Passing List to form and back... Help plz.

JollyMansArt

I am sort of stumpped. I have a List EmailsTO List EmailsCC I want to be able to pass the lists into a form. Modify those lists in the form. Then return the new lists back to the Parrent form, followed by closing of the child form I am simulating as a popup. I can not figure out how to get the list ... into the form and back out. Can someone help point me in the right direction? Here is some of what I have come up with....

using (frmpopupEmailRecipient popupVerifyEmailRecipients = new frmpopupEmailRecipient(ref EmailTo, ref EmailCC))
{
// passing this in ShowDialog will set the .Owner
// property of the child form
popupVerifyEmailRecipients.ShowDialog(this);
}

JollyMansArt

What I still can not figure out is passing a ref into the form is great for 1 way population if information. But What I need is to be able to receive a list back to the parrent replacing the list the parrent currently has with the modified list of the child. I keep thinking I need to set up a List Property on the child form. But I can not find any examples on how to set up a list Property. Please Help.

Christian Graus

Don't pass controls around. Pass the data around. Use delegates to pass changes back to the main form.

Christian Graus Driven to the arms of OSX by Vista. Read my blog to find out how I've worked around bugs in Microsoft tools and frameworks.

JollyMansArt

Please explain. I don't understand what you mean by passing delegates? ok kinda Understand delegates purposes and I agree that should be the answer to my problem. but I am not understanding an example where I can pass List between parrent and child forms... http://www.c-sharpcorner.com/UploadFile/mosessaur/winformsdelegates09042006094826AM/winformsdelegates.aspx[^]

modified on Tuesday, October 20, 2009 7:16 PM

Christian Graus · modified on Tuesday, October 20, 2009 7:16 PM

JollyMansArt wrote:

but I am not understanding an example where I can pass List between parrent and child forms...

DON'T pass a list control between your forms. Pass the list itself ( I don't know if that's what you mean by list ). Pass it into the form, then if the form is modal, you can just access it back out with a property. If the form is modeless, a delegate is needed to tell the main form when data was changed inside the other form ( assuming this is possible )

Christian Graus Driven to the arms of OSX by Vista. Read my blog to find out how I've worked around bugs in Microsoft tools and frameworks.

JollyMansArt

I am not passing a control I am passing a List ABC Object which is sort of like string[].tolist() I agree with what your saying and I just thought of that to. Now I just have to remember how to do that. I have avoided interform communication methods in the past. Now it is time to figure out how to do it again. Your right though.. Encapsulating the new form in a using statement in a previous project did allow me to communicate with it from the parrent form. I just forget how to do that. I will research. Unless you have a sample. I am close in my code example i think.

Luc Pattyn

Hi, I assume this is about System.Net.Mail.MailMessage, which has three properties (To, Cc, Bcc) of type MailAddressCollection. you can pass such lists just like any other object, and it does not need a ref keyword; and the receiving method can enumerate, add, remove, and perform all operations that the list supports. The one thing you cannot do is replace the list by a different list (that is the only operation that would require you to use the ref keyword). :)

Luc Pattyn

I only read code that is properly indented, and rendered in a non-proportional font; hint: use PRE tags in forum messages

Local announcement (Antwerp region): Lange Wapper? 59.24% waren verstandig genoeg om NEEN te stemmen; bye bye viaduct.

JollyMansArt

Partial assumption is correct..... This is the mailmessage as to what it will go to. That part of the application I have working. I am tweaking the (to,cc,bc) before I pass the parameter to the procedure handling the list. To allow for the ability for a popup window with 2 checkbox list boxes. To allow the end user to override or add to the list of email addresses the will be used to send the autogenerated email. It was a requirement being asked in the last second. So I need to pass the 2 list variables into the popup form, allow the form to add/delete items from the list variable for the (to,cc,bc) email addresses. Then finally pass the new list objects back to the parent, replacing the parents list variables from the list variables received from the child.

JollyMansArt

Here is some of the code behind what I am doing before:

private void SendEmail(string AlertType, string Subject, string MessageBody)
{
string[] MailTo;
string[] MailCC;
string MailFrom = "it@peerassistllc.com";
List<string> EmailToAddress = EmailTo(AlertType);
List<string> EmailCCAddress = EmailCC(AlertType);

        if (EmailToAddress.Count > 0)
        {
            MailTo = EmailToAddress.ToArray<string>();
            MailCC = EmailCCAddress.ToArray<string>();
        }
        else
        {
            MailTo = EmailCCAddress.ToArray<string>();
            EmailCCAddress.Clear();
            MailCC = EmailCCAddress.ToArray<string>();
        }
        //string Subject = txtAppName.Text + " " + txtVerNumber.Text + " (" + txtCompanyName.Text + ") ";
        //string MessageBody = Subject + "\\r\\n " + DateTime.Now.ToString();
        string smtpHOST = txtSMTPServer.Text;
        int smtpPORT = Convert.ToInt32(txtsmtpPortNumber.Text);
        string smtpNETAuthUser = txtsmtpServerAuthencationUserName.Text;
        string smtpNETAuthPassword = txtsmtpServerAuthencationPassword.Text;
        int i = 0;

        string LogMessage = "Mail From: " + MailFrom;
        if (MailTo.Length > 0)
        {
            LogMessage += "    Mail To: ";
            for (i = 0; i < MailTo.Length; i++)
            {
                LogMessage += MailTo\[i\] + "; ";
            }
        }

