listbox showing class name

[Rotsey]

Hi,

I have a listbox and I am adding objects to it with AddRange.

The problem is the listbox just shows the name of object
class in every row and not the DisplayMember see below.

Any ideas??

void mWorker_Progres sChanged(object sender, ProgressChanged EventArgs e)

{

this.Text = string.Format(" Find Duplicates: {0} - {1}%",mDriveDat a.Drive,
e.ProgressPerce ntage);

toolStripProgre ssBar1.Value = e.ProgressPerce ntage;

List<DuplicateF ileNamefilelist = e.UserState as List<DuplicateF ileName>;

DuplicateFileNa me[] files = filelist.ToArra y();

listBox1.Items. AddRange(files) ;

listBox1.Displa yMember = "FileName";

listBox1.ValueM ember = "ID";

}

[Alex Meleta]

Hi Rotsey,

An object should have overrided .ToString() method to show what you need
or you should implement custom drawing (see DrawItem or such event)

Regards, Alex
[TechBlog] http://devkids.blogspot.com

Hi,

I have a listbox and I am adding objects to it with AddRange.

The problem is the listbox just shows the name of object class in
every row and not the DisplayMember see below.

Any ideas??

void mWorker_Progres sChanged(object sender, ProgressChanged EventArgs
e)

{

this.Text = string.Format(" Find Duplicates: {0} -
{1}%",mDriveDat a.Drive, e.ProgressPerce ntage);

toolStripProgre ssBar1.Value = e.ProgressPerce ntage;

List<DuplicateF ileNamefilelist = e.UserState as
List<DuplicateF ileName>;

DuplicateFileNa me[] files = filelist.ToArra y();

listBox1.Items. AddRange(files) ;

listBox1.Displa yMember = "FileName";

listBox1.ValueM ember = "ID";

}

[Morten Wennevik [C# MVP]]

Hi,

Make sure DuplicateFilesN ame has a "FileName" property, and not Filenameor any other spelling. If the listbox cannot find the property, it willrevert to default object.ToString (), and the default ToString implementation returns the class name.

Instead of doing filelist.ToArra y and listbox.AddRang e, you can simply do

listBox1.DataSo urce = filelist;
On Sun, 28 Oct 2007 12:59:04 +0100, Rotsey <ma***********@ RemoveThis.optu snet.com.auwrot e:

Hi,

I have a listbox and I am adding objects to it with AddRange.

The problem is the listbox just shows the name of object
class in every row and not the DisplayMember see below.

Any ideas??

void mWorker_Progres sChanged(object sender, ProgressChanged EventArgs e)

{

this.Text = string.Format(" Find Duplicates: {0} - {1}%",mDriveDat a.Drive,
e.ProgressPerce ntage);

toolStripProgre ssBar1.Value = e.ProgressPerce ntage;

List<DuplicateF ileNamefilelist = e.UserState as List<DuplicateF ileName>;

DuplicateFileNa me[] files = filelist.ToArra y();

listBox1.Items. AddRange(files) ;

listBox1.Displa yMember = "FileName";

listBox1.ValueM ember = "ID";

}

--
Happy coding!
Morten Wennevik [C# MVP]

[Rotsey]

The FileName property is spelled/cased correctly

You will notice that my ocde is in ProgressChnaged event
so the listox is to be filled incremently.

Using the DataSource property correctly uses the displaymenber/valuemember
properties.

So why doesn't AddRange work the same????


"Morten Wennevik [C# MVP]" <Mo************ @hotmail.comwro te in message
news:op.t0wvt3f qdj93y5@ubuan.. .
Hi,

Make sure DuplicateFilesN ame has a "FileName" property, and not Filename or
any other spelling. If the listbox cannot find the property, it will revert
to default object.ToString (), and the default ToString implementation
returns the class name.

Instead of doing filelist.ToArra y and listbox.AddRang e, you can simply do

listBox1.DataSo urce = filelist;
On Sun, 28 Oct 2007 12:59:04 +0100, Rotsey
<ma***********@ RemoveThis.optu snet.com.auwrot e:

Hi,

I have a listbox and I am adding objects to it with AddRange.

The problem is the listbox just shows the name of object
class in every row and not the DisplayMember see below.

Any ideas??

void mWorker_Progres sChanged(object sender, ProgressChanged EventArgs e)

{

this.Text = string.Format(" Find Duplicates: {0} - {1}%",mDriveDat a.Drive,
e.ProgressPerce ntage);

toolStripProgre ssBar1.Value = e.ProgressPerce ntage;

List<DuplicateF ileNamefilelist = e.UserState as List<DuplicateF ileName>;

DuplicateFileNa me[] files = filelist.ToArra y();

listBox1.Items. AddRange(files) ;

listBox1.Displa yMember = "FileName";

listBox1.ValueM ember = "ID";

}

--
Happy coding!
Morten Wennevik [C# MVP]

[Chris Shepherd]

Rotsey wrote:

The FileName property is spelled/cased correctly

You will notice that my ocde is in ProgressChnaged event
so the listox is to be filled incremently.

Using the DataSource property correctly uses the displaymenber/valuemember
properties.

So why doesn't AddRange work the same????

It does. There must be some other bug. See below.

When I load that form, I get a listbox with the words One, Two, Three,
and Four as the items in it. In .NET 2.0 it seems to work fine anyways.

Chris.
using System;
using System.Collecti ons.Generic;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows. Forms;

namespace ProofOfConcept
{
public class Form1 : Form
{

protected class InnerTestObject
{
private string someValue;

public InnerTestObject () : this("") { }

public InnerTestObject (string val)
{
this.someValue = val;
}

public string Jabberwocky
{
get { return this.someValue; }
set { this.someValue = value; }
}
}

public Form1()
{
InitializeCompo nent();
}

private void Form1_Load(obje ct sender, EventArgs e)
{
listBox1.Items. AddRange(new InnerTestObject[] {
new InnerTestObject ("One"),
new InnerTestObject ("Two"),
new InnerTestObject ("Three"),
new InnerTestObject ("Four")});

listBox1.Displa yMember = "Jabberwock y";
}

private ListBox listBox1;

/// <summary>
/// Required designer variable.
/// </summary>
private System.Componen tModel.IContain er components = null;

/// <summary>
/// Clean up any resources being used.
/// </summary>
/// <param name="disposing ">true if managed resources should be
disposed; otherwise, false.</param>
protected override void Dispose(bool disposing)
{
if (disposing && (components != null))
{
components.Disp ose();
}
base.Dispose(di sposing);
}

#region Windows Form Designer generated code

/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeCompo nent()
{
this.listBox1 = new System.Windows. Forms.ListBox() ;
this.SuspendLay out();
//
// listBox1
//
this.listBox1.F ormattingEnable d = true;
this.listBox1.L ocation = new System.Drawing. Point(12, 12);
this.listBox1.N ame = "listBox1";
this.listBox1.S ize = new System.Drawing. Size(120, 95);
this.listBox1.T abIndex = 0;
//
// Form1
//
this.AutoScaleD imensions = new System.Drawing. SizeF(6F, 13F);
this.AutoScaleM ode = System.Windows. Forms.AutoScale Mode.Font;
this.ClientSize = new System.Drawing. Size(251, 238);
this.Controls.A dd(this.listBox 1);
this.Name = "Form1";
this.Text = "Form1";
this.Load += new System.EventHan dler(this.Form1 _Load);
this.ResumeLayo ut(false);

}

#endregion

}
}