I would like to cache a collection in the viewstate, but I wonder if there is a better way to add an item to this collection!
private List<MyClass> CachedItems
{
get { return (List<MyClass>)ViewState["CachedItems"]; }
set { ViewState["CachedItems"] = value; }
}
private void AddToCachedItems(MyClass item)
{
CachedItems = CachedItems.Concat(new[] { item }).ToList();
}
As it stands right now, I have a literal control on my page. In my code-behind, I'm using StringBuilder to generate some JavaScript. Also on that page I have a item collection. What I want to do is for each item in my item collection, generate my literal which will in essence generate my JavaScript. Here is an example of my code-behind now. I'm ok with doing something different, but I just need to generate said JavaScript for every item in the collection and I'm not sure how to do it.
System.Text.StringBuilder sb = new System.Text.StringBuilder();
sb.Append("<script type='text/javascript'>");
sb.Append("mboxCreate("product_productpage_rec",");
sb.Append(""entity.id=" + _prodID + "",");
sb.Append(""entity.categoryId=" + _categoryID + "",");
sb.Append(""entity.name=" + _prod.Title + "",");
sb.Append(""entity.pageURL=" + Request.Url.ToString() + "",");
//The following value has been taken from the productImageControl code behind.
//Might have to refactor in future as a property of the image control.
string filename = AppSettingsManager.Current.ProductImagePathLarge + _prod.ActiveProductItemCollection[0].Sku + AppSettingsManager.Current.ProductImageExtension;
sb.Append(""entity.thumbnailURL=" + filename + "",");
sb.Append(""entity.inventory=" + _prod.ActiveProductItemCollection.Count + "",");
sb.Append(""entity.value=" + _prod.ActiveProductItemCollection[0].ActualPrice + "",");
sb.Append(""entity.ProductItemID=" + prodItem.Id + "",");
sb.Append(""entity.addToCartImg=~/Images/Buttons/btn_AddToCartFlat.gif");<");
//The last line has to be /script. < inserted on prev line. do not change it or bad things will happen.
sb.Append("/script>");
//add script to page
this.LiteralMBoxScript.Text = sb.ToString();
I have a collection of Contacts that inherits from CollectionBase:
public class ContactCollection : CollectionBase{
//...
}
each contact in the collection has a unique ID:
public class Contact{
public int ContactID{
get;
private set;
}
//...
}
I think what I would like to do is something like the following:
// get the contact by their unique [Contact]ID
Contact myPerson = Contact.GetContactById(15);
// get all contacts for the customer
ContactCollection contacts = customer.GetContacts();
// replaces the contact in the collection with the
// myPerson contact with the same ContactID.
contacts.ReplaceAt(myPerson);
// saves the changes to the contacts and the customer
// customer.Save();
getting an the index of a collection. Here is the code I'm using.
System.Text.StringBuilder sb = new System.Text.StringBuilder();
for (int i = 1; i < _prod.ActiveProductItemCollection.Count; i++)
{
sb.Append("<script type='text/javascript'>");[code]....
What I want to do is get the index of the item in the collection after productpage_rec.
So for instance, the first product would generate like
mboxCreate("product_productpage_rec1"
and so on and so forth for each product in the collection. When I try to build I get the follwong error:
"cannot convert from string to char"
Its tripping up on the product_productpage_rec{0}
There are quite a few questions around this topic,but I can't seem to get it figured out.I'm trying to bind a listbox to an ObservableCollection and keep the listbox updated when items are added to the collection.
[code]...
Beyond this, I have a simple textbox and button on a page.When a name is entered into the textbox,and the button is clickedI call the addBlog(passing in name from textbox) sub routine in the ITRSBlogs Class (back up the page a bit) to add the item to the collection.Problem is,when I add an item to the collection,the listbox is not updated.I'm new to Observable Collections (and many other things : ),so maybe I'm just really off here.
I have never done jquery and need some assistance/advice on something I am trying to do.I basically have an ASP.NET MVC Application.
What I want to do is, asynchronously be able to do a partial postback when a button is pressed.It's a simple application that should add items and retrieve existing items from an IEnumberable<T> collection.
so, when a button is pressed, it should be able to add the item into the collection on the ASP.NET site without having to do a full postback.
