我写了一个控件Inherits TextBox，里面有一个复杂属性Tip，但每次postback的时候都说加载viewstate失败，除非我在!postback的情况下给Tip.xxx赋值.
下面我贴出代码，我已经搞了一天了，搞不出什么原因。
JTextBox控件
using System;using System.Collections.Generic;using System.ComponentModel;using System.Text;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;namespace Madou.WebControls
{
[DefaultProperty("Text")] [ParseChildren(true), PersistChildren(false)] [ToolboxData("<{0}:JTextBox runat=server></{0}:JTextBox>")] public class JTextBox : System.Web.UI.WebControls.TextBox
{ public JTextBox() { BackColor = System.Drawing.Color.Beige; 
} "Private"#region"Private" private ClipTipComponent _tip; #endregion "定义属性"#region"定义属性" [Bindable(true)] [Category("Behavior")] [Description("Tip")] [DesignerSerializationVisibility(DesignerSerializationVisibility.Content)] [PersistenceMode(PersistenceMode.InnerProperty)] [NotifyParentProperty(true)] public virtual ClipTipComponent Tip { get { if (_tip == null) { _tip = new ClipTipComponent(); if (IsTrackingViewState) { ((IStateManager)_tip).TrackViewState(); } } return _tip; } } #endregion "override"#region"override" state management#region state management protected override void LoadViewState(object savedState) { Pair p = savedState as Pair; //HttpContext.Current.Response.Write(savedState.GetType().ToString()); // HttpContext.Current.Response.Write(savedState==null); // HttpContext.Current.Response.End(); if (p != null) { base.LoadViewState(p.First); ((IStateManager)Tip).LoadViewState(p.Second); } else { base.LoadViewState(savedState); } } protected override object SaveViewState() { object baseState = base.SaveViewState(); object thisState = null; if (Tip != null) { thisState = ((IStateManager)Tip).SaveViewState(); } if (thisState != null) { return new Pair(baseState, thisState); } else { return baseState; } } protected override void TrackViewState() { if (_tip != null) { ((IStateManager)_tip).TrackViewState(); } base.TrackViewState(); } #endregion protected override void OnPreRender(EventArgs e) { Tip.RegisterJs(this); base.OnPreRender(e); } protected override void OnLoad(EventArgs e) { if (!Page.IsPostBack) { Tip.CloseText = "关闭"; } base.OnLoad(e); } #endregion }
}using System;using System.Collections.Generic;using System.ComponentModel;using System.Text;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;using Madou.WebControls.Converter;namespace Madou.WebControls{ [TypeConverter(typeof(ClipTipComponentConverter))] public class ClipTipComponent : IStateManager { "Private"#region"Private" private bool _isTrackingViewState; private StateBag _viewState; #endregion public ClipTipComponent() { } "属性"#region"属性" [Category("Behavior")] [DefaultValue(false)] [Description("是否启用Ajax效果")] [NotifyParentProperty(true)] public bool EnabledAjax { get { return ViewState["EnabledAjax"] == null ? false : Convert.ToBoolean(ViewState["EnabledAjax"]); } set { ViewState["EnabledAjax"] = value; } } /**//// <summary> /// 是否使用Tip功能 /// </summary> [Category("Behavior")] [DefaultValue(true)] [Description("是否使用ClipTip功能")] [NotifyParentProperty(true)] public bool EnabledClipTip { get { return ViewState["EnabledClipTip"] == null ? true : Convert.ToBoolean(ViewState["EnabledClipTip"]); } set { ViewState["EnabledClipTip"] = value; } } /**//// <summary> /// // The width of the clueTip /// </summary> [Category("Behavior")] [DefaultValue("275")] [Description("The width of the clueTip")] [NotifyParentProperty(true)] public string TipWidth { get { return ViewState["TipWidth"] == null ? "275" : ViewState["TipWidth"].ToString(); } set { ViewState["TipWidth"] = value; } } /**//// <summary> /// // The height of the clueTip. /// </summary> [Category("Behavior")] [DefaultValue("auto")] [Description("The height of the clueTip")] [NotifyParentProperty(true)] public string TipHeigth { get { return ViewState["TipHeigth"] == null ? "auto" : ViewState["TipHeigth"].ToString(); } set { ViewState["TipHeigth"] = value; } } /**//// <summary> /// A character used to split the title attribute into the clueTip title and divs /// </summary> [Category("Behavior")] [DefaultValue("")] [Description("A character used to split the title attribute into the clueTip title and divs")] [NotifyParentProperty(true)] public string SplitTitle { get { return ViewState["SplitTitle"] == null ? string.Empty : Convert.ToString(ViewState["SplitTitle"]); } set { ViewState["SplitTitle"] = value; } } /**//// <summary> /// show title bar of the clueTip, even if title attribute not set /// </summary> [Category("Behavior")] [DefaultValue(true)] [Description("show title bar of the clueTip, even if title attribute not set")] [NotifyParentProperty(true)] public bool ShowTitle { get { return ViewState["ShowTitle"] == null ? true : Convert.ToBoolean(ViewState["ShowTitle"]); } set { ViewState["ShowTitle"] = value; } } /**//// <summary> /// his is also used for a "directional" class on the same div, depending on where the clueTip is in relation to the invoking element. The class appears in the form of 'cluetip-' + direction + cluetipClass. this allows you to create your own clueTip theme in a separate CSS file or use one of the three pre-packaged themes: default, jtip, or rounded. /// </summary> [Category("Behavior")] [DefaultValue("default")] [Description("default, jtip, or rounded")] [NotifyParentProperty(true)] [Bindable(false)] [TypeConverter(typeof(Madou.WebControls.Converter.ClueTipClassConverter))] public string ClueTipClass { get { return ViewState["ClueTipClass"] == null ? "default" : Convert.ToString(ViewState["ClueTipClass"]); } set { ViewState["ClueTipClass"] = value; } } /**//// <summary> /// class applied to the invoking element onmouseover and removed onmouseout /// </summary> [Category("Behavior")] [DefaultValue("")] [Description("class applied to the invoking element onmouseover and removed onmouseout")] [NotifyParentProperty(true)] public string HoverClass { get { return ViewState["HoverClass"] == null ? string.Empty : Convert.ToString(ViewState["HoverClass"]); } set { ViewState["HoverClass"] = value; } } /**//// <summary> /// if true, displays arrow on appropriate side of clueTip. more info below [8] /// </summary> [Category("Behavior")] [DefaultValue(false)] [Description("if true, displays arrow on appropriate side of clueTip")] [NotifyParentProperty(true)] public bool Arrows { get { return ViewState["Arrows"] == null ? false : Convert.ToBoolean(ViewState["Arrows"]); } set { ViewState["Arrows"] = value; } } [Category("Behavior")] [DefaultValue(true)] [Description("是否有Shadow")] [NotifyParentProperty(true)] public bool DropShadow { get { return ViewState["DropShadow"] == null ? true : Convert.ToBoolean(ViewState["DropShadow"]); } set { ViewState["DropShadow"] = value; } } [Category("Behavior")] [DefaultValue(6)] [Description("Shadow Steps")] [NotifyParentProperty(true)] public int DropShadowSteps { get { return ViewState["DropShadowSteps"] == null ? 6 : Convert.ToInt32(ViewState["DropShadowSteps"]); } set { ViewState["DropShadowSteps"] = value; } } /**//// <summary> /// 如果ture,鼠标点击close才关闭 /// </summary> [Category("Behavior")] [DefaultValue(false)] [Description("如果ture,鼠标点击close才关闭")] [NotifyParentProperty(true)] public bool Sticky { get { return ViewState["Sticky"] == null ? false : Convert.ToBoolean(ViewState["Sticky"]); } set { ViewState["Sticky"] = value; } } /**//// <summary> /// close when clueTip is moused out /// </summary> [Category("Behavior")] [DefaultValue(false)] [Description("close when clueTip is moused out")] [NotifyParentProperty(true)] public bool MouseOutClose { get { return ViewState["MouseOutClose"] == null ? false : Convert.ToBoolean(ViewState["MouseOutClose"]); } set { ViewState["MouseOutClose"] = value; } } /**//// <summary> /// 'hover'OR 'click', // set to 'click' to force user to click to show clueTip /// </summary> [Category("Behavior")] [DefaultValue("hover")] [Description("hover'OR 'click'")] [NotifyParentProperty(true)] [TypeConverter(typeof(Madou.WebControls.Converter.ActivationConverter))] public string Activation { get { return ViewState["Activation"] == null ? "hover" : ViewState["Activation"].ToString(); } set { ViewState["Activation"] = value; } } /**//// <summary> /// if true, and activation is not 'click', then clicking on a clueTipped link will take user to /// the link's href, even if href and tipAttribute are equal /// </summary> [Category("Behavior")] [DefaultValue(false)] [Description("if true, and activation is not 'click'")] [NotifyParentProperty(true)] public bool ClickThrough { get { return ViewState["ClickThrough"] == null ? false : Convert.ToBoolean(ViewState["ClickThrough"]); } set { ViewState["ClickThrough"] = value; } } /**//// <summary> /// // if true, clueTip will track mouse movement (experimental) /// </summary> [Category("Behavior")] [DefaultValue(false)] [Description("if true, clueTip will track mouse movement (experimental)")] [NotifyParentProperty(true)] public bool Tracking { get { return ViewState["Tracking"] == null ? false : Convert.ToBoolean(ViewState["Tracking"]); } set { ViewState["Tracking"] = value; } } /**//// <summary> /// close clueTip on a timed delay (experimental) /// </summary> [Category("Behavior")] [DefaultValue(0)] [Description("close clueTip on a timed delay (experimental)")] [NotifyParentProperty(true)] public int DelaydClose { get { return ViewState["DelaydClose"] == null ? 