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Sep 8th, 2010

problem with listview

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Good Day ,
I have 2 windows forms (form_source and form_target) with listviews
(lstviewSource and lstviewTarget) respectively. When the items from
the "listviewSource" is selected it needs to be displayed on
"lstviewTarget".I am cloning the items from the listview in
"form_source" but it is not displaying on the listview on "form_target".

below is the code.... thanks in advance.

*****************************************************

method on form_target

C# Syntax (Toggle Plain Text)
public void CopySelectedItems(ListView _lstviewSource)
 
        {
            foreach (ListViewItem item in _lstviewSource.Items)
            {
                if (item.Checked)
                {
                  lstviewTarget.Items.Add((ListViewItem)item.Clone());
                }
            }
        }
public void CopySelectedItems(ListView _lstviewSource)

        {
            foreach (ListViewItem item in _lstviewSource.Items)
            {
                if (item.Checked)
                {
                  lstviewTarget.Items.Add((ListViewItem)item.Clone());
                }
            }
        }

******************************************************

method on form_source

C# Syntax (Toggle Plain Text)
private void btnAddImages_Click(object sender, EventArgs e)
 
        {
            form_target myform = new form_target();
            myform.CopySelectedItems(lstviewTarget);
            this.Close();
        }
private void btnAddImages_Click(object sender, EventArgs e)

        {
            form_target myform = new form_target();
            myform.CopySelectedItems(lstviewTarget);
            this.Close();
        }

******************************************************

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rico078

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Sep 8th, 2010

Re: problem with listview

Use item.Selected in place of item.Checked on "form_target"

C# Syntax (Toggle Plain Text)
public void CopySelectedItems(ListView _lstviewSource)
 
        {
            foreach (ListViewItem item in _lstviewSource.Items)
            {
                if (item.Selected )
                {
                  lstviewTarget.Items.Add((ListViewItem)item.Clone());
                }
            }
        }
public void CopySelectedItems(ListView _lstviewSource)

        {
            foreach (ListViewItem item in _lstviewSource.Items)
            {
                if (item.Selected )
                {
                  lstviewTarget.Items.Add((ListViewItem)item.Clone());
                }
            }
        }

And on source_form i think you miss a line
myform.show();

C# Syntax (Toggle Plain Text)
 
private void btnAddImages_Click(object sender, EventArgs e)
 
        {
            form_target myform = new form_target();
            myform.Show();
            myform.CopySelectedItems(lstviewTarget);
            this.Close();
        }
private void btnAddImages_Click(object sender, EventArgs e)

        {
            form_target myform = new form_target();
            myform.Show();
            myform.CopySelectedItems(lstviewTarget);
            this.Close();
        }

It will work
Best Of Luck.

prvnkmr449

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Sep 9th, 2010

Re: problem with listview

thanks for the reply , i have tried what you have suggested and it still does not work

rico078

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Sep 9th, 2010

Re: problem with listview

Quote originally posted by rico078 ...

I have 2 windows forms (form_source and form_target) with listviews
(lstviewSource and lstviewTarget) respectively. When the items from
the "listviewSource" is selected it needs to be displayed on
"lstviewTarget".I am cloning the items from the listview in
"form_source" but it is not displaying on the listview on "form_target".

You said that form_source has a listview called lstviewSource,
yet in your code for form_source you reference lstviewTarget.
myform.CopySelectedItems(lstviewTarget);
Is this where your problem is or is this just a typo.

nick.crane

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Sep 9th, 2010

Re: problem with listview

sorry , it is a typo , the code is "myform.CopySelectedItems(lstviewSource);"

rico078

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Sep 9th, 2010

Re: problem with listview

Click to Expand / Collapse Quote originally posted by prvnkmr449 ...

C# Syntax (Toggle Plain Text)
private void btnAddImages_Click(object sender, EventArgs e) {
    form_target myform = new form_target();
    myform.Show();
    myform.CopySelectedItems(lstviewTarget);
    this.Close();
}
private void btnAddImages_Click(object sender, EventArgs e) { form_target myform = new form_target(); myform.Show(); myform.CopySelectedItems(lstviewTarget); this.Close(); }
It will work

It will work if your goal is to briefly show the form then close it. myform is a local variable and thus will go out of scope as soon as this method ends. This will cause myform to immediately close.

You need to rethink your form handling.

Momerath

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Posting Sensei

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since Aug 2010

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Sep 9th, 2010

Re: problem with listview

I think your program is close and not give any output use this.hide() in place of this.close()
region is that when ever when ever program encounter this.close() it close hole program rather then closing a single may it because of it is your main form.............
Best Of Luck.

Last edited by prvnkmr449; Sep 9th, 2010 at 4:41 pm.

prvnkmr449

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Sep 10th, 2010

Re: problem with listview

Click to Expand / Collapse Quote originally posted by Momerath ...

It will work if your goal is to briefly show the form then close it. myform is a local variable and thus will go out of scope as soon as this method ends. This will cause myform to immediately close.

You need to rethink your form handling.

You would think that would be the case...and i believe it should be... but unless this.close is closing the main application form, the newly opened form will remain open.

When you call myform.Show() it is added to the Application.OpenForms collection. Thus when the method level variable that references the form goes out of scope it doesnt close because there is still a valid reference to it in the application. It will only be disposed and garbage collected when no references to it remain.
I still prefer not to call forms this way as it feels untidy to me to have forms floating around with no "anchoring" reference, but thats my personal feelings on the matter. I always use this.Hide when i want to move from one form to the next as this allows me the option to return and works if the form to be "hidden" is the application entry point.

Ryshad

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