Setting Cookies in Silverlight

nikola — Mon, 14 Apr 2008 20:32:00 GMT

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

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Setting Cookies in Silverlight