Passing startup parameters to child from MDI parent

First time using Multiple Document Interface Windows forms.    

How does one pass startup parameters from the parent?  
Including a URL with examples would be gratefully accepted.

Thank you.
LVL 1
RichardKlineAsked:
Who is Participating?
 
John (Yiannis) ToutountzoglouInstructor Multiengine PilotCommented:
if you need to pass parameters form one form to another even if it is MDI parent ,Child you can use the following:
1.using directCast like
Dim f As Form2 = DirectCast(Me.MdiParent, Form2)
f.Text = ...
2.Using Public Variables
3.Or...
'Below the public Class...

Private _passedText As String

    Public Property [PassedText]() As String
        Get
            Return _passedText
        End Get
        Set(ByVal Value As String)
            _passedText = Value
        End Set
    End Property


'so you have label text named LAbel1

Before you open the child set
PassedText=me.label1.text
'....then When you open then child try (let's say in toolstrip Button)
            Dim ChildForm As New Form   'or an existing form 
            ChildForm = FormWindowState.Normal
            ChildForm.MdiParent = Me
'Then in a label control in chikd Form (Named ChildLabel)
            ChildLabel.Text=PassedText   'And there you go

Open in new window

0
 
ghayasurrehmanCommented:
Create new constructors, eg. the code is for a sub form
public class subForm
{
string m_param1;

public subForm()
{
    InitializeComponents();
}

public subForm(string param1)
{
     this.m_param1 = param1;
    InitializeComponents();
}


}

Open in new window

0
 
RichardKlineAuthor Commented:
Going to be stupid about this. Converting this to vb.net, I have the SUBFORM code below which seems very reasonable.. But how do I code the parent?  

Thank you.

PARENT (does not work).
        Dim NewChild As subform = New subform("thisParameter")
        With NewChild
            .MdiParent = Me
            .Show()
        End With

SUBFORM
Public Class subform
    Private m_param1 As String

    Private Sub subform_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
    End Sub

    Public Sub subform()
        InitializeComponent()
    End Sub

    Public Sub subform(ByVal param1 As String)
        Me.m_param1 = param1
        InitializeComponent()
    End Sub

End Class
0
Cloud Class® Course: Microsoft Azure 2017

Azure has a changed a lot since it was originally introduce by adding new services and features. Do you know everything you need to about Azure? This course will teach you about the Azure App Service, monitoring and application insights, DevOps, and Team Services.

 
ghayasurrehmanCommented:
what is the error?
have you set parent midcontainer property = true ?
0
 
ghayasurrehmanCommented:
or change the constructor as follows
Public Sub subform(ByVal param1 As String)
        InitializeComponent()
        Me.m_param1 = param1
End Sub

Open in new window

0
 
RichardKlineAuthor Commented:
Sorry that I could not respond earlier.
ghayasurrehman, Error = VS 2010's Intellisense objected with an "unknown constructor" error.  But this parent code works fine with the subForm code as you presented it.
        Dim NewChild As subform = New subform()
        With NewChild
            .subform("ThisParameter")
            .MdiParent = Me
            .Show()
        End With
*************
jtoutou,
Very Cool.  I knew that you could directcast to/from a child form's element (label, textbox) but that was much too limiting.   Never thought about using Public Properties.  

Thank you, Both!
0
 
John (Yiannis) ToutountzoglouInstructor Multiengine PilotCommented:
Very Welcome...
0
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

All Courses

From novice to tech pro — start learning today.