c# – ASP.NET WebForms自定义UserControl – base.SaveViewStat

我有一个自定义UserControl我正在使用哪些主机动态创建控件,我遇到了一个奇怪的情况,我似乎失去了ViewState信息.在我对base.SaveViewState()调用的重写的SaveViewState方法中,我希望它返回一个包含ViewState中所有内容的对象,但它返回null.

protected override object SaveViewState()
{

    object[] tempState = new object[2];
    tempState[0] = base.SaveViewState(); //***suspected issue here,tempState[0] == null -- why?
    //? this.ViewState["CompanyID"] returns me the guid I'm expecting
    //... code instantiating and populating lstDataControlInfos
    tempState[1] = lstDataControlInfos;
    return tempState;
}

我在该方法中放置了一个断点,我可以使用立即窗口查询ViewState [“CompanyID”]并验证ViewState中确实存在一个CompanyID.也许我误解了一些关于ViewState的东西,但该调用是否应该返回已经存在于ViewState中的内容(包括我的CompanyID)？在重写的LoadViewState方法中,问题在回发上成为问题,因为我不再有任何方法将CompanyID从ViewState中取出;它回来了.

protected override void LoadViewState(object savedState)
{
    object[] tempState = (object[])savedState;
    //tempState[0] == null,as it was stored in the previous SaveViewState call
    //any reference to ViewState["CompanyID"] comes back null
    base.LoadViewState(tempState[0]);
}

我提到我有动态控件我正在序列化并从此控件中的ViewState反序列化,这些似乎都正常工作.什么会导致base.SaveViewState()在我知道事实时返回null并且可以在SaveViewState调用期间验证(通过立即窗口)ViewState中是否有数据？