.net - Inheriate From A Custom CompositeControl

Jul 7, 2010

I have created a composite control that has some basically functions. I would like to be able to take that composite control and reuse the code.How do I do this? I have created a class and inheriated from my cc

public class PasswordTextBox : RoundedTextBox

now if I add another property to the new cc everything is over however nothing is rendered on the page.

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Custom Server Controls :: CompositeControl Does Not Retrieve FormView Data On PostBack ("Save")

Feb 10, 2010

Background:I'm building a custom control as a base class that derives from CompositeControl. It consists of a FormView, a ObjectDataSource and a CRUD-Button Series (Create, Read, Update, Delete - Buttons). I'm loading the different FormView templates within the deriving classes dynamically from file with Page.LoadTemplate().

Class structure:

TabControlBase:CompositeControl

Employer:TabControlBase

Applicant:TabControlBase

Each deriving class knows the specific template-paths for loading FormViews templates.

The ObjectDataSource is connected with a DAL using a Select and an Update Method. The Select-Method works fine: When loading the CompositeControl the data of the DAL are shown in the Labels of the embedded FormView (ReadOnly-Template). When I'm switching to Edit Mode the data also are displayed in the TextBoxes (Edit-Template).

The problem occurs when I'm trying to update data using the "Save" - Button: The connected DAL-Method is calling properly, but the parameters all are NULL.Tree structure of this custom control:

Panel -
--- FormView
EditTemplate (ascx): Name, Name1, Segment
--- ObjectDataSource
--- CRUD-Button Stack: New, Edit, Delete, Save, Cancel, Copy, Print

All controls will be added dynamically in the base class "TabControlBase" within the overridden CreateChildControls - method. The CreateChildControls method is called by the deriving classes e.g. Employer after setting specific properties e.g. templates,
object data source methods etc.The control is placed in a simple abc.aspx-Page. What I detected so far on PostBack

- When I'm looking at the ViewState Collection within the OnLoad-method of the abc.aspx the ViewState-Collection is Null (Count = 0)

- It seems that the control tree is empty. I'm not able to find any control using a proper working recursive FindControlMethod

- Only the Page.Request Collection shows the expected controls

Conclusion for now:It seems that the CompositeControl "forgets" the values of the FormView TextBoxes on PostBack. It seems it has to do with ViewState Management.

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Should A DropDownList Within A CompositeControl Remember Selected Item

Jul 6, 2010

Given the following

public class MyControl : CompositeControl
{
private DropDownList myList;
protected override void CreateChildControls()
{
base.CreateChildControls();
myList = new DropDownList();
myList.AutoPostBack = true;
this.Controls.Add(myList);
if (!Page.IsPostBack)
{
myList.DataSource = MyBLL.SomeCollectionOfItems;
myList.DataBind();
}
}
}

I find that the items in the list persist properly, but when a different control is rendered and then this one is rendered again, the last selected item is not persisted. (The first item in the list is always selected instead)

Should the last selected item be persisted in ViewState automatically, or am I expecting too much?

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C# - Persisting A Collection Backed By Viewstate In A CompositeControl?

Apr 28, 2010

Maybe it's been a long day but I'm having trouble persisting a collection backed by the ASP.NET ViewState in a CompositeControl. Here's a simplified version:

public class MyControl : CompositeControl
{
public Collection<MyObject> MyObjectCollection
{
get {
return (Collection<MyObject>)ViewState["coll"] == null ?
new Collection<MyObject>()
: (Collection<MyObject>)ViewState["coll"];
}
set { ViewState["coll"] = value; }
}
}
public partial class TestPage : System.Web.UI.Page
{
protected void btn_Click(object sender, EventArgs e)
{
myControl1.MyObjectCollection.Add(new MyObject());
}
}

When the button is clicked, the event hander btn_Click executes fine, but the setter for MyObjectCollection never gets called, hence the new MyObject() never gets persisted.

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Custom Server Controls :: Custom Tag Not Found For Control / Error: Unknown Server Tag 'custom:AjaxValidator'

Jan 3, 2011

Hope this is the correct forum for this question. I am using VWD 2010 an have a web project and get the following error upon execution:

Parser Error Message: Unknown server tag 'custom:AjaxValidator'.

My code is as follows in the .cs file:

[Code]....
[Code]....

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Custom Server Controls :: Custom Composite Control With Custom Templated Child Controls?

Mar 22, 2011

I am trying to build a custom composite control, which allows me to add custom content to each child control. It's a similar concept to what you have with a GridView and TemplateColumn. The markup used to place the control on the page would end up being something like this:

[Code]....

I have the code below, which allows me to put that markup on the page without throwing any errors, and it renders all the correct HTML, except it doesn't render the contents of the ColumnTemplate. I have replaced the Render() code with a comment because it's quite long winded and doesn't add anything important here:

[Code]....

I have tried to follow examples on MSDN and other forums but I can't make this work. I think I'm missing the code to render the contents of the template, but I don't know how to hook that up.

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Custom Server Controls :: How To Create Custom Property (DataSource) In Custom Controls

May 15, 2010

I know that how to create custom control and add custom property.

I want to create property like DataSource to my custom control.

