解决错误：Failed to load viewstate

xblues

Failed to load viewstate.  The control tree into which viewstate is being loaded must match the control tree that was used to save viewstate during the previous request.  For example, when adding controls dynamically, the controls added during a post-back must match the type and position of the controls added during the initial request.

我安排了一个ListView，又增加了一个DropDownList对ListView里的数据进行筛选。DropDownList里增加了 AutoPostback，每次从下拉菜单里选择一个值，页面自动post，刷新返回我筛选的结果。
页面引导以后，第一次筛选可以，再次筛选，报错如上。

解决方法：设置ListView的 EnableViewState="false"

http://social.msdn.microsoft.com/Forums/en-US/vsreportcontrols/thread/69580996-2939-4ff4-8ee3-d3a0b1d25216/
http://weblogs.asp.net/alessandro/archive/2008/01/04/failed-to-load-viewstate-typical-problem-with-an-obvious-solution.aspx

kaisy

Lifecycle of a Web Form
ViewState and its role in ASP.NET page processing
Stage 0 - Instantiation
Stage 1 - Initialization
Stage 2 - Load View State
Stage 3 - Load Postback Data
Stage 4 - Load
Stage 5 - Raise Postback Event
Stage 6 - Save View State
Stage 7 - Render