/// <summary>
/// Returns an object that is used by the Web page to maintain the control and view states.
/// </summary>
/// <returns>
/// An object derived from <see cref="T:System.Web.UI.PageStatePersister"/> that supports creating and extracting the
/// combined control and view states for the <see cref="T:System.Web.UI.Page"/>.
/// </returns>
public override PageStatePersister GetStatePersister()
{
PageViewStateStorageAttribute psa =
Attribute.GetCustomAttribute(this.Page.GetType(), typeof(PageViewStateStorageAttribute), true) as PageViewStateStorageAttribute ??
new PageViewStateStorageAttribute(StateStorageTypes.Default);
PageStatePersister psp;
switch (psa.StorageType)
{
case StateStorageTypes.Session:
psp = new SessionPageStatePersister(this.Page);
break;
case StateStorageTypes.InPage:
psp = new HiddenFieldPageStatePersister(this.Page);
break;
//case StateStorageTypes.Default:
default:
psp = new SessionPageStatePersister(this.Page);
break;
}
return(psp);
}
//
// Summary:
// Deserializes and loads persisted state from the repository when
// a System.Web.UI.Page object initializes its control hierarchy.
//
// Exceptions:
// T:System.Web.HttpException:
// The System.Web.UI.SessionPageStatePersister.Load method could not successfully
// deserialize the state contained in the request to the Web server.
public override void Load()
{
string viewStateKey;
if (UseDefaultViewStateHiddenField)
{
// Get key from __VIEWSTATE hidden field
HiddenFieldPageStatePersister _hiddenFiledPagePersister = new HiddenFieldPageStatePersister(Page);
_hiddenFiledPagePersister.Load();
viewStateKey = _hiddenFiledPagePersister.ViewState as string;
}
else
{
// Get key from custom hidden field
//string viewStateKey = Page.Request.Params[ViewStateHiddenFieldName] as string;
viewStateKey = Page.Request.Form[ViewStateHiddenFieldName] as string;
}
if (!string.IsNullOrEmpty(viewStateKey))
{
ViewStateInfo info = (ViewStateInfo)Repository.GetViewState(viewStateKey);
IStateFormatter formatter = this.StateFormatter;
Pair statePair = (Pair)formatter.Deserialize((string)info.Value);
ViewState = statePair.First;
ControlState = statePair.Second;
// Remove from repository after serve
}
}
/// <summary>
/// Возвращает PageStatePersister в зависимости он настроек ViewState mode в web.config
/// </summary>
/// <returns></returns>
public override PageStatePersister GetStatePersister()
{
PageStatePersister pageStatePersister;
switch (Globals.Settings.ViewState.ViewStateMode)
{
case ViewStateModes.Default:
pageStatePersister = base.GetStatePersister();
break;
case ViewStateModes.InPage:
pageStatePersister = new HiddenFieldPageStatePersister(Page);
break;
case ViewStateModes.InSession:
pageStatePersister = new SessionPageStatePersister(Page);
break;
case ViewStateModes.InMsSql:
pageStatePersister = new StsSqlPageStatePersister(Page);
break;
default:
throw new ArgumentOutOfRangeException();
}
return(pageStatePersister);
}
//
// Summary:
// Serializes any object state contained in the System.Web.UI.PageStatePersister.ViewState
// or the System.Web.UI.PageStatePersister.ControlState property and writes the
// state to the repository.
public override void Save()
{
if (base.ViewState == null && base.ControlState == null)
{
return;
}
IStateFormatter formatter = this.StateFormatter;
Pair statePair = new Pair(ViewState, ControlState);
// Serialize the statePair object to a string.
string serializedState = formatter.Serialize(statePair);
ViewStateInfo info = new ViewStateInfo(serializedState);
string viewStateKey = Page.Request.Form[ViewStateHiddenFieldName] as string;
if (!string.IsNullOrEmpty(viewStateKey))
{
info.Id = viewStateKey;
}
Repository.SaveViewState(info);
if (UseDefaultViewStateHiddenField)
{
// Save key in __VIEWSTATE hidden field
HiddenFieldPageStatePersister _hiddenFiledPagePersister = new HiddenFieldPageStatePersister(Page);
_hiddenFiledPagePersister.ViewState = info.Id;
_hiddenFiledPagePersister.Save();
}
else
{
// Register hidden field to store cache key in
Page.ClientScript.RegisterHiddenField(ViewStateHiddenFieldName, info.Id);
}
}
public ViewStatePersister(Page page, ICache cache, ITraceProvider trace) : base(page)
{
this.cache = cache;
this.trace = trace;
_hiddenFiledPagePersister = new HiddenFieldPageStatePersister(page);
}
