问题
I have an asp.net label control with its Visible property set to false. In the code-behind I'm setting its visibility to true/false based on whether the user has logged in or not. A weird behavior is that on postbacks, the code-behind executes and sets the value of the label's visibility to whatever, and then the markup executes and sets the label's visibility to false. On non-postback requests, the status set by the code-behind is not overwritten. Pardon my ignorance, but am I missing something important?
回答1:
Get to know the page lifecycle, and when the various page events are fired by the runtime.
http://msdn.microsoft.com/en-us/library/ms178472.aspx
Also, I don't think the code is insignificant. If it were coded properly, you wouldn't be experiencing this problem. Put it up here and let us have a look.
回答2:
There's no code posted so you might already have this.
are you wrapping everything in your Page_Load method with
if(!Page.IsPostback)
{
// your code here.
}
?
回答3:
does your Label has a EnableViewState="false" attribute?
Learn more on this attribute at http://www.w3schools.com/ASPNET/aspnet_viewstate.asp
来源：https://stackoverflow.com/questions/584747/postback-issue-in-asp-net