0 : Convert.ToInt32(ViewState["DelaydClose"]); } set { ViewState["DelaydClose"] = value; } } /**//// <summary> /// location of close text for sticky cluetips; can be 'top' or 'bottom' or 'title' /// </summary> [Category("Behavior")] [DefaultValue("top")] [Description("location of close text for sticky cluetips; can be 'top' or 'bottom' or 'title'")] [NotifyParentProperty(true)] [TypeConverter(typeof(Madou.WebControls.Converter.ClosePositionConverter))] public string ClosePosition { get { return ViewState["ClosePosition"] == null ? "top" : ViewState["ClosePosition"].ToString(); } set { ViewState["ClosePosition"] = value; } } [Category("Behavior")] [DefaultValue("关闭")] [Description("Close Text")] [NotifyParentProperty(true)] public string CloseText { get { return ViewState["CloseText"] == null ? "关闭" : ViewState["CloseText"].ToString(); } set { ViewState["CloseText"] = value; } } /**//// <summary> /// 字符数 /// </summary> [Category("Behavior")] [DefaultValue(0)] [Description("字符数")] [NotifyParentProperty(true)] public int Truncate { get { return ViewState["Truncate"] == null ? 0 : Convert.ToInt32(ViewState["Truncate"]); } set { ViewState["Truncate"] = value; } } #endregion "HELP#region"HELP protected virtual StateBag ViewState { get { if (_viewState == null) { _viewState = new StateBag(true); if (_isTrackingViewState) ((IStateManager)_viewState).TrackViewState(); } return _viewState; } } #endregion "重写的方法"#region"重写的方法" public override string ToString() { return ToString(System.Globalization.CultureInfo.InvariantCulture); } public string ToString(System.Globalization.CultureInfo culture) { return TypeDescriptor.GetConverter(GetType()).ConvertToString(null, culture, this); } #endregion IStateManager Members#region IStateManager Members bool IStateManager.IsTrackingViewState { get { return _isTrackingViewState; } } void IStateManager.LoadViewState(object state) { if (state != null) { ((IStateManager)ViewState).LoadViewState(state); } } object IStateManager.SaveViewState() { object savedState = null; if (_viewState != null) { savedState = ((IStateManager)_viewState).SaveViewState(); } else{ // HttpContext.Current.Response.Write("saveState1=false"); } return savedState; } void IStateManager.TrackViewState() { _isTrackingViewState = true; if (_viewState != null) { ((IStateManager)_viewState).TrackViewState(); } } #endregion internal void SetDirty() { _viewState.SetDirty(true); } internal void RegisterJs(Control target, string clientId) { if (target is WebControl) { string tooltip = (target as WebControl).ToolTip; if (string.IsNullOrEmpty(tooltip.Trim())) { if (!EnabledAjax) return; } } if (EnabledClipTip) { JavaScriptWriter w = new JavaScriptWriter(); w.AddLine("$(function()"); w.OpenBlock(); if (!EnabledAjax) { if (string.IsNullOrEmpty(SplitTitle)) SplitTitle = "|"; w.AddLine("$('#" + clientId + "').cluetip({splitTitle: '" + SplitTitle + "'"); } else { w.AddLine("$('#" + clientId + "').cluetip({splitTitle: ''"); } w.AddJSONItem("cluetipClass", ClueTipClass); w.AddJSONItem("hoverClass", HoverClass); w.AddJSONItem("arrows", Arrows); w.AddJSONItem("dropShadow", DropShadow); w.AddJSONItem("dropShadowSteps", DropShadowSteps); w.AddJSONItem("sticky", Sticky); w.AddJSONItem("mouseOutClose", MouseOutClose); w.AddJSONItem("activation", Activation); w.AddJSONItem("clickThrough", ClickThrough); w.AddJSONItem("tracking", Tracking); w.AddJSONItem("delayedClose", DelaydClose); w.AddJSONItem("closePosition", ClosePosition); w.AddJSONItem("width", TipWidth); w.AddJSONItem("height", TipHeigth); w.AddJSONItem("closeText", CloseText); w.AddJSONItem("truncate", Truncate); w.AddLine("});"); w.CloseBlock(); w.AddLine(");"); target.Page.ClientScript.RegisterClientScriptBlock(target.GetType(), clientId, w.ToString(), false); } } internal void RegisterJs(Control target) { string clientId = target.ClientID; RegisterJs(target, clientId); } }}出现的问题，一定要在!PostBack给Tip.xxx赋值，否则出现viewstate不能正常加载的错误提示(如果给JTextBox的Text赋值的话),请问这个是什么原因 ！
bug已经发现，原来System.Web.UI.WebControls.TextBox的SaveViewState()已经是Pair
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