/// <summary>
/// Event handler attached to "Page.Unload" that sticks marked fields
/// into session state
/// </summary>
/// <param name="o">Object firing the event</param>
/// <param name="e">Event arguments</param>
private void SessionStore(object o, EventArgs e)
{
FieldInfo[] fields = GetType().GetFields(BindingFlags.Public |
BindingFlags.NonPublic |
BindingFlags.Instance);
// Persistent state
HttpCookie pageCookie = new HttpCookie(GetType().FullName);
HttpCookie siteCookie = Request.Cookies[keyPrefix];
if (siteCookie == null)
{
siteCookie = new HttpCookie(keyPrefix);
}
siteCookie.Expires = pageCookie.Expires = DateTime.Now.ToUniversalTime().AddYears(2);
foreach (FieldInfo field in fields)
{
if (field.IsDefined(typeof(PersistentPageStateAttribute), true))
{
if (field.FieldType.IsPrimitive)
{
PersistentPageStateAttribute ppsa =
(PersistentPageStateAttribute)
field.GetCustomAttributes(
typeof(PersistentPageStateAttribute), true)[0];
if (ppsa.keyName == null)
{
pageCookie[Page.Request.Path + ":" + this.UniqueID + "." + field.Name] =
(string)Convert.ChangeType(field.GetValue(this),
typeof(string),
CultureInfo.InvariantCulture);
}
else
{
siteCookie[ppsa.keyName] =
(string)Convert.ChangeType(field.GetValue(this),
typeof(string),
CultureInfo.InvariantCulture);
}
}
else
{
throw new SerializationException(
String.Format("Field '{0}' is not a primitive type", field.Name));
}
}
}
if (pageCookie.Values.Count > 0)
{
Response.AppendCookie(pageCookie);
}
if (siteCookie.Values.Count > 0)
{
Response.AppendCookie(siteCookie);
}
// Transient & Session scope state
foreach (FieldInfo field in fields)
{
if (field.IsDefined(typeof(TransientPageStateAttribute), true) ||
field.IsDefined(typeof(SessionPageStateAttribute), true))
{
if (field.FieldType.IsSerializable)
{
string fieldName;
fieldName = Page.Request.Path + ":" + this.UniqueID + "." + field.Name;
if (field.IsDefined(typeof(SessionPageStateAttribute), true))
{
SessionPageStateAttribute spsa =
(SessionPageStateAttribute)
field.GetCustomAttributes(
typeof(SessionPageStateAttribute), true)[0];
if (spsa.keyName != null)
{
fieldName = keyPrefix + spsa.keyName;
}
}
Session[fieldName] = field.GetValue(this);
}
else
{
throw new SerializationException(
String.Format("Type {0} of field '{0}' is not serializable",
field.FieldType.FullName, field.Name));
}
}
}
}
/// <summary>
/// Event handler attached to "Page.Init" that recovers
/// marked fields from session state
/// </summary>
/// <param name="o">Object firing the event</param>
/// <param name="e">Event arguments</param>
private void SessionLoad(object o, EventArgs e)
{
FieldInfo[] fields = GetType().GetFields(BindingFlags.Public |
BindingFlags.NonPublic |
BindingFlags.Instance);
// Persistent, page scope values
HttpCookie pageCookie = Request.Cookies[GetType().FullName];
if (pageCookie != null)
{
foreach (FieldInfo field in fields)
{
if (field.IsDefined(typeof(PersistentPageStateAttribute),
true) &&
field.FieldType.IsPrimitive)
{
PersistentPageStateAttribute ppsa =
(PersistentPageStateAttribute)
field.GetCustomAttributes(
typeof(PersistentPageStateAttribute), true)[0];
if (ppsa.keyName == null && pageCookie[Page.Request.Path + ":" + this.UniqueID + "." + field.Name] != null)
{
field.SetValue(this,
Convert.ChangeType(pageCookie[Page.Request.Path + ":" + this.UniqueID + "." + field.Name],
field.FieldType,
CultureInfo.InvariantCulture));
}
}
}
}
// Persistent, user scope values
HttpCookie siteCookie = Request.Cookies[keyPrefix];
if (siteCookie != null)
{
foreach (FieldInfo field in fields)
{
if (field.IsDefined(typeof(PersistentPageStateAttribute),
true) &&
field.FieldType.IsPrimitive)
{
PersistentPageStateAttribute ppsa =
(PersistentPageStateAttribute)
field.GetCustomAttributes(
typeof(PersistentPageStateAttribute), true)[0];
if (ppsa.keyName != null && siteCookie[ppsa.keyName] != null)
{
field.SetValue(this,
Convert.ChangeType(siteCookie[ppsa.keyName],
field.FieldType,
CultureInfo.InvariantCulture));
}
}
}
}
// Session scope values
foreach (FieldInfo field in fields)
{
if (field.IsDefined(typeof(SessionPageStateAttribute), true) &&
field.FieldType.IsSerializable)
{
SessionPageStateAttribute spsa =
(SessionPageStateAttribute)
field.GetCustomAttributes(
typeof(SessionPageStateAttribute), true)[0];
if (spsa.keyName == null)
{
field.SetValue(this,
Session[Page.Request.Path + ":" + this.UniqueID + "." + field.Name]);
}
else
{
field.SetValue(this,
Session[keyPrefix + spsa.keyName]);
}
}
}
if (IsPostBack)
{
// Conversation scope values
foreach (FieldInfo field in fields)
{
if (field.IsDefined(typeof(TransientPageStateAttribute),
true) &&
field.FieldType.IsSerializable)
{
field.SetValue(this,
Session[Page.Request.Path + ":" + this.UniqueID + "." + field.Name]);
}
}
}
}
