Ask a simple question about WindowForm

ihatesam530

Existing AForm, BForm, CForm three forms, A, B can call up C form
If used:
CForm frm = new CForm ();
frm.Owner = this;
frm.ShowDialog ();

In the C form, you can set the variables in A and B.
If used: AForm frm = (AForm) this.Owner;
      frm.x = 100;
Or: BForm frm = (BForm) this.Owner;
      frm.x = 100;

When the program is running, how does the CForm form know whether it is called AForm or BForm and return a value?

tianfeng

declare a property of type Form in CForm and assign a form to the property before calling CForm.ShowDialog

pizzasong

The easiest way ﹕
if (Type.GetType ("Test.AForm") == this.Owner.GetType ())
{
    ((AForm) this.Owner) .x = 100;
}
else
{
    ((BForm) this.Owner) .x = 100;
}

Note: Change the Test in "Test.AForm" to the namespace of your AForm class. It must not be omitted.

kalian2000

Agree upstairs ..

reflection:

using System.Reflection;

            if (Type.GetType ("TestForm.AForm"). Equals (this.Owner.GetType ()))
            {
                // Indicate that the parent form of this C form is A
                //operating
            }
            else
            {
                 // otherwise B
                 //operating
            }

imrukawa

top

119994745

Top one!

ak41sl

You can set a global variable. When A calls C, it assigns the variable A. When B calls C, it assigns the variable B.

Such as class FromA ()
{
    public string strparent = ""

    private void call C ()
    {
         strparent = "A";
         // u can call form c here;
     }
}

class FromB ()
{

    private void call C ()
    {
         FormA.strparent = "B";
         // u can call form c here;
     }
}

You know who called it by reading the value of FormA.strparent.

zly82112314

using System.Reflection;

                        if (Type.GetType( "TestForm.AForm ").Equals (this.Owner.GetType()))
                        {
                                //Description that the parent form of the C form is A
                                //Operation
                        }
                        else
                        {
                                  //Otherwise it is B
                                  //Operation
                        }