//
// System.Web.UI.Page.cs
//
// Authors:
// Duncan Mak (duncan@ximian.com)
// Gonzalo Paniagua (gonzalo@ximian.com)
// Andreas Nahr (ClassDevelopment@A-SoftTech.com)
//
// (C) 2002,2003 Ximian, Inc. (http://www.ximian.com)
// (c) 2003 Novell, Inc. (http://www.novell.com)
//
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using System.Collections;
using System.Collections.Specialized;
using System.ComponentModel;
using System.ComponentModel.Design;
using System.ComponentModel.Design.Serialization;
using System.Globalization;
using System.IO;
using System.Security.Principal;
using System.Text;
using System.Threading;
using System.Web;
using System.Web.Caching;
using System.Web.SessionState;
using System.Web.Util;
namespace System.Web.UI
{
[DefaultEvent ("Load"), DesignerCategory ("ASPXCodeBehind")]
[ToolboxItem (false)]
[Designer ("System.Web.UI.Design.ControlDesigner, " + Consts.AssemblySystem_Design, typeof (IDesigner))]
[RootDesignerSerializer ("Microsoft.VSDesigner.WebForms.RootCodeDomSerializer, " + Consts.AssemblyMicrosoft_VSDesigner, "System.ComponentModel.Design.Serialization.CodeDomSerializer, " + Consts.AssemblySystem_Design, true)]
public class Page : TemplateControl, IHttpHandler
{
private bool _viewState = true;
private bool _viewStateMac;
private string _errorPage;
private bool _isValid;
private bool _smartNavigation;
private int _transactionMode;
private HttpContext _context;
private ValidatorCollection _validators;
private bool renderingForm;
private object _savedViewState;
private ArrayList _requiresPostBack;
private ArrayList _requiresPostBackCopy;
private ArrayList requiresPostDataChanged;
private IPostBackEventHandler requiresRaiseEvent;
private NameValueCollection secondPostData;
private bool requiresPostBackScript;
private bool postBackScriptRendered;
private Hashtable registeredArrayDeclares;
Hashtable clientScriptBlocks;
Hashtable startupScriptBlocks;
Hashtable hiddenFields;
internal Hashtable submitStatements;
bool handleViewState;
string viewStateUserKey;
NameValueCollection _requestValueCollection;
string clientTarget;
[EditorBrowsable (EditorBrowsableState.Never)]
protected const string postEventArgumentID = "__EVENTARGUMENT";
[EditorBrowsable (EditorBrowsableState.Never)]
protected const string postEventSourceID = "__EVENTTARGET";
#region Constructor
public Page ()
{
Page = this;
}
#endregion
#region Properties
[DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
[Browsable (false)]
public HttpApplicationState Application
{
get { return _context.Application; }
}
[EditorBrowsable (EditorBrowsableState.Never)]
protected bool AspCompatMode
{
set { throw new NotImplementedException (); }
}
[EditorBrowsable (EditorBrowsableState.Never)]
protected bool Buffer
{
set { Response.BufferOutput = value; }
}
[DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
[Browsable (false)]
public Cache Cache
{
get { return _context.Cache; }
}
[DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
[Browsable (false), DefaultValue ("")]
[WebSysDescription ("Value do override the automatic browser detection and force the page to use the specified browser.")]
public string ClientTarget
{
get { return (clientTarget == null) ? "" : clientTarget; }
set {
clientTarget = value;
if (value == "")
clientTarget = null;
}
}
[EditorBrowsable (EditorBrowsableState.Never)]
protected int CodePage
{
set { Response.ContentEncoding = Encoding.GetEncoding (value); }
}
[EditorBrowsable (EditorBrowsableState.Never)]
protected string ContentType
{
set { Response.ContentType = value; }
}
protected override HttpContext Context
{
get {
if (_context == null)
return HttpContext.Current;
return _context;
}
}
[EditorBrowsable (EditorBrowsableState.Never)]
protected string Culture
{
set { Thread.CurrentThread.CurrentCulture = new CultureInfo (value); }
}
[Browsable (false)]
public override bool EnableViewState
{
get { return _viewState; }
set { _viewState = value; }
}
[EditorBrowsable (EditorBrowsableState.Never)]
protected bool EnableViewStateMac
{
get { return _viewStateMac; }
set { _viewStateMac = value; }
}
[DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
[Browsable (false), DefaultValue ("")]
[WebSysDescription ("The URL of a page used for error redirection.")]
