listView question

[Vanessa]

With this program I can do one selection,
but upon the second I get an error where
///////////////// is indicated. Please help.

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
namespace WindowsApplication1
{
public class Form1 : System.Windows.Forms.Form
{
private System.Windows.Forms.TextBox textBox1;
private System.Windows.Forms.ColumnHeader columnHeader1;
private System.Windows.Forms.ColumnHeader columnHeader2;
private System.Windows.Forms.ListView listView1;
private System.ComponentModel.Container components = null;
public Form1()
{
InitializeComponent();
}
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
#region Windows Form Designer generated code
private void InitializeComponent()
{
this.textBox1 = new System.Windows.Forms.TextBox();
this.columnHeader1 = new System.Windows.Forms.ColumnHeader();
this.columnHeader2 = new System.Windows.Forms.ColumnHeader();
this.listView1 = new System.Windows.Forms.ListView();
this.SuspendLayout();
//
// textBox1
//
this.textBox1.Location = new System.Drawing.Point(16, 192);
this.textBox1.Name = "textBox1";
this.textBox1.Size = new System.Drawing.Size(256, 20);
this.textBox1.TabIndex = 1;
this.textBox1.Text = "";
//
// columnHeader1
//
this.columnHeader1.Text = "number";
this.columnHeader1.Width = 49;
//
// columnHeader2
//
this.columnHeader2.Text = "name";
this.columnHeader2.Width = 186;
//
// listView1
//
this.listView1.Columns.AddRange(new System.Windows.Forms.ColumnHeader[] {
this.columnHeader1,
this.columnHeader2});
this.listView1.GridLines = true;
this.listView1.LabelEdit = true;
this.listView1.Location = new System.Drawing.Point(24, 16);
this.listView1.Name = "listView1";
this.listView1.Size = new System.Drawing.Size(256, 160);
this.listView1.TabIndex = 0;
this.listView1.View = System.Windows.Forms.View.Details;
this.listView1.SelectedIndexChanged += new
System.EventHandler(this.listView1_SelectedIndexCh anged);
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(292, 266);
this.Controls.Add(this.textBox1);
this.Controls.Add(this.listView1);
this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedToolWind ow;
this.Name = "Form1";
this.ShowInTaskbar = false;
this.Text = "Form1";
this.Load += new System.EventHandler(this.Form1_Load);
this.ResumeLayout(false);
}
#endregion
[STAThread]
static void Main()
{
Application.Run(new Form1());
}
private void listView1_SelectedIndexChanged(object sender, EventArgs e)
{
ListView.SelectedListViewItemCollection contents =
this.listView1.SelectedItems;
textBox1.Text = contents[0].SubItems[1].Text;/////////////////////error
}
private void Form1_Load(object sender, System.EventArgs e)
{
string [ ] show0 = new string [] {"one","two","three","four"};
string [ ] show1 = new string [] {"ene","mene","mane","moo"};
for (int i = 0; i<show0.Length;i++)
{
ListViewItem listItem = new ListViewItem(show0[i]);
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
namespace WindowsApplication1
{
public class Form1 : System.Windows.Forms.Form
{
private System.Windows.Forms.TextBox textBox1;
private System.Windows.Forms.ColumnHeader columnHeader1;
private System.Windows.Forms.ColumnHeader columnHeader2;
private System.Windows.Forms.ListView listView1;
private System.ComponentModel.Container components = null;
public Form1()
{
InitializeComponent();
}
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
#region Windows Form Designer generated code
private void InitializeComponent()
{
this.textBox1 = new System.Windows.Forms.TextBox();
this.columnHeader1 = new System.Windows.Forms.ColumnHeader();
this.columnHeader2 = new System.Windows.Forms.ColumnHeader();
this.listView1 = new System.Windows.Forms.ListView();
this.SuspendLayout();
//
// textBox1
//
this.textBox1.Location = new System.Drawing.Point(16, 192);
this.textBox1.Name = "textBox1";
this.textBox1.Size = new System.Drawing.Size(256, 20);
this.textBox1.TabIndex = 1;
this.textBox1.Text = "";
//
// columnHeader1
//
this.columnHeader1.Text = "number";
this.columnHeader1.Width = 49;
//
// columnHeader2
//
this.columnHeader2.Text = "name";
this.columnHeader2.Width = 186;
//
// listView1
//
this.listView1.Columns.AddRange(new System.Windows.Forms.ColumnHeader[] {
this.columnHeader1,
this.columnHeader2});
this.listView1.GridLines = true;
this.listView1.LabelEdit = true;
this.listView1.Location = new System.Drawing.Point(24, 16);
this.listView1.Name = "listView1";
this.listView1.Size = new System.Drawing.Size(256, 160);
this.listView1.TabIndex = 0;
this.listView1.View = System.Windows.Forms.View.Details;
this.listView1.SelectedIndexChanged += new
System.EventHandler(this.listView1_SelectedIndexCh anged);
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(292, 266);
this.Controls.Add(this.textBox1);
this.Controls.Add(this.listView1);
this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedToolWind ow;
this.Name = "Form1";
this.ShowInTaskbar = false;
this.Text = "Form1";
this.Load += new System.EventHandler(this.Form1_Load);
this.ResumeLayout(false);
}
#endregion
[STAThread]
static void Main()
{
Application.Run(new Form1());
}
private void listView1_SelectedIndexChanged(object sender, EventArgs e)
{
ListView.SelectedListViewItemCollection contents =
this.listView1.SelectedItems;
textBox1.Text = contents[0].SubItems[1].Text;/////////////////////error
}
private void Form1_Load(object sender, System.EventArgs e)
{
string [ ] show0 = new string [] {"one","two","three","four"};
string [ ] show1 = new string [] {"ene","mene","mane","moo"};
for (int i = 0; i<show0.Length;i++)
{
ListViewItem listItem = new ListViewItem(show0[i]);
listItem.SubItems.Add(show1[i]);
listView1.Items.Add(listItem);
}
}
}
}
listItem.SubItems.Add(show1[i]);
listView1.Items.Add(listItem);
}
}
}
}

