我寫了一個控件Inherits TextBox，里面有一個復雜屬性Tip，但每次postback的時候都說加載viewstate失敗，除非我在!postback的情況下給Tip.xxx賦值.

下面我貼出代碼，我已經搞了一天了，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

????????"定義屬性"#region"定義屬性"
????????[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?=?"關閉";
????????????}
????????????base.OnLoad(e);
????????}

????????#endregion
????}
}
Tip屬性類 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()?{?}

????????"屬性"#region"屬性"
????????[Category("Behavior")]
????????[DefaultValue(false)]
????????[Description("是否啟用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,鼠標點擊close才關閉
????????///?</summary>
????????[Category("Behavior")]
????????[DefaultValue(false)]
????????[Description("如果ture,鼠標點擊close才關閉")]
????????[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("關閉")]
????????[Description("Close?Text")]
????????[NotifyParentProperty(true)]
????????public?string?CloseText
????????{
????????????get
????????????{
????????????????return?ViewState["CloseText"]?==?null???"關閉"?:?ViewState["CloseText"].ToString();
????????????}
????????????set
????????????{
????????????????ViewState["CloseText"]?=?value;
????????????}
????????}
????????/**////?<summary>
????????///?字符數
????????///?</summary>
????????[Category("Behavior")]
????????[DefaultValue(0)]
????????[Description("字符數")]
????????[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

????????"重寫的方法"#region"重寫的方法"
????????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);
????????}
????}
}


出現的問題，一定要在!PostBack給Tip.xxx賦值，否則出現viewstate不能正常加載的錯誤提示(如果給JTextBox的Text賦值的話),請問這個是什么原因 ！
bug已經發現，原來System.Web.UI.WebControls.TextBox的SaveViewState()已經是Pair

轉載于:https://www.cnblogs.com/genson/archive/2008/02/03/1063463.html

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