public string ErrorPage
{
get { return _errorPage; }
set {
_errorPage = value;
if (_context != null)
_context.ErrorPage = value;
}
}
[EditorBrowsable (EditorBrowsableState.Never)]
protected ArrayList FileDependencies
{
set {
if (Response != null)
Response.AddFileDependencies (value);
}
}
[Browsable (false)]
public override string ID
{
get { return base.ID; }
set { base.ID = value; }
}
[DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
[Browsable (false)]
public bool IsPostBack
{
get {
return _requestValueCollection != null;
}
}
[EditorBrowsable (EditorBrowsableState.Never), Browsable (false)]
public bool IsReusable {
get { return false; }
}
[DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
[Browsable (false)]
public bool IsValid
{
get { return _isValid; }
}
[EditorBrowsable (EditorBrowsableState.Never)]
protected int LCID {
set { Thread.CurrentThread.CurrentCulture = new CultureInfo (value); }
}
[DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
[Browsable (false)]
public HttpRequest Request
{
get { return _context.Request; }
}
[DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
[Browsable (false)]
public HttpResponse Response
{
get { return _context.Response; }
}
[EditorBrowsable (EditorBrowsableState.Never)]
protected string ResponseEncoding
{
set { Response.ContentEncoding = Encoding.GetEncoding (value); }
}
[DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
[Browsable (false)]
public HttpServerUtility Server
{
get {
return Context.Server;
}
}
[DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
[Browsable (false)]
public virtual HttpSessionState Session
{
get {
if (_context.Session == null)
throw new HttpException ("Session state can only be used " +
"when enableSessionState is set to true, either " +
"in a configuration file or in the Page directive.");
return _context.Session;
}
}
[Browsable (false)]
public bool SmartNavigation
{
get { return _smartNavigation; }
set { _smartNavigation = value; }
}
[DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
[Browsable (false)]
public TraceContext Trace
{
get { return Context.Trace; }
}
[EditorBrowsable (EditorBrowsableState.Never)]
protected bool TraceEnabled
{
set { Trace.IsEnabled = value; }
}
[EditorBrowsable (EditorBrowsableState.Never)]
protected TraceMode TraceModeValue
{
set { Trace.TraceMode = value; }
}
[EditorBrowsable (EditorBrowsableState.Never)]
protected int TransactionMode
{
set { _transactionMode = value; }
}
[EditorBrowsable (EditorBrowsableState.Never)]
protected string UICulture
{
set { Thread.CurrentThread.CurrentUICulture = new CultureInfo (value); }
}
[DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
[Browsable (false)]
public IPrincipal User
{
get { return _context.User; }
}
[DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
[Browsable (false)]
public ValidatorCollection Validators
{
get {
if (_validators == null)
_validators = new ValidatorCollection ();
return _validators;
}
}
[MonoTODO ("Use this when encrypting/decrypting ViewState")]
[Browsable (false)]
public string ViewStateUserKey {
get { return viewStateUserKey; }
set { viewStateUserKey = value; }
}
[Browsable (false)]
public override bool Visible
{
get { return base.Visible; }
set { base.Visible = value; }
}
#endregion
#region Methods
[EditorBrowsable (EditorBrowsableState.Never)]
protected IAsyncResult AspCompatBeginProcessRequest (HttpContext context,
AsyncCallback cb,
object extraData)
{
throw new NotImplementedException ();
}
[EditorBrowsable (EditorBrowsableState.Never)]
protected void AspCompatEndProcessRequest (IAsyncResult result)
{
throw new NotImplementedException ();
}
[EditorBrowsable (EditorBrowsableState.Advanced)]
protected virtual HtmlTextWriter CreateHtmlTextWriter (TextWriter tw)
{
return new HtmlTextWriter (tw);
}
[EditorBrowsable (EditorBrowsableState.Never)]
public void DesignerInitialize ()
{
InitRecursive (null);
}
[EditorBrowsable (EditorBrowsableState.Advanced)]
