C# - Is A New Object That's Created In A Static Property Getter Only Created Once
Jan 11, 2010
I'm creating a static helper class for web services I'm writing. I'm tapping into the API of Telligent and therefore creating these Telligent "service" objects that allow me to do things with the platform. For example, I'm creating a MembershipSerice object in my helper class so I can do membership stuff with the same object. In my helper class I have a property with a getter that creates a new one of these objects:
private static MembershipService _MembershipService {
get return new MembershipService(path, usr, pwd);
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I have been using LINQ to SQL for quite a while (about two years). Every thing was fine until now. As usual, I created LINQ to SQL classes and built the project, then created an aspx page. However, I cannot see the DataClassesDataContext in the code behind file. It is not listed in the intellisense list.
My web page has two ways of displaying a particular content. 1. When the page is loaded, the items ( images with anchor tag) are generated using ASP Repeater. 2. When user perform some Ajax action, the images are returned as JSON and I use jQuery for creating the a & img tags.In both these methods, the anchor tags with images are displayed with width 60px. There is no CSS class applied. But strangely the display is not consistent. Here is the both displays:I wonder why this difference occur. I check this with all browsers ( IE,FF& chrome) and all behave the same. Here is my jQuery code:
Any idea why this behaviour occurs? I also checked the css applied to these elements in chrome and FF.. they seems to have all the same CSS attributes.
I have been experiementing with the annonymous types in C#, and am wondering if it would be possible to have a 'dynamic key' in the annonymous object.Here is what I have so far:
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[ { "monday": true } ] what I am getting: [ { "temp": true } ]Is there a way to have the object's 'key' be dynamicly created? What I want it to be able to send the KeyValuePair's key as the object's key. Is this possible?
If I'm not mistaken, I believe that once the EF.SaveChanges() executes, a new entry is created, and a new DateID is generated.I need to get that new DateID.
First time I do it this way, so probably something simple I don't know about. Think the following code explain the "issue" better than I could.
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Basically, if I leave out the _logService instantiation in Application_Error, I get an object reference not set error.However it work fine in Application_End.While I'm at it (know I should start a seperate thread). Any good article to log application errors in Application_Error? (I want to keep the logger out of "catch" blocks" in my classes.) the following does not work out so well for me (Server.LastError are always null):
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Probably how MVC's Handle error attribute deal with things...lemme google on.
I have an already created DataTable object which i am using for my girdview (asp.net) i also need to bind a column of that object to a DropDownList. The datatable has the correct details in the column but the column contains more that 1 of the same name in the column - hence I would love to just do some kind of SELECT DISTINCT on the datatable and copy it to a new datatable for use with binding the dropdown.
This would allow me to save resources by making another trip to the database.
Here is an example, the current datatable has a column called items and in this column has the following entries
1 1 1 1 5 5 6
And of course i need only unique items for binding to my dropdown, hence i need the following data
1 5 6
Of course i don't want to change the original datatable object but rather make a copy of it will the new details.
I have a page, Default.aspx, with its own code-behind file like this:
using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; public partial class _Default : System.Web.UI.Page { public int[] anArray; }
What I'd like to do is access to "anArray" from a C# class (not tied to a page) declared in App_Code folder. What can I do?
Edit: As said in the first comment, I really apreciate your about refactoring my connection objects. However, what I'm really doing here is to rewrite an old PHP application in order to get comfortable with basic C# and ASP.NET, so this code will never go really live. So, I'm still intersted in a way (if any) to access an object declared in a code-behind code from a standard C# class.
Edit2: I removed the OdbcConnection object in order to focus to the real problem: how to refer to an object istantiated in a code-behind file from a C# class situated in App_Code?
I have searched the vast information highway and found nothing but road blocks!I have created a simple web application that calls a COM object like we've all done before. Well this time, the COM interop don't want to work due to DCOM Identity CRISIS. The only way I can get it to work is to physically log in to the web server and thenrun my web application.
I want to dynamically create asp textbox objects (as well as other types) with id's named sequentially up to a number the user decides but I'm having a problem getting my code behind to recognize these dynamically created objects. In "div1" below I manually create the objects and I have no problem getting the values in Sub cmdSaveDiv1Info_Click. My dynamically created code generated in Page_Load routine is identical to that in "div1" except for the textbox ID's yet when I try to retrieve the values the same way in cmdSaveDiv2Info_Click I get an "object reference not set to an instance of an object" error on the "Dim d2Year as String.." line.
