如何清除Viewstate？

Question

I am having a problem in which two controls which are added programmatically are trying to load each other viewstate, I want to clear the viewstate before loading the controls, I tried Viewstate.Clear but it did nothing, when I disable viewstate on the container of my controls everything works fine except that the control's state is not kept. Is there a way to clear viewstate of just a specific control?

Answer 1

From your description, it would seem that you are making one of the common mistakes when loading your dynamic controls - either you are loading them too late or you are not assigning them unique IDs (and assigning them the same unique id each time a postback occurs ).

If this is indeed your problem, then clearing the viewstate is not the appropriate action to be taking. It is quite simple to fix, check these three links:

http://msdn.microsoft.com/en-us/library/ms972976.aspx

http://www.4guysfromrolla.com/articles/092904-1.aspx

http://geekswithblogs.net/shahed/archive/2008/06/26/123391.aspx

Answer 2

Yes ,

string controlName = "name of control";
ViewState[controlName] = null;
// create control, add it to the page

Answer 3

If ViewState gets in your way and you haven't done so already, please read

TRULY understanding ViewSate

It will make you much more comfortable in working with ViewState and the whole ASP.NET page lifecycle.

Answer 4

Assuming both controls inherit from System.Web.UI.Control . You can disable their individual ViewStates by setting their EnableViewState to false. Also you can clear their ViewState, as each control has a ViewState property.

Answer 5

确保两个以编程方式添加的控件的ID不同，并且ViewState问题应该消失。

Answer 6

您可以在特定控件上禁用viewstate：

EnableViewState="False"