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Item Type: NewsGroup Date Entered: 10/29/2003 2:37:44 PM Date Modified: Subscribers: 0 Subscribe Alert
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NarcisoLema
Asp.Net User
Updating attributes in the design mode tag of a WebControl.10/29/2003 2:37:44 PM

0/0

Hi!
I have a problem with a control at the time when I update one of her properties in the Properties Window.
I have made a control that one of her properties is another webcontrol, so when you see this in the Properties Window, you see a list of controls of the same type expected in my control.
So when I select one of the controls of the page in the list, i build the project the property is set to none again.

This is an example of the code I use to make my control:

[Designer("MyWebControls.Designers.MyDataGridValidatorDesigner")]
public class MyDataGridValidator : WebControl{
private MyDataGrid _MyDataGridToControl;

[NotifyParentProperty(true)]
public MyDataGrid MyDataGridToControl{
get{ return this._MyDataGridToControl; }
set{ this._MyDataGridToControl = value; }
}

...
}

What im looking for is the same behavior of a validator control, that you set the control that you want to control. But when you update this property in the Properties Window, the validator control tag change and put "ControlToValidate=MyTextBox" for example.
The validator only put the name of the control in tag, some other tags like the DataGrid puts <%# mydataset %> for example in the DataSource.

So how I can get that behavior in my control, what attribute o other kind of solution will be.

Thanks for all,

Narciso.
Andy Smith
Asp.Net User
Re: Updating attributes in the design mode tag of a WebControl.10/29/2003 4:50:39 PM

0/0

The validators use a String property which is the ID of the control, not the control itself. They then use a TypeConverter attribute on the String property to show a dropdownlist of control ids that come from the controls on the page that are validatable. If you want to a similar DropDownList for your string property, you can use the typeconverter code I posted in my blog.
NarcisoLema
Asp.Net User
Re: Updating attributes in the design mode tag of a WebControl.10/30/2003 1:39:48 PM

0/0

Thanks Andy for your help in this case, but if like the behavior of the DataGrid with their DataSource property when you select a dataset from the list in the Properties Windows, they put a scriplet in the design mode tag like this <%# dataset1 %>, how can i do this with a my control?

Andy Smith
Asp.Net User
Re: Updating attributes in the design mode tag of a WebControl.10/30/2003 6:38:48 PM

0/0

What I'm saying is that you neither should nor want to do that. You should use the related control's ID, not a reference to the control itself. Of course, you could have a private property that gives you a reference to the datagrid itself, by using FindControl to get it.

But you should use the ID for a variety of reasons. One very good one is that you don't have to use DataBinding ( that's what the "<%#" syntax does ) to set the property. DataBinding is a fairly expensive operation. Another is that an ID can be stored in viewstate, and hence you can easily persist changes to the property. A reference-based property cannot be stored in viewstate.
4 Items, 1 Pages 1 |< << Go >> >|


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