[Pete Beech]

The error is because an event is firing with nothing in the SelectedItems...
so trying to access contents[0] fails because there is nothing in contents.

Its a bit strange that there is an event fired with no selected items - it
seems that, when you click on a 2nd different item (without the shift key -
i.e. not making a multi selection), internally the listbox selection is
cleared, causing the event to fire with SelectedItems containing nothing,
before the 2nd item is added to the SelectedItems and the event is fired
again.

You should always protect against there being no selection anyway,
especially in a multiselect listbox - i.e. something like this:

if (contents.Count > 0)
textBox1.Text = contents[0].SubItems[1].Text;
else
textBox1.Text = "(Nothing)";
Cheers,
Pete Beech
"Vanessa" <va*****@hipperdy.hop> wrote in message
news:10***************@news-01.evisp.enertel.nl...

With this program I can do one selection,
but upon the second I get an error where
///////////////// is indicated. Please help.

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
namespace WindowsApplication1
{
public class Form1 : System.Windows.Forms.Form
{
private System.Windows.Forms.TextBox textBox1;
private System.Windows.Forms.ColumnHeader columnHeader1;
private System.Windows.Forms.ColumnHeader columnHeader2;
private System.Windows.Forms.ListView listView1;
private System.ComponentModel.Container components = null;
public Form1()
{
InitializeComponent();
}
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
#region Windows Form Designer generated code
private void InitializeComponent()
{
this.textBox1 = new System.Windows.Forms.TextBox();
this.columnHeader1 = new System.Windows.Forms.ColumnHeader();
this.columnHeader2 = new System.Windows.Forms.ColumnHeader();
this.listView1 = new System.Windows.Forms.ListView();
this.SuspendLayout();
//
// textBox1
//
this.textBox1.Location = new System.Drawing.Point(16, 192);
this.textBox1.Name = "textBox1";
this.textBox1.Size = new System.Drawing.Size(256, 20);
this.textBox1.TabIndex = 1;
this.textBox1.Text = "";
//
// columnHeader1
//
this.columnHeader1.Text = "number";
this.columnHeader1.Width = 49;
//
// columnHeader2
//
this.columnHeader2.Text = "name";
this.columnHeader2.Width = 186;
//
// listView1
//
this.listView1.Columns.AddRange(new System.Windows.Forms.ColumnHeader[] {
this.columnHeader1,
this.columnHeader2});
this.listView1.GridLines = true;
this.listView1.LabelEdit = true;
this.listView1.Location = new System.Drawing.Point(24, 16);
this.listView1.Name = "listView1";
this.listView1.Size = new System.Drawing.Size(256, 160);
this.listView1.TabIndex = 0;
this.listView1.View = System.Windows.Forms.View.Details;
this.listView1.SelectedIndexChanged += new
System.EventHandler(this.listView1_SelectedIndexCh anged);
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(292, 266);
this.Controls.Add(this.textBox1);
this.Controls.Add(this.listView1);
this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedToolWind ow; this.Name = "Form1";
this.ShowInTaskbar = false;
this.Text = "Form1";
this.Load += new System.EventHandler(this.Form1_Load);
this.ResumeLayout(false);
}
#endregion
[STAThread]
static void Main()
{
Application.Run(new Form1());
}
private void listView1_SelectedIndexChanged(object sender, EventArgs e)
{
ListView.SelectedListViewItemCollection contents =
this.listView1.SelectedItems;
textBox1.Text = contents[0].SubItems[1].Text;/////////////////////error
}
private void Form1_Load(object sender, System.EventArgs e)
{
string [ ] show0 = new string [] {"one","two","three","four"};
string [ ] show1 = new string [] {"ene","mene","mane","moo"};
for (int i = 0; i<show0.Length;i++)
{
ListViewItem listItem = new ListViewItem(show0[i]);
listItem.SubItems.Add(show1[i]);
listView1.Items.Add(listItem);
}
}
}
}