protected virtual NameValueCollection DeterminePostBackMode ()
{
if (_context == null)
return null;
HttpRequest req = _context.Request;
if (req == null)
return null;
NameValueCollection coll = null;
if (0 == String.Compare (Request.HttpMethod, "POST", true))
coll = req.Form;
else
coll = req.QueryString;
if (coll == null || coll ["__VIEWSTATE"] == null)
return null;
return coll;
}
[EditorBrowsable (EditorBrowsableState.Advanced)]
public string GetPostBackClientEvent (Control control, string argument)
{
return GetPostBackEventReference (control, argument);
}
[EditorBrowsable (EditorBrowsableState.Advanced)]
public string GetPostBackClientHyperlink (Control control, string argument)
{
return "javascript:" + GetPostBackEventReference (control, argument);
}
[EditorBrowsable (EditorBrowsableState.Advanced)]
public string GetPostBackEventReference (Control control)
{
return GetPostBackEventReference (control, "");
}
[EditorBrowsable (EditorBrowsableState.Advanced)]
public string GetPostBackEventReference (Control control, string argument)
{
RequiresPostBackScript ();
return String.Format ("__doPostBack('{0}','{1}')", control.UniqueID, argument);
}
internal void RequiresPostBackScript ()
{
requiresPostBackScript = true;
}
[EditorBrowsable (EditorBrowsableState.Never)]
public virtual int GetTypeHashCode ()
{
return 0;
}
[EditorBrowsable (EditorBrowsableState.Never)]
protected virtual void InitOutputCache (int duration,
string varyByHeader,
string varyByCustom,
OutputCacheLocation location,
string varyByParam)
{
HttpCachePolicy cache = _context.Response.Cache;
bool set_vary = false;
switch (location) {
case OutputCacheLocation.Any:
cache.SetCacheability (HttpCacheability.Public);
cache.SetMaxAge (new TimeSpan (0, 0, duration));
cache.SetLastModified (_context.Timestamp);
set_vary = true;
break;
case OutputCacheLocation.Client:
cache.SetCacheability (HttpCacheability.Private);
cache.SetMaxAge (new TimeSpan (0, 0, duration));
cache.SetLastModified (_context.Timestamp);
break;
case OutputCacheLocation.Downstream:
cache.SetCacheability (HttpCacheability.Public);
cache.SetMaxAge (new TimeSpan (0, 0, duration));
cache.SetLastModified (_context.Timestamp);
break;
case OutputCacheLocation.Server:
cache.SetCacheability (HttpCacheability.Server);
set_vary = true;
break;
case OutputCacheLocation.None:
break;
}
if (set_vary) {
if (varyByCustom != null)
cache.SetVaryByCustom (varyByCustom);
if (varyByParam != null && varyByParam.Length > 0) {
string[] prms = varyByParam.Split (';');
foreach (string p in prms)
cache.VaryByParams [p.Trim ()] = true;
cache.VaryByParams.IgnoreParams = false;
} else {
cache.VaryByParams.IgnoreParams = true;
}
if (varyByHeader != null && varyByHeader.Length > 0) {
string[] hdrs = varyByHeader.Split (';');
foreach (string h in hdrs)
cache.VaryByHeaders [h.Trim ()] = true;
}
}
cache.Duration = duration;
cache.SetExpires (_context.Timestamp.AddSeconds (duration));
}
[EditorBrowsable (EditorBrowsableState.Advanced)]
public bool IsClientScriptBlockRegistered (string key)
{
if (clientScriptBlocks == null)
return false;
return clientScriptBlocks.ContainsKey (key);
}
[EditorBrowsable (EditorBrowsableState.Advanced)]
public bool IsStartupScriptRegistered (string key)
{
if (startupScriptBlocks == null)
return false;
return startupScriptBlocks.ContainsKey (key);
}
public string MapPath (string virtualPath)
{
return Request.MapPath (virtualPath);
}
private void RenderPostBackScript (HtmlTextWriter writer, string formUniqueID)
{
writer.WriteLine ("", postEventSourceID);
writer.WriteLine ("", postEventArgumentID);
writer.WriteLine ();
writer.WriteLine ("");
}
static void WriteScripts (HtmlTextWriter writer, Hashtable scripts)
{
if (scripts == null)
return;
foreach (string key in scripts.Values)
writer.WriteLine (key);
}
void WriteHiddenFields (HtmlTextWriter writer)
{
if (hiddenFields == null)
return;
foreach (string key in hiddenFields.Keys) {
string value = hiddenFields [key] as string;