I have a list item collection. How to add this list item collection to a datatable.
The list item collection has the following fields:
Student Name, Maths Mark
John 20
Mac 30
John 35
I want to create a html table from the data table, which is grouped on the Student Name field.
I use asp.net 4, ef 4 in c#.I use System.Web.Security to manage users in my web application.
I have a collection of users in MembershipUserCollection and I need remove some users during a foreach on that collector.
I suppose it is impossible to remove an item from the collector when you are looping.
MembershipUserCollection users = Membership.GetAllUsers();
foreach (MembershipUser x in users)
{
if (!Roles.IsUserInRole(x.UserName, "CMS-AUTHOR"))
{
users.Remove(x.UserName);
}
}
Error: Collection was modified; enumeration operation may not execute.
I have a string [] collection, is there any standard function to find string item inside the collection?
View 3 RepliesI am busy building a shopping cart with cookies. I have datalist which I populate from the cookies with a delete button next to each cookie
[Code]....
Now the problem is that when I hit the delete / remove button to expire the cookie, what happens when repopulating the datalist is that it shows the original cookie with all it's values as well as a new entry where all the values are blank.
I have a list of objects that I want to bind to a gridview. Creating that list and binding it works fine for most of the public properties in that list.
There are some objects contained in each of those objects... for instance there is an Address object.
object.Address.Line1;
object.Address.Line2;
When I bind this to my gridview, I have no issues with stuff like object.DateRegistered, but how can I access things like object.Address.WhatEverProperty? I always get this error:
"A field or property with the name 'xxx.xxxx' was not found on the selected data source."
I want to know that how i use the collection class for storing some data and save it letter in the data base.
View 4 RepliesI have an ASP.NET app with lots of textboxes all over the page that need updating at various points through program execution.
These textboxes actually belong to a certain class, so for easy updating I thought I could create a Dictionary(Of string, object) and add the control.ID and the control to it and then for updating do something like this:
(in case of updating textbox.text):
[code]....
However the text property of the textbox does not actually get updated. I'm mainly trying to avoid having to manually do textbox.text = somestring for each one of my textboxes every time I have to update them.
I know that if I have set a cookie on a previous request, it will show up in my Request.Cookies collection. I want to update my existing Cookie. Are the cookies from my Request.Cookies collection already copied to my Response.Cookies collection? Do I need to add a new cookie with the same key using Response.Cookies.Add(), or do I need to use Response.Cookies.Set()?
View 1 RepliesI'm using HttpModule to capture requests to the web server. Before processing the page I'd like to check the values contained in some keys of the Request.Form collection and according to some logic change if necessary. I'd like to do this when BeginRequest event is fired. The problem is that the Request.Form collection is readonly.
View 4 Replies why all the resources in my page are being requested EVERY single time. E.g. my site.css returns the following headers (using fiddler):
HTTP/1.1 200 OK
Server: ASP.NET Development Server/9.0.0.0
Date: Mon, 29 Nov 2010 17:36:21 GMT
X-AspNet-Version: 2.0.50727
Content-Length: 9093
Cache-Control: public, max-age=2592000
Expires: Wed, 29 Dec 2010 17:36:21 GMT
Last-Modified: Mon, 08 Nov 2010 17:20:16 GMT
Content-Type: text/css
Connection: Close
But every time I hit refresh I see all the resources (css,js,images) getting re-requested. I have control over the headers returned for any and all of these resources, but I haven't figured it out yet.I have even debugged my ASP.NET app and the HttpModule is definitely being asked for the resources again.
EDIT:Ok, I removed must-revalidate, proxy-revalidate from the headers and that is getting me closer to where I want to be, now when I press back it still requests my css/js files when I press back.
Is it possible to detect whether an ASP.NET Page is about to be cached and if so, how?The HttpCachePolicy object provides only set-methods. The VaryByParams name-value collection is useless if values other than "None" and "*" are set as it impossible to enumerate them and you can only access them by key
View 1 RepliesI am developing a website in ASP.NET and I am using various javascript frameworks/libraries. The different files belonging to these frameworks/libraries rarely changes thus there is no reason to refresh those files once they have been sent to the client browser (atleast not everytime a page is served).I see that the HttpContext object can be used somehow, that I can set the content expiration on the files/folders on the IIS, or maybe setup somekind of caching in the web.config file. 1. What is best practice/what approach should I take
View 2 RepliesNot really sure how to do this but i can cache the dictionary like this:
Cache.Insert("CacheName", Dictionary)
need some direction. the dictionary is two string values taken from a database. The user will input a string and i need to compare it against the values in the cached dictionary.
