CODEWITHSUNDEEP
c#winforms
Elegiac
Elegiac

Reputation: 366

if condition for MDI Parent Control

i have an mdi parent and mdi child and i want to know if what condition should i put to call the right class for this .

senario was i got a button in mdi parent (selectall) then i want to use that button for the active mdi child .

lets say:

private void iSelectAll_ItemClick(object sender,  e)
        {
            Form DtexteditoR = new DtexteditoR();
            //DtexteditoR.Show();

            if (DtexteditoR.MdiChild == true)
            {
                    rtb.SelectAll();
            }

        }

but a error

Operator == cannot be applied to operands of type 'System.Windows.Forms.Form' and 'bool'

appears ... what should i do?

Upvotes: 0

Views: 532

Answers (2)

mojtaba
mojtaba

Reputation: 339

write a form class that inherited from Form class and implement following method( MasterForm) : method in master form class of childs : selectAll

public class  MasterForm:Form
{
public virtual void SelectAll()
{
}
}

each child form must inhertated from MasterForm and override SelectAll Method

public class Child1:MasterForm
{
public override void SelectAll()
{
    this.rtb.SelectAll();
 }
}

in parent form in button click body

if(this.ActiveMdiChild!=null)
{
        MasterForm frm =(MasterForm) this.ActiveMdiChild;     
      frm.SelectAll();
}

Upvotes: 0

Habib
Habib

Reputation: 223362

You need Form.IsMdiChild to check if the form is Mdi Child.

Gets a value indicating whether the form is a multiple-document interface (MDI) child form.

private void iSelectAll_ItemClick(object sender,  e)
{
    Form DtexteditoR = new DtexteditoR();
    //DtexteditoR.Show();

    if (DtexteditoR.IsMdiChild)
    {
            rtb.SelectAll();
    }

}

To check for MdiContainer use Form.IsMdiContainer Property

Upvotes: 3

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