writer.WriteLine ("\n", key, value);
}
hiddenFields = null;
}
internal void OnFormRender (HtmlTextWriter writer, string formUniqueID)
{
if (renderingForm)
throw new HttpException ("Only 1 HtmlForm is allowed per page.");
renderingForm = true;
writer.WriteLine ();
WriteHiddenFields (writer);
if (requiresPostBackScript) {
RenderPostBackScript (writer, formUniqueID);
postBackScriptRendered = true;
}
if (handleViewState) {
string vs = GetViewStateString ();
writer.Write ("", vs);
}
WriteScripts (writer, clientScriptBlocks);
}
internal string GetViewStateString ()
{
StringWriter sr = new StringWriter ();
LosFormatter fmt = new LosFormatter ();
fmt.Serialize (sr, _savedViewState);
return sr.GetStringBuilder ().ToString ();
}
internal void OnFormPostRender (HtmlTextWriter writer, string formUniqueID)
{
if (registeredArrayDeclares != null) {
writer.WriteLine();
writer.WriteLine("");
writer.WriteLine();
}
if (!postBackScriptRendered && requiresPostBackScript)
RenderPostBackScript (writer, formUniqueID);
WriteHiddenFields (writer);
WriteScripts (writer, startupScriptBlocks);
renderingForm = false;
postBackScriptRendered = false;
}
private void ProcessPostData (NameValueCollection data, bool second)
{
if (data == null)
return;
if (_requiresPostBackCopy == null && _requiresPostBack != null)
_requiresPostBackCopy = (ArrayList) _requiresPostBack.Clone ();
Hashtable used = new Hashtable ();
foreach (string id in data.AllKeys){
if (id == "__VIEWSTATE" || id == postEventSourceID || id == postEventArgumentID)
continue;
string real_id = id;
int dot = real_id.IndexOf ('.');
if (dot >= 1)
real_id = real_id.Substring (0, dot);
if (real_id == null || used.ContainsKey (real_id))
continue;
used.Add (real_id, real_id);
Control ctrl = FindControl (real_id);
if (ctrl != null){
IPostBackDataHandler pbdh = ctrl as IPostBackDataHandler;
IPostBackEventHandler pbeh = ctrl as IPostBackEventHandler;
if (pbdh == null) {
if (pbeh != null)
RegisterRequiresRaiseEvent (pbeh);
continue;
}
if (pbdh.LoadPostData (real_id, data) == true) {
if (requiresPostDataChanged == null)
requiresPostDataChanged = new ArrayList ();
requiresPostDataChanged.Add (pbdh);
if (_requiresPostBackCopy != null)
_requiresPostBackCopy.Remove (ctrl.UniqueID);
}
} else if (!second) {
if (secondPostData == null)
secondPostData = new NameValueCollection ();
secondPostData.Add (real_id, data [id]);
}
}
ArrayList list1 = null;
if (_requiresPostBackCopy != null && _requiresPostBackCopy.Count > 0) {
string [] handlers = (string []) _requiresPostBackCopy.ToArray (typeof (string));
foreach (string id in handlers) {
IPostBackDataHandler pbdh = FindControl (id) as IPostBackDataHandler;
if (pbdh != null) {
_requiresPostBackCopy.Remove (id);
if (pbdh.LoadPostData (id, data)) {
if (requiresPostDataChanged == null)
requiresPostDataChanged = new ArrayList ();
requiresPostDataChanged.Add (pbdh);
}
} else if (second) {
if (list1 == null)
list1 = new ArrayList ();
list1.Add (id);
}
}
_requiresPostBack = list1;
}
}
[EditorBrowsable (EditorBrowsableState.Never)]
public void ProcessRequest (HttpContext context)
{
_context = context;
if (clientTarget != null)
Request.ClientTarget = clientTarget;
WireupAutomaticEvents ();
//-- Control execution lifecycle in the docs
// Save culture information because it can be modified in FrameworkInitialize()
CultureInfo culture = Thread.CurrentThread.CurrentCulture;
CultureInfo uiculture = Thread.CurrentThread.CurrentUICulture;
FrameworkInitialize ();
context.ErrorPage = _errorPage;
try {
InternalProcessRequest ();
} finally {
try {
UnloadRecursive (true);
} catch {}
Thread.CurrentThread.CurrentCulture = culture;
Thread.CurrentThread.CurrentUICulture = uiculture;
}
}
void InternalProcessRequest ()
{
_requestValueCollection = this.DeterminePostBackMode();
Trace.Write ("aspx.page", "Begin Init");
InitRecursive (null);
Trace.Write ("aspx.page", "End Init");
renderingForm = false;
if (IsPostBack) {