I'm having an issue when using the Asp.Net Cache functionality. I add an object to the Cache then at another time I get that object from the Cache, modify one of it's properties then save the changes to the database.
But, the next time I get the object from Cache it contains the changed values. So, when I modify the object it modifies the version which is contained in cache even though I haven't updated it in the Cache specifically. Does anyone know how I can get an object from the Cache which doesn't reference the cached version?i.e.
Step 1:
Item item = new Item();
item.Title = "Test";
Cache.Insert("Test", item, null, DateTime.Now.AddHours(1), System.Web.Caching.Cache.NoSlidingExpiration);
Step 2:
Item item = (Item)Cache.Get("test");
item.Title = "Test 1";
Step 3:
Item item = (Item)Cache.Get("test");
if(item.Title == "Test 1"){
Response.Write("Object has been changed in the Cache.");
}
I realise that with the above example it would make sense that any changes to the item get reflected in cache but my situation is a bit more complicated and I definitely don't want this to happen.
I read few xml files from a location and cache them using Http context cache. Anytime the xml files changes i have to do a IISReset to view the latest changes.
I use this
System.Web.HttpContext.Current.Cache
I have to use the caching as i don't want to read all the xml files all the time. i read it once and caches them for a day. They get reset whenever apppool recyles or anyone manualy do a IISReset.
Is there anyway in asp.net to invalidate the cache if someones changes the xml file.
My web page is still displaying a previously cached versions of the page. I have this in the page_load event:
Response.Clear();
Response.Buffer = true;
Response.ExpiresAbsolute = DateTime.Now.AddDays(-1d);
Response.Expires = -1;
Response.CacheControl = "no-cache";
Response.Cache.SetCacheability(HttpCacheability.NoCache);
I have this in the Page_Init:
protected void Page_Init(object Sender, EventArgs e)
{
Response.Cache.SetCacheability(HttpCacheability.NoCache);
Response.Cache.SetExpires(DateTime.Now.AddDays(-1));
}
There are certain tables that get called often but updated rarely. One of these tables is Departments. So to save DB trips, I think it is ok to cache this table taking into consideration that the table has very small size. However, once you cached it an issue of keeping the table data fresh occurs. So what is the best way to determine that the table is dirty and therefore requires a reload and how that code should be invoked. I look for solution that will be scalable. So updating the cache on single right after inserting will not resolve the issue. If one machine inserted the record all other on the farm should get notified to reload the cache.
View 3 RepliesThe Stylesheet in the App_Theme folder gets cached in the browser. What should be the approach? so that whenever there is a new deployment the browser should take the latest stylesheets and not the one cached in the browser.
This was happening for other css(which are not in theme folder) too, so used custom control as mentioned in the link
[URL]
How this could be done for the CSS in the Theme folder?
Edit: The theme name is mentioned in the web.config as mentioned below. so its not just the html link tag which I had solved by using the method mentioned in the link.
<pages styleSheetTheme="Default">
<controls>
</controls>
</pages>
I would like to ask if there is a way to prevent Firefox from caching scripts (.js files).
I have a project (ASP.Net Web App) with caching issue on firefox. When I first run the application (script is being cached on firefox) and modify the script and rerun the application, firefox is using the cached script instead of the updated one.
I'm using Firefox 3.6.13.
I already tried using HttpHeaders but it seems like firefox is ignoring my codes.
Here is my code:
HttpContext.Current.Response.Cache.SetCacheability(HttpCacheability.NoCache);
HttpContext.Current.Response.Cache.SetAllowResponseInBrowserHistory(false);
HttpContext.Current.Response.Cache.SetExpires(DateTime.UtcNow.AddMinutes(-1));
HttpContext.Current.Response.Cache.SetNoStore();
I tried placing this code at global.asax > Application_BeginRequest and at MasterPage.aspx.cs > Page_Load, but it isn't working.
