I have a ChildFormDialog control on a form, and have set up the ChildForm and BO Translations for it.  The child form is coming from a dll and is an inherited form.  In my code I call ChildFormBank.ShowDialog() and get the attached error message every time.

I have included the stack trace for more info.

11/2/2006 9:35:32 AM
Source: mscorlib
Message: Value cannot be null.
Parameter name: type
Stack:    at System.Activator.CreateInstance(Type type, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes)
   at System.Activator.CreateInstance(Type type, Object[] args)
   at MicroFour.StrataFrame.UI.Windows.Forms.ChildFormDialog.CreateForm(Object[] Arguments)
   at MicroFour.StrataFrame.UI.Windows.Forms.ChildFormDialog.ShowDialog(Object[] Arguments)
   at MicroFour.StrataFrame.UI.Windows.Forms.ChildFormDialog.ShowDialog()
   at BBS.GUI.frmClientInfo.MaintBankRel_AfterButtonClick() in C:\FactorSoftV3\GUI\ClientInfo\frmClientInfo.vb:line 205
   at BBS.GUI.BaseControls.MaintStrip.button_Click(Object sender, EventArgs e)
   at System.Windows.Forms.Control.OnClick(EventArgs e)
   at DevExpress.XtraEditors.BaseButton.OnClick(EventArgs e)
   at DevExpress.XtraEditors.BaseButton.OnMouseUp(MouseEventArgs e)
   at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at DevExpress.Utils.Controls.ControlBase.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

 

If you didn't want to pass all of your parameters as an object[], then you'll want to change your constructor so that it does not expect an object, but just 3 regular parameters.  Then, you can remove the outer object from the CreateInstance() call.

Hi,

Thank you tip.

I will try it out later.







I don't think ChildFormDialog support this, doesn it?



Thank you

Yep, the ChildFormDialog is designed to work like that.  If your form is like this:

public class Form1 : System.Windows.Forms.Form
{
    public Form1(string param1, string param2, string param3) { }
}

Then you're call to childFormDialog.ShowDialog() will look like this:

childFormDialog.ShowDialog("param1", "param2", "param3");

The signature of the method is like this:

public DialogResult ShowDialog(params object[] parameters) {}

The keyword being the "params" at the beginning.  It means that you can add as many parameters as you want and separate them with commas and the compiler will pass them all as one big object array.  It's smart like that