Trace.Write ("aspx.page", "Begin LoadViewState");
LoadPageViewState ();
Trace.Write ("aspx.page", "End LoadViewState");
Trace.Write ("aspx.page", "Begin ProcessPostData");
ProcessPostData (_requestValueCollection, false);
Trace.Write ("aspx.page", "End ProcessPostData");
}
LoadRecursive ();
if (IsPostBack) {
Trace.Write ("aspx.page", "Begin ProcessPostData Second Try");
ProcessPostData (secondPostData, true);
Trace.Write ("aspx.page", "End ProcessPostData Second Try");
Trace.Write ("aspx.page", "Begin Raise ChangedEvents");
RaiseChangedEvents ();
Trace.Write ("aspx.page", "End Raise ChangedEvents");
Trace.Write ("aspx.page", "Begin Raise PostBackEvent");
RaisePostBackEvents ();
Trace.Write ("aspx.page", "End Raise PostBackEvent");
}
Trace.Write ("aspx.page", "Begin PreRender");
PreRenderRecursiveInternal ();
Trace.Write ("aspx.page", "End PreRender");
Trace.Write ("aspx.page", "Begin SaveViewState");
SavePageViewState ();
Trace.Write ("aspx.page", "End SaveViewState");
//--
Trace.Write ("aspx.page", "Begin Render");
HtmlTextWriter output = new HtmlTextWriter (_context.Response.Output);
RenderControl (output);
Trace.Write ("aspx.page", "End Render");
RenderTrace (output);
}
private void RenderTrace (HtmlTextWriter output)
{
TraceManager traceManager = HttpRuntime.TraceManager;
if (Trace.HaveTrace && !Trace.IsEnabled || !Trace.HaveTrace && !traceManager.Enabled)
return;
Trace.SaveData ();
if (!Trace.HaveTrace && traceManager.Enabled && !traceManager.PageOutput)
return;
if (!traceManager.LocalOnly || Context.Request.IsLocal)
Trace.Render (output);
}
internal void RaisePostBackEvents ()
{
if (requiresRaiseEvent != null) {
RaisePostBackEvent (requiresRaiseEvent, null);
return;
}
NameValueCollection postdata = _requestValueCollection;
if (postdata == null)
return;
string eventTarget = postdata [postEventSourceID];
if (eventTarget == null || eventTarget.Length == 0) {
Validate ();
return;
}
IPostBackEventHandler target = FindControl (eventTarget) as IPostBackEventHandler;
if (target == null)
return;
string eventArgument = postdata [postEventArgumentID];
RaisePostBackEvent (target, eventArgument);
}
internal void RaiseChangedEvents ()
{
if (requiresPostDataChanged == null)
return;
foreach (IPostBackDataHandler ipdh in requiresPostDataChanged)
ipdh.RaisePostDataChangedEvent ();
requiresPostDataChanged = null;
}
[EditorBrowsable (EditorBrowsableState.Advanced)]
protected virtual void RaisePostBackEvent (IPostBackEventHandler sourceControl, string eventArgument)
{
sourceControl.RaisePostBackEvent (eventArgument);
}
[EditorBrowsable (EditorBrowsableState.Advanced)]
public void RegisterArrayDeclaration (string arrayName, string arrayValue)
{
if (registeredArrayDeclares == null)
registeredArrayDeclares = new Hashtable();
if (!registeredArrayDeclares.ContainsKey (arrayName))
registeredArrayDeclares.Add (arrayName, new ArrayList());
((ArrayList) registeredArrayDeclares[arrayName]).Add(arrayValue);
}
[EditorBrowsable (EditorBrowsableState.Advanced)]
public virtual void RegisterClientScriptBlock (string key, string script)
{
if (IsClientScriptBlockRegistered (key))
return;
if (clientScriptBlocks == null)
clientScriptBlocks = new Hashtable ();
clientScriptBlocks.Add (key, script);
}
[EditorBrowsable (EditorBrowsableState.Advanced)]
public virtual void RegisterHiddenField (string hiddenFieldName, string hiddenFieldInitialValue)
{
if (hiddenFields == null)
hiddenFields = new Hashtable ();
if (!hiddenFields.ContainsKey (hiddenFieldName))
hiddenFields.Add (hiddenFieldName, hiddenFieldInitialValue);
}
[MonoTODO("Used in HtmlForm")]
internal void RegisterClientScriptFile (string a, string b, string c)
{
throw new NotImplementedException ();
}
[EditorBrowsable (EditorBrowsableState.Advanced)]
public void RegisterOnSubmitStatement (string key, string script)
{
if (submitStatements == null)
submitStatements = new Hashtable ();
if (submitStatements.ContainsKey (key))
return;
