asp.net cookie操作实例学习

 // Summary:
 //  Provides a type-safe way to create and manipulate individual HTTP cookies.
 public sealed class HttpCookie
 {
  // Summary:
  //  Creates and names a new cookie.
  //
  // Parameters:
  //   name:
  //  The name of the new cookie.
  public HttpCookie(string name);
  //
  // Summary:
  //  Creates, names, and assigns a value to a new cookie.
  //
  // Parameters:
  //   name:
  //  The name of the new cookie.
  //
  //   value:
  //  The value of the new cookie.
  public HttpCookie(string name, string value);

  // Summary:
  //  Gets or sets the domain to associate the cookie with.
  //
  // Returns:
  //  The name of the domain to associate the cookie with. The default value is
  //  the current domain.
  public string Domain { get; set; }
  //
  // Summary:
  //  Gets or sets the expiration date and time for the cookie.
  //
  // Returns:
  //  The time of day (on the client) at which the cookie expires.
  public DateTime Expires { get; set; }
  //
  // Summary:
  //  Gets a value indicating whether a cookie has subkeys.
  //
  // Returns:
  //  true if the cookie has subkeys, otherwise, false. The default value is false.
  public bool HasKeys { get; }
  //
  // Summary:
  //  Gets or sets a value that specifies whether a cookie is accessible by client-side
  //  script.
  //
  // Returns:
  //  true if the cookie has the HttpOnly attribute and cannot be accessed through
  //  a client-side script; otherwise, false. The default is false.
  public bool HttpOnly { get; set; }
  //
  // Summary:
  //  Gets or sets the name of a cookie.
  //
  // Returns:
  //  The default value is a null reference (Nothing in Visual Basic) unless the
  //  constructor specifies otherwise.
  public string Name { get; set; }
  //
  // Summary:
  //  Gets or sets the virtual path to transmit with the current cookie.
  //
  // Returns:
  //  The virtual path to transmit with the cookie. The default is the path of
  //  the current request.
  public string Path { get; set; }
  //
  // Summary:
  //  Gets or sets a value indicating whether to transmit the cookie using Secure
  //  Sockets Layer (SSL)--that is, over HTTPS only.
  //
  // Returns:
  //  true to transmit the cookie over an SSL connection (HTTPS); otherwise, false.
  //  The default value is false.
  public bool Secure { get; set; }
  //
  // Summary:
  //  Gets or sets an individual cookie value.
  //
  // Returns:
  //  The value of the cookie. The default value is a null reference (Nothing in
  //  Visual Basic).
  public string Value { get; set; }
  //
  // Summary:
  //  Gets a collection of key/value pairs that are contained within a single cookie
  //  object.
  //
  // Returns:
  //  A collection of cookie values.
  public NameValueCollection Values { get; }

  // Summary:
  //  Gets a shortcut to the System.Web.HttpCookie.Values property. This property
  //  is provided for compatibility with previous versions of Active Server Pages
  //  (ASP).
  //
  // Parameters:
  //   key:
  //  The key (index) of the cookie value.
  //
  // Returns:
  //  The cookie value.
  public string this[string key] { get; set; }
 }

if (Request.Cookies["Student"] != null)
{
   string firstName = Server.HtmlEncode(Request.Cookies["Student"]["FirstName"]);
   string lastName = Server.HtmlEncode(Request.Cookies["Student"]["LastName"]);
}

Cookie中的子键被类型化为NameValueCollection类型集合
if (Request.Cookies["Student"] != null)
{
 NameValueCollection collection = Request.Cookies["Student"].Values;
}

int counter;
if (Request.Cookies["counter"] == null)
 counter = 0;
else
{
 counter = int.Parse(Request.Cookies["counter"].Value);
}
counter++;

Response.Cookies["counter"].Value = counter.ToString();
Response.Cookies["counter"].Expires = DateTime.Now.AddDays(1);