Extending A Control - Just Inheritance By Another Name?
Aug 15, 2010When people talk about extending a control are they just talking about inheritance?
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Similar Messages:
Extending A DropDownList Control?
Apr 18, 2010I have a rather large application that has literally a hundred DDLs with Yes / No ListItems. In an attempt to save myself some time, I created a custom control that extends the standard DDL.It all seems to work fine but I am having some issues when assigning the SelectedValue property in code where the selected value does not seem to have an affect on the control. I wonder if I should be adding my items during Init or PagePreLoad? Should I be calling base.OnInit before or after I add the list items? This mostly works but not 100%. (v3.5)
public class YesNoDropDownList : DropDownList
{
protected override void OnLoad(EventArgs e)
[code]...
DataSource Controls :: Extending The EntityDataSource Control?
Mar 15, 2010What would be the best way to extend the EntityDataSource control? I have a site that implements Entity Framework and I current create my model container and add it to the HTTPCurrent context. When I create EntityDataSource controls on the page I have to go into the code behind and set the OnContextCreating to add MY context to the EntityDataSource instead of the one that EntityDataSource creates. This is because in my model I have extended the Partial Classes to support Validation and custom Save/Delete methods.I would ideally like to create a custom control that I can drop onto a page that has its context already set to the context that I created.
View 1 RepliesWhat's The Best Method For Extending The Functionality Of A Standard Web Server Control
Nov 21, 2010Currently my code resembles this:
<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="CustomPanel.ascx.cs"
CodeFile="CustomPanel.ascx.cs" CodeFileBaseClass="System.Web.UI.WebControls.Panel"
Inherits="MyProject.CustomPanel" %>
...
namespace MyProject
{ public partial class CustomPanel : System.Web.UI.WebControls.Panel
{ ... }
}
However, I'm really not sure how to proceed from here, because this does not appear to follow a logical inheritance path that includes System.Web.UI.UserControl / Am I doing something wrong? How can I inherit Panel and extend standard event-handlers, such as PreInit?
Custom Server Controls :: Extending Gridview Control?
Mar 24, 2011I'm trying to extend GridView control following these steps:Create a namespace in an empty Visual Basic file: mycontrols.vb
[Code]....
Register it in the WebForm I want it to be
[Code]....
Create the control in my WebForm:
[Code]....
I get an error as tag prefix unknown, and in my code behind file, the control doesn't recognize the primitive GridView properties and methods.
Custom Server Controls :: Extending GridView Control (II)?
Mar 30, 2011I'm trying to extend de GridView control with a Custom Server Control, I'm doing ok with extended properties but when I get to methods that need to re-apply or modifiy the DataSource I don't get any data in the grid, though the SQLDataSource actually retrieve data. Here is my MyGridView.applyFilter() method, which should filter the data but actually shows an empty GridView, but as I sayed, the DataSource has data. I try to find (FindControl) theSQLDataSource of the GridView (Me) and modifiy its paramters, thenDataBind Me to apply the changes...
[Code]....
What am I doing wrong? why is the gridview empty?
UserControl Inheritance - Web Controls In Base User Control Are Null Pointer
Mar 1, 2010i have a base user control (WC1) which inherits from WebUserControl and a child user control (WC2) which inherits from WC1. I added a textBox and a label to WC1 in vs design view not code behind. But all the server controls that i put in WC1 are null and give null pointer exception.I tried to access textBox and label in different events but the all of them are null.
Steps to reproduce the error:
create a web user control called WC1 by add a new item in VS added a textBox and label server control to WC1 in design view of VS and put code behind: var value = txetBox.Text; created another web user control called WC2 by add a new item in VS and change its base class to WC1 in its code behind create a web page by adding a new item in vs and drag WC2 to the design view of the page run the page then you will see the exception for the codebehind in WC1
[code]....
page:
<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="WC2.ascx.cs" Inherits="WebApplication1.WC2" %>
can web server controls of WC1 be instantiated in this case? or can user control inherit from another user control and web server controls of parent user control be carried to its children without worring the layout?
Custom Server Controls :: Extending GridView To Enforce It To Have A Specific Control?
Feb 23, 2011I'm trying to extend the GridView into a custom/user control "WorklistGridView". And I'm not quite sure how to do it... so here's what I need:Every row needs to have a control (either a boundfield or a templatefield with a label, etc.) that contains the StepID (which is a column returned in the data set).I want to be able to use the WorklistGridView as a base class and extend it to something like "XyzWorklistGridView", where that child class would have a few more controls in the row template.
View 2 RepliesCustom Server Controls :: Extending A Control And Losing Values On Postback?
Nov 24, 2010I've created loads of user controls, but this is my first time dealing with extending a server control. The problem I'm getting is that the base control's data is not being persisted across postbacks in a Master/Content page.I'm actually trying to get this working using a Telerik control (for my sins), but the same issue happens with a standard Web TextBox control. Code:
[Code]....
Now, I've copied the way I handle the control state as I do it with user controls (ControlState), and it isn't working. Can someone point me in the right direction please? All the examples I find refer to creating user controls, not extending existing controls. Specifically why nothing is being persisted on post back.
