c# - viewstate variable is always available? -


i thinking if custom made viewstate variable available on each page visit (same browser session) (like session client-side) or @ page postback? know client-side data encapsulated request packet , response packet server.

i testing right now, , did following:

on home.aspx:

protected void page_load(object sender, eventargs e) {     viewstate["test"] = "test1"; } protected void button1_click(object sender, eventargs e) {     string test = viewstate["test"].tostring();      server.transfer("default.aspx"); }

and on default.aspx:

protected void page_load(object sender, eventargs e) {     string test = viewstate["test"].tostring(); }

but nullreferenceexception. means viewstate["test"] doesn't exists because viewstate new , regenerated. conclusion can use viewstate variables when doing form postback (but in fact, redirect after form postback, can't use viewstate always...).

am right opinion?

viewstate can configured in different ways, different (or custom) providers, or can disabled. however, default provider is form-field, yes: in default configuration case exist on post, , not exist get. transfer operates essentially get.

if need data between unrelated pages, user-related - use session-state, or cookie-based.

in unrelated news: view-state pretty horrible in many ways - think of kittens!


Comments

Post a Comment

Popular posts from this blog

java - Play! framework 2.0: How to display multiple image? -

i need display gallery of photos. here template: @(photos: list[photo]) @title = { <bold>gallery</bold> } @main(title,"photo"){ <ul class="thumbnails"> @for(photo <- photos) { <li class="span3"> <a href="#" class="thumbnail"> <img src="@photo.path" alt=""> </a> </li> } </ul> } and here controller method: public static result getphotos() { return ok(views.html.photo.gallery.render(photo.get())); } and here photo bean : @entity public class photo extends model { @id public long id; @required public string label; public string path; public photo(string path, string label) { this.path = path; this.label = label; } private static finder<long, photo> find = new finder<long, photo>( long.class, photo.class); public static list<phot...
Read more

gmail - Is there any documentation for read-only access to the Google Contacts API? -

i want read-only access user's google contacts. there stackoverflow member wanted this, , received following answer : yes, there is, use https://www.googleapis.com/auth/contacts.readonly scope , "view contacts". this exchange reference read-only access google contacts can find using google. simply using access token obtained attempt read usual google contacts api (i.e. https://www.google.com/m8/feeds ) fails insufficient permissions. similarly, using google contacts api on new target fails 404 errors (for example https://www.googleapis.com/auth/contacts.readonly/default/full ). is there documentation anywhere on how use api, or permissible way access google contacts api full read-write access?
Read more

php - Controller/JToolBar not working in Joomla 2.5 -

relevant code: jtoolbarhelper::custom('savecategories', 'save', '', 'save', false, false); ... <input type="hidden" name="controller" value="easyblogcontroller"> according can dig docs , own previous questions, should call savecategories() function in easyblogcontroller . i've tried setting value easyblog , easyblog.php (file name) current easyblogcontroller (class name). clicking on save button refreshes page. not redirect, echo or var_dump test code put in savecategories() function. var_dump ing jrequest::getvar('controller') , 'task' return correct values. creating controller object , using $controller->execute('task'); works. the values going depend on location of controller trying call, , have couple options here. typically there controller in base folder of component (likely components/com_easyblog) in file called controller.php , class name inside ...
Read more