asp.net 动态创建TextBox控件及状态数据如何加载

internal enum ControlState
{
Constructed,
FrameworkInitialized,
ChildrenInitialized,
Initialized,
ViewStateLoaded,
Loaded,
PreRendered
}

internal void LoadViewStateRecursive(object savedState) {
// nothing to do if we have no state
if (savedState == null || flags[disableViewState])
return;

。。。。。。。

_controlState = ControlState.ViewStateLoaded
}

public class TextBox : WebControl, IPostBackDataHandler, IEditableTextControl {
protected override object SaveViewState() {
if (SaveTextViewState == false) {
ViewState.SetItemDirty("Text", false);
}
return base.SaveViewState();
}
private bool SaveTextViewState {
get {
//


// Must be saved when
// 1. There is a registered event handler for SelectedIndexChanged
// 2. Control is not enabled or visible, because the browser's post data will not include this control
// 3. The instance is a derived instance, which might be overriding the OnTextChanged method

if (TextMode == TextBoxMode.Password) {
return false;
}

if ((Events[EventTextChanged] != null) ||
(IsEnabled == false) ||
(Visible == false) ||
(ReadOnly) ||
(this.GetType() != typeof(TextBox))) {
return true;
}

return false;
}
}

}
public class WebControl : Control, IAttributeAccessor {
protected override object SaveViewState() {
Pair myState = null;

// Save values cached out of view state
if (_webControlFlags[disabledDirty]) {
ViewState["Enabled"] = !flags[isWebControlDisabled];
}

if (ControlStyleCreated) {
// the style shares the StateBag of its owner WebControl
// call SaveViewState to let style participate in state management
ControlStyle.SaveViewState();
}

object baseState = base.SaveViewState();
object aState = null;
if (attrState != null) {
aState = attrState.SaveViewState();
}

if (baseState != null || aState != null) {
myState = new Pair(baseState, aState);
}
return myState;
}
}
public class Control : IComponent, IParserAccessor, IUrlResolutionService, IDataBindingsAccessor, IControlBuilderAccessor, IControlDesignerAccessor, IExpressionsAccessor {
protected virtual object SaveViewState() {
// Save values cached out of view state
if (flags[visibleDirty]) {
ViewState["Visible"] = !flags[invisible];
}
if (flags[validateRequestModeDirty]) {
ViewState["ValidateRequestMode"] = (int)ValidateRequestMode;
}
if (_viewState != null)
return _viewState.SaveViewState();

return null;
}
}
public sealed class StateBag : IStateManager, IDictionary {
internal object SaveViewState() {
ArrayList data = null;
if (bag.Count != 0) {
IDictionaryEnumerator e = bag.GetEnumerator();
while (e.MoveNext()) {
StateItem item = (StateItem)(e.Value);
if (item.IsDirty) {
if (data == null) {
data = new ArrayList();
}
#if OBJECTSTATEFORMATTER
data.Add(new IndexedString((string)e.Key));
#else
data.Add(e.Key);
#endif
data.Add(item.Value);
}
}
}

return data;
}
}

if (SaveTextViewState == false) {
ViewState.SetItemDirty("Text", false);
}