Re: Java vs .NET - Open Source - C# Discussion Boards

Custom properties for inherited button control

akamper16-Mar-09 3:56

16-Mar-09 3:56

Hello

I've tried a lot of things already, but haven't got/found a satisfying solution.

Problem:
I have a custom control that inherits from Button. It's properties are shown in a PropertyGrid.
This control has some additional properties (which is no problem), but
I don't want to show all the standard properties like the whole Accessibility-Category and some more.

So is it possible to tell the propertygrid or the control which properties are going to be shown and which are not?

I have found to override and set the properties to "Browsable(false)", but isn't there more elegant and cleaner way to do this?
Is it possible to exclude a whole category?

The ideal case would be that my customButton only shows the Appearance, Behaviour, Design and Layout Cetagory and my own properties, but nothing else.

Thanks a lot in advance for your help

Re: Custom properties for inherited button control

DaveyM6916-Mar-09 4:57

DaveyM69

16-Mar-09 4:57

No, unfortunately not. That's the idea behind inheritance, you add to something, not take away from it. MS do it themselves of course but they don't give us the option.

The best you can do is declare the property as new instead of override, that way you can make it readonly by only providing a getter and decorating with these attributes.

[Browsable(false),
DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden),
Obsolete]
public new string Text
{
    get { return base.Text; }
}

EditorBrowsable(EditorBrowsableState.Never) has no effect.

Dave
BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)
Visual Basic is not used by normal people so we're not covering it here. (Uncyclopedia)

Re: Custom properties for inherited button control

akamper16-Mar-09 21:33

akamper

16-Mar-09 21:33

Thanks a lot

I implemented it that way then.

But then occurs another question:
- I am not able to hide the "Desgin-Category" properties like (Name) and Locked.
and i couldn't find a solution on net, just some more asking for help Smile | :)

Is it possible to hide it, because the name is simply irrelevant in my application.

Thanks

Re: Custom properties for inherited button control

DaveyM6917-Mar-09 2:37

DaveyM69

17-Mar-09 2:37

No you can't. The Name property is just the name given to that particular instance of the class. Just like doing
TextBox textBox = new TextBox();
The Name of that particular instance is now textBox. It's extremely rare that the Name isn't needed.

For future reference, if you derive from System.ComponentModel.Component you don't get any of the superfluous properties, events or methods. You also get a Component not a Control though. Control derives from Component however so it may be possible to create your own Control class from Component with some work, that doesn't have the unecessary stuff. That would make a great article!

The Control class definition is

public class Control : Component, IDropTarget, ISynchronizeInvoke, IWin32Window, IBindableComponent, IComponent, IDisposable
{
    // ... loads of stuff here!
}

Dave
BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)
Visual Basic is not used by normal people so we're not covering it here. (Uncyclopedia)

Java vs .NET - Open Source

dataminers16-Mar-09 3:43

dataminers

16-Mar-09 3:43

Java is open source language. Microsoft .Net Framework is not open source. I can open Microsoft .Net dll files with using reflector. Example for Abs function in Net Framework;

mscorlib --> System --> Math --> Abs

public static int Abs(int value)
{
if (value >= 0)
{
return value;
}
return AbsHelper(value);
}

private static int AbsHelper(int value)
{
if (value == -2147483648)
{
throw new OverflowException(Environment.GetResourceString("Overflow_NegateTwosCompNum"));
}
return -value;
}

So I can see dll files code and I can modify it. Thus it became open source, will you?