Best Configuration In CTP 5 For Inheritance ?
Feb 1, 2011 what is best to use in CTP 5 for inheritence. Ive heard of 3 ways of doing it. (This is indirectly addressed to Serenarules )
Table per Hierarchy ?
Table per Type ?
or able per Concrete Type ?
For those who wondering what the hell is that.. refer to http://weblogs.asp.net/manavi/default.aspx which is a nice blog about inheritence and polymorphism in CTP 5.
Mvc - ASP ActionFilters And Inheritance
Jul 16, 2010All my controllers inherit from a BaseController that has an ActionFilter attribute:
[AnalyticsData]
public class BaseController : Controller {}
public class AccountController : BaseController {}
Some of my Actions in my controllers reuse the AnalyticsData ActionFilter:
public class AccountController : BaseController
{
[AnalyticsData(Page="AccountProfile")]
public ActionResult Profile()
{
// return View
}
}
I notice that the AnalyticsData ActionFilter only runs once. This is a good thing and I only want it to run once, but I'm wondering how that happens. If I set my breakpoint inside the OnActionExecuting:
public class AnalyticsAttribute : ActionFilterAttribute
{
public override void OnActionExecuting(ActionExecutingContext filterContext)
{
// break point set here
}
}
only gets hit once when AccountController serves it Profile view. How do ActionFilters and/or Attributes work that [AnalyticsData(Page="AccountProfile")] on the Action overrides/replaces [AnalyticsData] on BaseController?
Multiple Inheritance Not Supported
Feb 6, 2010Can anybody tell me why multiple inheritance is not supported in C#?
View 9 RepliesC# - MVC Multiple Inheritance In View
Mar 1, 2010I'm trying to figure out if its possible to have multiple inheritance in a view in ASP.Net MVC. Right now I'm trying to print out a list of entries from two different tables from my model in a single View. I have the following line at the top of my view:
Inherits="System.Web.Mvc.ViewPage<List<GEApproval.Models.CoursePrefix>>"
But I also want to include the table Course as follows:
Inherits="System.Web.Mvc.ViewPage<List<GEApproval.Models.Course>>"
I went ahead and created a composite class as follows:
namespace GEApproval.Models
{
public class Listings: GEApproval.Models.CoursePrefix, GEApproval.Models.ICourse
{
public List<CoursePrefix> CoursePrefixObjList { get; set; }
public List<Course> CourseObjList { get; set; }
private GEApprovalDataModel _db;
//Constructor
public Listings()
{
_db = new GEApprovalDataModel();
}
//Generate a list of all courses associated with the prefix and place in ViewData model
public void listCourses(ViewDataDictionary viewData, int prefixID)
{
var test = _db.CoursePrefix.Include("Course").First(cp => cp.id == 1);
//Show total courses for this prefix
viewData.Model = test.Course.ToList();
viewData["prefix"] = test.Prefix;
viewData["courseCount"] = test.Course.Count;
int courseCount = test.Course.Count();//Test
}
}
}
And in my view, I now have the following line:
Inherits="System.Web.Mvc.ViewPage<List<GEApproval.Models.Listings>>"
I'm still a little confused because I still cannot access the properties of the Course object when listing them in my view, because I'm only inheriting directly from CoursePrefix. I'm not sure what I'm missing. Do I need to have a constructor for the composite object? Do I need the inherit and implementation statements for CoursePrefix and ICourse respectively if I'm already, supposedly, exposing the properties of each within the Listings wrapper class?
Inheritance - Extend Whole Website In Asp?
Mar 10, 2011I work in a web agency and thus we are plenty of websites from several customers. They're built upon a cms we made, so websites are quite identical for the 90% of code. However, remaining 10% struggles me and my team as it involves not only the presentation layer but behavioral logics too (ex: a website1 requires simply user/pass registration while website2 needs more data, facebook connector, etc. But this is a very easy example). Making ad hoc development for our customers is becoming painful as keep each version aligned is getting really hard for us What I really dream to have is an extendible website that works by itself, but in which I can override a part. This behavior should sound like "look for the specific part, if it doesn't exists get the base one". The parts could be a method, a class, a page, a control, a static file.
example:
Suppose I want website2 to have an own login component, let's so imagine that we have a situation like:
/website_base
|_ login.aspx
/website1
/website2
|_ login.aspx
So, if I ask for [URL] I'll get /website_base/login.aspx, but if I ask for [URL] I'll get /website2/login.aspx
C# - EF4: Compex Inheritance With Interfaces?
Mar 17, 2011I'm using EF4 to generate a model. My architecture looks like this:
IMyEntity (custom interface)
-> MyEntity - EF generated class
IMyOtherEntity (custom interface)
-> MyExtendedEntity (Customn Partial class) : MyOtherEntity (EF Generated)
The first entity has a list of MyExtendedEntity. Is there any way I can bind this with the entity framework. I'm targetting ASP.NET and WPF. The main probnlem I have is that I need an ObservableCollection in WPF, while the EF generated class only has an EntityCollection which doesn't even seem to derive from ObservableCollection.
