///// <summary>
///// Handles a callback event
///// </summary>
///// <returns></returns>
//[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1024:UsePropertiesWhereAppropriate", Justification = "Method has a side-effect")]
//protected virtual string GetCallbackResult()
//{
// string argument = _callbackArgument;
// _callbackArgument = null;
// return ScriptObjectBuilder.ExecuteCallbackMethod(this, argument);
//}
///// <summary>
///// Raises a callback event
///// </summary>
///// <param name="eventArgument"></param>
//[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1030:UseEventsWhereAppropriate", Justification = "Maintaining consistency with ICallbackEventHandler")]
//protected virtual void RaiseCallbackEvent(string eventArgument)
//{
// _callbackArgument = eventArgument;
//}
//protected virtual void RaisePostBackEvent(string eventArgument)
//{
//}
/// <summary>
/// Restores view-state information from a previous request that was saved with the SaveViewState method.
/// 并在LoadViewState之前缓存ViewState中所有IStateManager类型项
/// 以及在LoadViewState之后从缓存中恢复将ViewState中ViewSateItemInternal类型项恢复成IStateManager类型项
/// </summary>
/// <param name="savedState">An object that represents the control state to restore.</param>
protected override void LoadViewState(object savedState)
{
StateBag backState = WebControlUtility.PreLoadViewState(ViewState);
base.LoadViewState(savedState);
WebControlUtility.AfterLoadViewState(ViewState, backState);
}
/// <summary>
/// Saves any state that was modified after the TrackViewState method was invoked
/// 并在SaveViewState之前，将ViewState中所有IStateManager类型项转换为可序列化的ViewSateItemInternal类型项
/// 以及在SaveViewState之后，将ViewState中所有ViewSateItemInternal类型项恢复成IStateManager类型项
/// </summary>
/// <returns></returns>
protected override object SaveViewState()
{
WebControlUtility.PreSaveViewState(ViewState);
object o = base.SaveViewState();
WebControlUtility.AfterSavedViewState(ViewState);
return(o);
}
/// <summary>
/// 判断是否只是输出本控件，如果是则进行只输出本控件处理，否则进行正常的控件输出
/// </summary>
/// <param name="writer">接收控件内容的 HtmlTextWriter 对象。</param>
public override void RenderControl(HtmlTextWriter writer)
{
if (this.RenderMode.OnlyRenderSelf)
{
StringBuilder strB = new StringBuilder();
StringWriter sw = new StringWriter(strB);
using (HtmlTextWriter baseWriter = new HtmlTextWriter(sw))
{
base.RenderControl(baseWriter);
}
WebControlUtility.RenderControlOnlySelf(this, strB.ToString(), this.RenderMode);
}
else
{
base.RenderControl(writer);
}
}
/// <summary>
/// 设置某属性的值
/// </summary>
/// <typeparam name="V">属性类型</typeparam>
/// <param name="propertyName">属性名称</param>
/// <param name="value">属性值</param>
protected void SetPropertyValue <V>(string propertyName, V value)
{
WebControlUtility.SetViewStateValue <V>(ViewState, propertyName, value);
}
/// <summary>
/// 从ViewState中获取某属性值，如果为空则返回默认值nullValue
/// </summary>
/// <typeparam name="V">属性类型</typeparam>
/// <param name="propertyName">属性名称</param>
/// <param name="nullValue">默认值</param>
/// <returns>属性值</returns>
protected V GetPropertyValue <V>(string propertyName, V nullValue)
{
return(WebControlUtility.GetViewStateValue <V>(ViewState, propertyName, nullValue));
}
/// <summary>
/// Causes the control to track changes to its view state so they can be stored in the object's ViewState property
/// 并将ViewState中所有IStateManager类型项标记为TrackViewState
/// </summary>
protected override void TrackViewState()
{
base.TrackViewState();
WebControlUtility.TrackViewState(ViewState);
}