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How To Bind Form Collection Back To Custom Model Object That Uses 2 Custom Objects

Mar 23, 2010

What I'm trying to do is rather basic, but I might have my facts mixed up. I have a details page that has a custom class as it's Model. The custom class uses 2 custom objects with yet another custom object a property of one of the 2. The details page outputs a fair amount of information, but allows the user to post a comment. When the user clicks the post button, the page gets posted to a Details action that looks something like this:

[AcceptVerbs(HttpVerbs.Post)]
public ActionResult Details(VideoDetailModel vidAndComment) { ....}
[Code]....

The only fields on the form that is posted are CommentText and VideoId. Here is what the VideoDetailModel looks like.

public class VideoDetailModel
{
public VideoDetailModel()
{
[Code]....
I suppose if I added more form fields for the properties I need, they would get posted, but I only need 1 form entry field for the CommentText. If I could get the same Model objects value that were sent to the page to post with the page, it looks like the solution is rather simple. I think using the RenderPartial in the middle of a form is problematic somehow to how the form gets written in html. I can't really put my finger on why things went bonkers, but if I do my RenderPartials before my form and then begin my form with the text entry field and the hidden VideoId, the default ModelBinder works just fine. I was beginning the form, writing the hidden VideoId, rendering several partial views, create my CommentText field, and then closed the form out. The CommentText field would get bound just fine. The hidden VideoId would not. Maybe I missed a rule somewhere about using RenderPartial.

For completeness, the partial view I was rendering took a Comment object and just wrote out it's CommentText data. Several of these objects would exist for a single Video object. All of this data was in a custom type and passed into the View (the main view) as it's Model. This partial view did not have a form and did not have any data entry fields.

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To Create A Custom Control That Adds Other Controls Visible To The Page Hosting My Custom ?

Oct 22, 2010

I want to create a custom control where I define several specifically named DIV sections. The code-behind logic of the custom control will perform operations on these named DIV sections. The page where the custom control is hosted needs to be able to add named controls to the DIV sections and perform operations on these named controls added to the DIV sections.

Let me explain a little further. In the custom control, I want to have code behind logic that fires the following Page Event and uses a condition to make one or another specifically named DIV section visible or not:

< _
ToolboxData("<{0}:BaseDetails runat=""server""></{0}:BaseDetails>") _
> _
Public Class BaseDetails

[code]...

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I have a custom radiobutton and it renders fine but loses state after postback.

How can it be modified?

[Code]....

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[Code]....

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I have created a really simple custom control to render panels into a page. The code is below. When I use my control and add any webcontrol to it, after each page postback the contents of these child controls vanishes.

I must have missed something really simple but run the example to reproduce this. Can anyone please enlighten me as to why the controls are being 'emptied' of their contents, and how I stop this occuring?

Here is the code for the control

[Code]....

And here's how I am using it in a sample page:

[Code]....

[Code]....

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Error 20 The type or namespace name 'IContentMaker' could not be found (are you missing a using directive or an assembly reference?)

notge that I have inherited the class library namespace using the 'using' keyword just in case you are wondering. My code is like so:

using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using TQO_Classes ; //importing the class library project
public partial class PageContentMgr : System.Web.UI.UserControl
{
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Custom Server Controls :: Register Tagprefix For A Custom Control That Inherits Treeview?

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I have an ASP.net web application project written in VB. Am trying to test a cobbed-together "MyTreeview" control put together from C# code that's been converted.

I think this will come "close" to what I'm trying to do - just get a treenode to have a CSS tag and render properly.

I have an App_LocalResources directory and a file called CustomTreeNode.vb. Inside that file is the following code:

[Code]....

[Code]....

[Code]....

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I have a Custom Server Control with a Collapsible Panel Extender. I want to be able to keep the Collapsable state (open or closed) when doing a Post Back.

Here is my Custom Control's ASP code:

[Code]....

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Custom Server Controls :: Custom Checkbox Control 'checked' Property Is Not Working?

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Iam developing a custom checkbox control deriving from the 'compositecontrol' which i need to use it for a composite control purpose.

public
class
TngCheckBox :
CompositeControl
{

i have written the required properties which are working fine except the "checked" property. here is my code for 'checked' property. i tried both the below ways (commented one and not commneted) . the problem is the 'checked' value is not setting the value at the get set part of the property.its assigning the value at the design time , but when i check and uncheck its not updating the property value.which is resulting me wrong .

[Code]....

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Custom Server Controls :: Custom Checkbox Control 'checked' Property Is Not Working ?

Oct 15, 2010

Iam developing a custom checkbox control deriving from the 'compositecontrol' which i need to use it for a composite control purpose.

public
class
TngCheckBox :
CompositeControl
{

i have written the required properties which are working fine except the "checked" property. here is my code for 'checked' property. i tried both the below ways (commented one and not commneted) . the problem is the 'checked' value is not setting the value at the get set part of the property.its assigning the value at the design time , but when i check and uncheck its not updating the property value.which is resulting me wrong .

[Code]....

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I have built a custom control. when i add this custom control in my page twice or more then the it write only one time of its render contest data.

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public class Textbox : WebControl
{
}

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Property Code Example:

[Code]....

I've even removed the Category and Description tags with no difference.

I don't know if what I said makes sens, but I hope it does.

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