两个粒度看Asp.net生命周期

ction["__VIEWSTATEENCRYPTED"] != null)
 48                 {
 49                     this.ContainsEncryptedViewState = true;
 50                 }
 51                 callbackControlID = this._requestValueCollection["__CALLBACKID"];
 52                 if ((callbackControlID != null) && (this._request.HttpVerb == HttpVerb.POST))
 53                 {
 54                     this._isCallback = true;
 55                 }
 56                 else if (!this.IsCrossPagePostBack)
 57                 {
 58                     VirtualPath path = null;
 59                     if (this._requestValueCollection["__PREVIOUSPAGE"] != null)
 60                     {
 61                         try
 62                         {
 63                             path = VirtualPath.CreateNonRelativeAllowNull(DecryptString(this.        _requestValueCollection["__PREVIOUSPAGE"]));
 64                         }
 65