Can you call a class' method when you declare the object?

Question

I have a class, where I declare it, but that class gets added as an item to another bigger class. Is there a way to call the Init() method in the same statement as the call? Similar to defining public properties/variables when you call the constructor. I don't want to call the Init() method in the constructor because it messes with the WPF Designer.

 FitsView fv = new FitsView();
 fv.Init();

score 4 · Accepted Answer · answered Dec 05 '12 at 20:50

4

You could use a static function to do that:

public static FitsView CreateFitsView()
{
    var fv = new FitsView();
    fv.Init();
    return fv;
}

Then you simply call that static function instead of new FitsView()

answered Dec 05 '12 at 20:50

Jon B

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score 0 · Answer 2 · answered Dec 05 '12 at 20:52

0

You could also try hooking a custom event to your FitsView if it knows when it's ready to be initialized?

And use it like this:

FitsView fv = new FitsView();
fv.someCustomEvent += (o,e) => { fv.Init(); };

answered Dec 05 '12 at 20:52

Joe

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Trisped · Answer 3 · 2012-12-05T22:48:40.613

0

Similar to the StringBuilder.Append you could alter Init to return a reference to the object.

Public FitsView Init()
{
    //Do stuff

    return this;
}

Then:

FitsView fv = new FitsView().Init();

edited Dec 05 '12 at 22:48

answered Dec 05 '12 at 20:53

Trisped

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score 0 · Answer 4 · edited May 23 '17 at 12:29

If the designer gets problematic because of your init method there are two reasons I can think of:

It is because something you do in Init method needs locality of your application (reading resources or files or using hardware)
Calling your Init method needs some external assemblies to be loaded dynamically.

For the first matter you may want to check:

For your class: Is there a DesignMode property in WPF?
For your view model: http://blog.laranjee.com/how-to-get-design-mode-property-in-wpf/

Also people in here pointed out this bug so please beware (hosting wpf in winforms): https://connect.microsoft.com/VisualStudio/feedback/details/620001/system-componentmodel-designerproperties-getisindesignmode-does-not-work-if-the-wpf-is-hosted-on-a-winform#tabs

For the second matter you can wrap your Init method in another let's say InitWrapper and do your design mode check for wrapper method.

Can you call a class' method when you declare the object?

4 Answers4