
    JSONCookie.Expires = DateTime.Now.AddMinutes(480)
    JSONCookie.Value = cookiestr
 
    HttpContext.Current.Response.Cookies.Add(JSONCookie)

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2. 读cookie

Dim Jsonstr As String = HttpContext.Current.Request.Cookies("JSONDATA").Value.ToString

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3.判断cookie 是否vb.net教程存在

If Request.Cookies("JSONDATA") Is Nothing Then
           
 End If