C # WeifenLuo.WinFormsUI.Docking.dll application problem subset form Access parent form method

The parent form content that needs to be obtained in the subform method as

Checkformisopen

PrivateFrmmenu Frmmenu =NewFrmmenu ();  PublicFrmmain () {InitializeComponent (); }        Private voidFrmmain_load (Objectsender, EventArgs e) {FRMMENU.P_FM= This; Frmmenu.show ( This. Dockpanelmain); }                      Public BOOLCheckformisopen (stringformname) {            BOOLRemark =false;  for(intA =0; A <Base. Mdichildren.length; a++)            {                if(FormName. Equals (Base. Mdichildren[a]. GetType (). Namespace +"."+Base. Mdichildren[a]. GetType (). Name)) {Base. Mdichildren[a].                    Activate (); Remark=true; }            }            returnremark; }

Subform:

usingSystem;usingSystem.Collections.Generic;usingSystem.ComponentModel;usingSystem.Data;usingSystem.Drawing;usingSystem.Text;usingSystem.Windows.Forms;usingWeifenLuo.WinFormsUI.Docking;namespacee24tt{ Public Partial classfrmmenu:dockcontent { PublicFrmmenu () {InitializeComponent (); }        //formsub:        Privatefrmmain FM;  Publicfrmmain p_fm {Get{returnFM;} Set{fm =value;} }        Private voidFrmmenu_load (Objectsender, EventArgs e)        {Trvmenu.expandall (); }        Private voidTrvmenu_afterselect (Objectsender, TreeViewEventArgs e) {            Try            {                //formsub://when it is necessary to refresh its caller (parent)                                   if( This. trvMenu.SelectedNode.Text! =NULL)                {                    if( This. trvMenu.SelectedNode.Tag! =NULL)                    {                        stringFormName = This. trvMenu.SelectedNode.Tag.ToString (); if(!FM. Checkformisopen (FormName)) {FM.                        Openchildform (FormName); }}} FM. Text="the 24TT setting"+ This. TrvMenu.SelectedNode.Text; }            Catch { }        }    }}

This method solves the problem of parent-child form passing value

Attribute method
Formfather:
Need to have a public refresh method
public void Refresh_method ()
{
//...
}
When called
Formsub F2 = new Formsub ();
F2. P_F1 = this; Emphasis, assigning values to the subform corresponding property
F2. Show ();

Formsub:
Private Formfather p_f1;
Public Formfather p_f1
{
Get{return p_f1;}
SET{P_F1 = value;}
}
When refreshed
P_f1. Refresh_method ();

C # WeifenLuo.WinFormsUI.Docking.dll application problem subset form Access parent form method