[Patrick de Ridder]

Thank you Pete,

Your suggestion solved that one.

Can you also input into a listView? I do not see a "Read Only = true/false"
in with the Properties.
"Pete Beech" <pe*********@hotmail.nojunk.com> wrote in message
news:un*************@TK2MSFTNGP12.phx.gbl...

You should always protect against there being no selection anyway,
especially in a multiselect listbox - i.e. something like this:

if (contents.Count > 0)
textBox1.Text = contents[0].SubItems[1].Text;
else
textBox1.Text = "(Nothing)";

[Pete Beech]

Setting LabelEdit to true allows the first column (the 'label') to be
edited. (In the example, LabelEdit is set to true.) To edit, you can single
click an item that is already selected.

"Patrick de Ridder" <se***@freeler.nl> wrote in message
news:10***************@news-01.evisp.enertel.nl...

Thank you Pete,

Your suggestion solved that one.

Can you also input into a listView? I do not see a "Read Only = true/false" in with the Properties.
"Pete Beech" <pe*********@hotmail.nojunk.com> wrote in message
news:un*************@TK2MSFTNGP12.phx.gbl...

You should always protect against there being no selection anyway,
especially in a multiselect listbox - i.e. something like this:

if (contents.Count > 0)
textBox1.Text = contents[0].SubItems[1].Text;
else
textBox1.Text = "(Nothing)";

[Vanessa]

What about the second column? Can't be done?

"Pete Beech" <pe*********@hotmail.nojunk.com> wrote in message
news:eG**************@tk2msftngp13.phx.gbl...

Setting LabelEdit to true allows the first column (the 'label') to be
edited. (In the example, LabelEdit is set to true.) To edit, you can single click an item that is already selected.

[Pete Beech]

Not as far as I can see, but I have never looked into it before.

Pete

"Vanessa" <no*******@all.here> wrote in message
news:10***************@news-01.evisp.enertel.nl...

What about the second column? Can't be done?

"Pete Beech" <pe*********@hotmail.nojunk.com> wrote in message
news:eG**************@tk2msftngp13.phx.gbl...

Setting LabelEdit to true allows the first column (the 'label') to be
edited. (In the example, LabelEdit is set to true.) To edit, you can

single

click an item that is already selected.

[Vanessa]

Pete,
Thanks for responding. Guess it cannot be done.
Don't see much use for just being able to edit
the first column and not the orthers.

"Pete Beech" <pe*********@hotmail.nojunk.com> wrote in message
news:%2****************@TK2MSFTNGP12.phx.gbl...

Not as far as I can see, but I have never looked into it before.

Pete

"Vanessa" <no*******@all.here> wrote in message
news:10***************@news-01.evisp.enertel.nl...

What about the second column? Can't be done?

"Pete Beech" <pe*********@hotmail.nojunk.com> wrote in message
news:eG**************@tk2msftngp13.phx.gbl...

Setting LabelEdit to true allows the first column (the 'label') to be
edited. (In the example, LabelEdit is set to true.) To edit, you can

single

click an item that is already selected.