Setting Cookies in Silverlight
Here is a simple way to set, retrieve and delete cookies from within a Silverlight application.
Click here to open below source code (Cookies.cs)
/// <summary>
/// sets a persistent cookie with huge expiration date
/// </summary>
/// <param name="key">the cookie key</param>
/// <param name="value">the cookie value</param>
private static void SetCookie(string key, string value)
{
string oldCookie = HtmlPage.Document.GetProperty("cookie") as String;
DateTime expiration = DateTime.UtcNow + TimeSpan.FromDays(2000);
string cookie = String.Format("{0}={1};expires={2}", key, value, expiration.ToString("R"));
HtmlPage.Document.SetProperty("cookie", cookie);
}
/// <summary>
/// Retrieves an existing cookie
/// </summary>
/// <param name="key">cookie key</param>
/// <returns>null if the cookie does not exist, otherwise the cookie value</returns>
private static string GetCookie(string key)
{
string[] cookies = HtmlPage.Document.Cookies.Split(';');
key += '=';
foreach (string cookie in cookies)
{
string cookieStr = cookie.Trim();
if (cookieStr.StartsWith(key, StringComparison.OrdinalIgnoreCase))
{
string[] vals = cookieStr.Split('=');
if (vals.Length >= 2)
{
return vals[1];
}
return string.Empty;
}
}
return null;
}
/// <summary>
/// Deletes a specified cookie by setting its value to empty and expiration to -1 days
/// </summary>
/// <param name="key">the cookie key to delete</param>
private static void DeleteCookie(string key)
{
string oldCookie = HtmlPage.Document.GetProperty("cookie") as String;
DateTime expiration = DateTime.UtcNow - TimeSpan.FromDays(1);
string cookie = String.Format("{0}=;expires={1}", key, expiration.ToString("R"));
HtmlPage.Document.SetProperty("cookie", cookie);
}
For more cookie properties (such as restrict access to a certain path/domain), see http://msdn2.microsoft.com/en-us/library/ms533693(VS.85).aspx
Attachment(s): Cookies.cs
