Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / UI / ViewStateException.cs / 2 / ViewStateException.cs
namespace System.Web.UI { using System; using System.Runtime.Serialization; using System.Web; using System.Web.Util; using System.Globalization; using System.Security.Permissions; [Serializable] [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] public sealed class ViewStateException : Exception, ISerializable { // not in System.Web.txt because it should not be localized private const string _format = "\r\n\tClient IP: {0}\r\n\tPort: {1}\r\n\tUser-Agent: {2}\r\n\tViewState: {3}\r\n\tReferer: {4}\r\n\tPath: {5}"; private bool _isConnected = true; private string _remoteAddr; private string _remotePort; private string _userAgent; private string _persistedState; private string _referer; private string _path; private string _message; internal bool _macValidationError; public override string Message { get { return _message; } } public string RemoteAddress { get { return _remoteAddr; } } public string RemotePort { get { return _remotePort; } } public string UserAgent { get { return _userAgent; } } public string PersistedState { get { return _persistedState; } } public string Referer { get { return _referer; } } public string Path { get { return _path; } } public bool IsConnected { get { return _isConnected; } } private ViewStateException(SerializationInfo info, StreamingContext context) :base(info, context) { } // Create by calling appropriate Throw*Error method, which wraps the error // in an HttpException that displays a meaningful message at the top of the page. public ViewStateException() {} private ViewStateException(string message) {} private ViewStateException(string message, Exception e) {} private ViewStateException(Exception innerException, string persistedState): base(null, innerException) { Initialize(persistedState); } private void Initialize(string persistedState) { _persistedState = persistedState; HttpContext context = HttpContext.Current; HttpRequest request = context != null ? context.Request : null; HttpResponse response = context != null ? context.Response : null; // Return the generic viewstate error if the request does not have permission to ServerVariables if (request == null || response == null || !HttpRuntime.HasAspNetHostingPermission(AspNetHostingPermissionLevel.Low)) { _message = ShortMessage; return; } _isConnected = response.IsClientConnected; _remoteAddr = request.ServerVariables["REMOTE_ADDR"]; _remotePort = request.ServerVariables["REMOTE_PORT"]; _userAgent = request.ServerVariables["HTTP_USER_AGENT"]; _referer = request.ServerVariables["HTTP_REFERER"]; _path = request.ServerVariables["PATH_INFO"]; string debugInfo = String.Format(CultureInfo.InvariantCulture, _format, _remoteAddr, _remotePort, _userAgent, _persistedState, _referer, _path); _message = SR.GetString(SR.ViewState_InvalidViewStatePlus, debugInfo); } [SecurityPermissionAttribute(SecurityAction.Demand, SerializationFormatter=true)] public override void GetObjectData(SerializationInfo info, StreamingContext context) { base.GetObjectData(info, context); } internal string ShortMessage { get { return SR.ViewState_InvalidViewState; } } // if the client disconnected, we want to display that at the top of the error page private static string GetCorrectErrorPageMessage(ViewStateException vse, string message) { if (!vse.IsConnected) return SR.GetString(SR.ViewState_ClientDisconnected); else return SR.GetString(message); } private static void ThrowError(Exception inner, string persistedState, string errorPageMessage, bool macValidationError) { ViewStateException middle; HttpException outer; middle = new ViewStateException(inner, persistedState); middle._macValidationError = macValidationError; // Setup the formatter for this exception, to make sure this message shows up // in an error page as opposed to the inner-most exception's message. outer = new HttpException(GetCorrectErrorPageMessage(middle, errorPageMessage), middle); outer.SetFormatter(new UseLastUnhandledErrorFormatter(outer)); throw outer; } internal static void ThrowMacValidationError(Exception inner, string persistedState) { ThrowError(inner, persistedState, SR.ViewState_AuthenticationFailed, true); } internal static void ThrowViewStateError(Exception inner, string persistedState) { ThrowError(inner, persistedState, SR.Invalid_ControlState, false); } } }
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