How to find that Form is loaded or the UserControl c#

Question

I am using a winform application c#. In the application we are using Lots of UserControls and Forms.

I have a parent form, where I am using UserControl as a MainDashBoard. But for other business requirements using Forms as well. On the userControl there is a button called LoadProperties, which will load another form displaying some properties of some object.

What I want to know is that how can I find out that currently active control is UserControl or Form. Because when I am pressing the button and saying

Form1 form = new Form1();
form.MDIParent= this;
form.show();

It is loading the form, but the this.ActiveControl is giving me the button as an active control not the form.

I want to get the currently loaded form how can I do this.

Can anybody help me out...here.

Regards Shax.

Answer 1

Every form has an ActiveControl, the control that will get the focus when the form is activated. To get the active form you should use the static Form.ActiveForm property.

Answer 2

Sorry I dont quite understand.

For finding out which MDI child is active use:

Form activeChild = this.ActiveMdiChild;

If you need to check what type of object an object is you can use:

if([variable] is Form)
{
}

if([variable] is Button)
{
}

Answer 3

只要保持对所有打开的表单的引用即可。