C# - Dynamic Inheritance Using A Factory?
Oct 11, 2010I think I know the answer to this but hoping someone has a neat solution. We are currently using two kinds of drop down controls (telerik and .net). I'm hoping to combine these into one control but struggling with a user friendly design.
Ideally the control would be created in the design file with a bool property of say "SimpleBox", to determine which kind of control to inherit. The instantiation would then be generated in the code behind design file and the constructor would then dynamically load the base (which isn't possible). The easy solution would be for me to create a IDropDown interface then have a factory create the correct one. The only real problem with this is the fact the instantiation has to be manually written every time. Which is a hassle, and does not speed up our process at all.
Although it isn't directly possible i'm looking for a solution along the lines of a factory which is ran inside the object constructor for setting the base, based on a bool property.
WCF / ASMX :: Does Inheritance Is Possible In Webservices
Oct 25, 2010Am new bee to Webservices.I have declared complete BLL in the class library.
Can call those methods defined in Class library class files(.cs file) in .asmx file.
Using Or Extending ESAPI.NET V0.2?
Nov 30, 2010I've been recently tasked with leading an effort to improve our input (and output) validation with OWASP recommendations and PCI compliance in mind. In the process, I'm trying to assess the value of the ESAPI.NET project which does not appear to have seen any activity since the spring of '09 and as it stands is incomplete.
Does anyone have experience using or extending ESAPI.NET v0.2? Is it a good starting place today for building out an infrastructure to address the targeted vulnerabilities?
FYI: I am looking at MS AntiXSS which, of course, only addresses a portion of ESAPI's scope. We already do a good job with SQL injection though there are improvements we need to make.
C# .NET MasterPage Nested Inheritance Is Evil?
Oct 9, 2010I have a solution with quite a few different MasterPages / BasePages which all inherit from somewhere else. My problem is that I have a virtual string in BaseMaster, which is overridden by BaseManagement, but when I try to access this string I always get the base valueThe point of inheriting masters and pages is obviously to avoid having duplicate code everywhere.
View 1 RepliesEntities Framework 4 Code First: Inheritance
Oct 11, 2010I am currently trialing EF4 code-first. My POCO classes inherit from an Audit class that contains CreatedBy, CreatedOn, UpdatedBy, UpdatedOn. I was hoping the framework would include the Audit properties in my Action table when creating my database, however this doesn't appear to be the case. Does anyone know how to enable this without overriding the OnModelCreating() method?
Public Class Audit
Public Property CreatedOn as DateTime
End Class
Public Class Action
inherits Audit
Public Property ActionId As Int32
End Class
ADO.Net EF, Inheritance Table Shows But Not The Model?
Mar 27, 2011I have created a Entity named MediaItem which is Abstract and Game inherits form it. I create the database automatically and I get a table MediaItems and MediaItems_Game.
The issue is when I do the following in my ASP.Net Controller:
private Models.DBContainer dataModel = new DBContainer();
dataModel. ---> Intellisense shows me MediaItem but I can find no way to either navigate to or use MediaItems_Game, how can I solve this? i.e. How can I grab a list of 'Games' with some 'WHERE' constraints on another table (not pictured).
Web Forms :: ASP Page Inheritance And Controls
Mar 4, 2010I have ASP.NET Page - PageBase and some pages that inherits this page:
public class PageBase : System.Web.Page
public class SomePage : PageBase
I would like to have some controls placed in PageBase that every page that inherits from this page (like SomePage example) will have it displayed as well. This works perfectly in WinForms. If I place control (in designer mode) to WinForm A, I will get it displayed in form B - that inherits from A. This is perfect for building complex solution and I need to extend my WinForm solution to web.How will I do it in ASP.NET?
Master Page Inheritance - No Design
Sep 23, 2010I have a problem with Master Page InherItance. I make master page Item and past Index in the source of Master page Item and Design of Master Page is Ok but in Web page , in Source , I whrit ,
Page
Language="C#"
AutoEventWireup="true"
MasterPageFile"~/MasterPage.master"
CodeFile="Default.aspx.cs"
Inherits="MasterPage"
but the Design of Web Page , isn't ok no Design , and I don Know What I can do with COde
AJAX :: Site Inheritance With BaseAddressPrefixFilters
May 20, 2010I'm using VS2008, and I've got 10 ASP.NET 3.5 sites which all have a virtual directory which maps to one ASP.NET 3.5 subsite.
I'm trying to get a WCF service to work with client-side ajax on the subsite. I've modified my web.config file on the subsite to use baseAddressPrefixFilters, but I can't get this to work with every site. For example, I can add an entry for one site, but the ajax calls will only work for that one site. All the other sites will fail.
C# - Add Function To Built-in Class Using Inheritance?
Mar 21, 2010I'm trying to add a IsImage property that I wrote myself to the HttpPostedFile class, so that if a user is uploading a file, I can do something like this:FileUpload1.PostedFile.IsImageHow can I do that in C#?
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