I have a registration form. Settings of this form, like which fields are required I get via webservice. So I need programatically validate this form. I decided to create variable count of requiered field validators in Submit click. The validator is created in external object that holds a field settings.
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I tried to debug it and GetValidator() created RequiredFieldValidator, but in btnSubmitRegistration_Click after that, validator was null. Object lost it's reference. Where is the problem?
I've got a set of ASP.Net pages that display a number of asp:TextBox fields depending on the number of entries in a configuration file. I know that the number of fields won't be going above 10 or so. Given that, should I declare a sufficiently large number of text boxes in markup, or should I dynamically create the textboxes in the code-behind?
There are advantages and disadvantages to each approach, which is why I'm having trouble choosing. The advantage to the dynamic approach is that the application is more flexible - even if the number of fields goes above 10, my application will be able to scale. The disadvantage is that I'm now mixing markup and logic - my application is inserting textboxes and literals (for the labels) into the page. This will make future maintenance harder because not all of the fields are in the .aspx file.
The advantage to declaring a large form and then just showing or hiding the necessary fields is that it keeps logic and markup separate. The disadvantage, of course, is that I lose flexibility. If the number of fields goes beyond the amount I anticipate (and there is a small risk of that) I have to revisit the application to add more fields. So, StackOverflow, which would you choose? More importantly, why would you choose your approach?
I'm using jQuery and setInterval method in my asp.net web application.
I call the webservice every 5 seconds in order to check for DB changes. When i see a change, i want to change the photo of the linkButton that located on the master page, but i can to that due to static constrains.
An object reference is required for the non-static field, method, or property 'System.Web.UI.Page.Master.get'
my c# code is:
[WebMethod()] public static bool checkDBChange(string userId) { DBConnection dbConnection = new DBConnection(); if (dbConnection.isChanged(userId)) { ((Site1)Master).SetImageUrl = "~/Icons/a.ico"; } return false; }
The SetImageUrl is a setter in my master page that sets the new url to the linkButton. How I can implement it?
I am getting a CS0120 error when trying turn a button visible after checking some variables. In plain english, If AmmohelpSession.UserActions contains AmmohelpEnums.UserAction.ArticleEdit then turn the Edit button visible. Here is my comparison:
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In the code behind for AmmohelpSession, a public class AmmohelpSession which contains a private variable: private HashSet<UserAction> _userActions; has been stated. In that same file, there is a public function for the UserActions that does a get or set method.In the code behind for AmmohelpEnums, we are setting byte variables to specific actions. Mine would be something like:
I'm creating a Page object and adding a control to it for printing purposes. The code works, however I can not find a way to add a stylesheet link to the header. In the code I pasted I'm trying to add a link to the header and then add the header control to the page, but this causes an error:
Request is not available in this context System.Web.UI.Page.get_Request() +8700216 System.Web.UI.HtmlControls.HtmlHead.RenderChildren(HtmlTextWriter writer) +83.....
I created (and used) a Windows Media Encoder object in Microsoft Visual C# 2008 Express Edition on MS Server 2003 64 bit. This worked fine.
However, when I attempted to create the equivalent Windows Media Encoder object using Microsoft Visual Web Developer 2008 on MS Server 2003 64 bit, the following exception was thrown:
"Retrieving the COM class factory for component with CLSID {632B606A-BBC6-11D2-A329-006097C4E476} failed due to the following error: 80040154."
It cannot be that the component isn't registered, because both have a reference to the same WMEncEng.dll file. The Microsoft Visual Web Developer 2008 code also worked fine on XP 32 bit.
Traditionally with an Object Data Source, the wired up class will have its public properties available for binding (i.e. Gridview columns, etc.) which works well. But what if one of my wired up business objects has a property that is an object itself; can I drill down to a property on that object property and still use it?
So in additiona to the traditional:MyBusniessObject.OrderID...I want to use:MyBusniessObject.Customer.NameID Your 1st response might be to just wire up the 'Customer' class, but I need properties both on 'MyBusinessObject'and 'Customer'. I do not think this can be done, as the ODS will not display properties on an object instance property. I have tried manually typing in the drilled down value as well, but that wasn't a success either.
I am using visual studio 2008 and from toolbox i have used create user wizard. I am able to create users and when a user is created it says successfully created a user.
how can the created users "name" be retrieved. I want to use this name for updating my local database.