        //MessageBox.Show(MailCC.Count<string>().ToString());
        //if (MailCC.Length > 0)
        if (MailCC.Count<string>() > 0)
        {
            LogMessage += "    Mail CC: ";
            for (i = 0; i < MailCC.Length; i++)
            {
                LogMessage += MailCC\[i\] + "; ";
            }
        }
        LogMessage += "     SMTP Host Server: " + txtSMTPServer.Text;
        LogMessage += "     SMTP Server Port: " + txtsmtpPortNumber.Text;
        LogMessage += "     SMTP Server UserName Authencation: " + txtsmtpServerAuthencationUserName.Text;
        LogMessage += "     Message Subject: " + Subject;
        
        //send to sql server;
        StandardProcedures.SQL\_Log(WhatIsMyConnectionString, AlertType, LogMessage, true);
        StandardP

JollyMansArt

Here is the Code I am trying to get to work to pass the variable to pass between the parent and child...

private void ConfirmEmailReceipents(ref List<string> EmailTo, ref List<string> EmailCC)
{

        using (frmpopupEmailRecipient popupVerifyEmailRecipients = new frmpopupEmailRecipient(ref EmailTo, ref EmailCC))
        {
            // passing this in ShowDialog will set the .Owner 
            // property of the child form
            //popupVerifyEmailRecipients
            popupVerifyEmailRecipients.ShowDialog(this);
        }
       using ( frmpopupEmailRecipient f2 = new frmpopupEmailRecipient())
        {
            if( f2.Show() == DialogResult.OK )
            {
                f2.toEMAIL;
                f2.ccEMAIL;

                int i = f2.Number1;
                string s = f2.String1;
            }
        }


    }

JollyMansArt

The ConfirmEmailReceipents is the process I need to work in passing my list to the child then back to the parrent to allow for modifications. Any Suggestions...

Luc Pattyn

JollyMansArt wrote:

allow the form to add/delete items from the list variable for the (to,cc,bc) email addresses. Then finally pass the new list objects ...

That is wrong, when you add/delete to a list (which is an object) it still is the same list (i.e. the same object, the difference is it may contain some other items). For the rest, I'm not going to study all that, it is way too much code for anything you may want to do. And AFAIK some of it will not even compile. :)

Luc Pattyn

I only read code that is properly indented, and rendered in a non-proportional font; hint: use PRE tags in forum messages

Local announcement (Antwerp region): Lange Wapper? 59.24% waren verstandig genoeg om NEEN te stemmen; bye bye viaduct.

JollyMansArt

I think I might of figured out how to pass the list to the child form. By Adding a Public List in the child form. WOrking on testing that But now I have a somewhat new question.... How do I have the child form return the result of Dialogbox.ok? I have set the child form's ok and cancel button's dialog property to the ok and cancel property. But I am unsure how to pass that to the parent form.

JollyMansArt

I figured out finally how to pass the array to the child and back... Parrent Form:

using (frmpopupEmailRecipient popupVerifyEmailRecipients = new frmpopupEmailRecipient())
{
popupVerifyEmailRecipients.MyEmailTo = EmailTo;
popupVerifyEmailRecipients.MyEmailCC = EmailCC;

            if (popupVerifyEmailRecipients.Show() == DialogResult.OK) //How to do this?
            {
                
            }

            EmailTo = popupVerifyEmailRecipients.MyEmailTo;
            EmailCC = popupVerifyEmailRecipients.MyEmailCC;

        }

Child Form:

public partial class frmpopupEmailRecipient : Form
{
public List<String> MyEmailTo;
public List<String> MyEmailCC
}

Now optionally I would like for learning instead of just closing the frm... How do I modify the child form to return a dialogresult.ok value?

Luc Pattyn

A Control (a Form IS a Control) offers the following methods amongst others:

public void Show()
public DialogResult ShowDialog()

and the MSDN page on ShowDialog clearly explains how the return value is determined. :|

Luc Pattyn

I only read code that is properly indented, and rendered in a non-proportional font; hint: use PRE tags in forum messages

Local announcement (Antwerp region): Lange Wapper? 59.24% waren verstandig genoeg om NEEN te stemmen; bye bye viaduct.