submitStatements.Add (key, script);
}
[EditorBrowsable (EditorBrowsableState.Advanced)]
public void RegisterRequiresPostBack (Control control)
{
if (_requiresPostBack == null)
_requiresPostBack = new ArrayList ();
_requiresPostBack.Add (control.UniqueID);
}
[EditorBrowsable (EditorBrowsableState.Advanced)]
public virtual void RegisterRequiresRaiseEvent (IPostBackEventHandler control)
{
requiresRaiseEvent = control;
}
[EditorBrowsable (EditorBrowsableState.Advanced)]
public virtual void RegisterStartupScript (string key, string script)
{
if (IsStartupScriptRegistered (key))
return;
if (startupScriptBlocks == null)
startupScriptBlocks = new Hashtable ();
startupScriptBlocks.Add (key, script);
}
[EditorBrowsable (EditorBrowsableState.Advanced)]
public void RegisterViewStateHandler ()
{
handleViewState = true;
}
[EditorBrowsable (EditorBrowsableState.Advanced)]
protected virtual void SavePageStateToPersistenceMedium (object viewState)
{
_savedViewState = viewState;
}
[EditorBrowsable (EditorBrowsableState.Advanced)]
protected virtual object LoadPageStateFromPersistenceMedium ()
{
NameValueCollection postdata = _requestValueCollection;
string view_state;
if (postdata == null || (view_state = postdata ["__VIEWSTATE"]) == null)
return null;
_savedViewState = null;
LosFormatter fmt = new LosFormatter ();
try {
_savedViewState = fmt.Deserialize (view_state);
} catch (Exception e) {
throw new HttpException ("Error restoring page viewstate.\n", e);
}
return _savedViewState;
}
internal void LoadPageViewState()
{
object sState = LoadPageStateFromPersistenceMedium ();
if (sState != null) {
Pair pair = (Pair) sState;
LoadViewStateRecursive (pair.First);
_requiresPostBack = pair.Second as ArrayList;
}
}
internal void SavePageViewState ()
{
if (!handleViewState)
return;
Pair pair = new Pair ();
pair.First = SaveViewStateRecursive ();
if (_requiresPostBack != null && _requiresPostBack.Count > 0)
pair.Second = _requiresPostBack;
if (pair.First == null && pair.Second == null)
pair = null;
SavePageStateToPersistenceMedium (pair);
}
public virtual void Validate ()
{
if (_validators == null || _validators.Count == 0){
_isValid = true;
return;
}
bool all_valid = true;
foreach (IValidator v in _validators){
v.Validate ();
if (v.IsValid == false)
all_valid = false;
}
if (all_valid)
_isValid = true;
}
[EditorBrowsable (EditorBrowsableState.Advanced)]
public virtual void VerifyRenderingInServerForm (Control control)
{
if (!renderingForm)
throw new HttpException ("Control '" + control.ClientID + " " + control.GetType () +
"' must be rendered within a HtmlForm");
}
#endregion
#if NET_2_0
public string GetWebResourceUrl(Type type, string resourceName)
{
if (type == null)
throw new ArgumentNullException ("type");
if (resourceName == null || resourceName.Length == 0)
throw new ArgumentNullException ("type");
return System.Web.Handlers.AssemblyResourceLoader.GetResourceUrl (type, resourceName);
}
Stack dataItemCtx;
internal void PushDataItemContext (object o)
{
if (dataItemCtx == null)
dataItemCtx = new Stack ();
dataItemCtx.Push (o);
}
internal void PopDataItemContext ()
{
if (dataItemCtx == null)
throw new InvalidOperationException ();
dataItemCtx.Pop ();
}
internal object CurrentDataItem {
get {
if (dataItemCtx == null)
throw new InvalidOperationException ("No data item");
return dataItemCtx.Peek ();
}
}
protected object Eval (string expression)
{
return DataBinder.Eval (CurrentDataItem, expression);
}
protected object Eval (string expression, string format)
{
return DataBinder.Eval (CurrentDataItem, expression, format);
}
protected object XPath (string xpathexpression)
{
return XPathBinder.Eval (CurrentDataItem, xpathexpression);
}
protected object XPath (string xpathexpression, string format)
{
return XPathBinder.Eval (CurrentDataItem, xpathexpression, format);
}
protected IEnumerable XPathSelect (string xpathexpression)
{
return XPathBinder.Select (CurrentDataItem, xpathexpression);
}
#endif
}
}