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How to bind a listbox with a Class?

Posted on 2007-12-05
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Last Modified: 2013-11-07
Hi experts

i have a class with 2 properties
eg : Name and firstname

in my application this class is sent from business services and i have to add it to my listbox in the GUI

so when each time i'll receive the class (name and firstname) from business layer, i have to show in my listbox the FIRSTNAME and put in the item tag or wherever else the NAME to keep reference

the goal is when the user will double_click on the item, i can retrieve the NAME from the FIRSTNAME clicked

can you help me?

regards
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Question by:Dnx_7
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8 Comments
 
LVL 13

Accepted Solution

by:
Michael_D earned 125 total points
ID: 20411694
in your class override ToString method to return whatever you want to be shown in the list box
then Add the WHOLE object to the list box - you don't have to store refference in the Tag property.
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LVL 21

Expert Comment

by:surajguptha
ID: 20411706
listbox.DisplayMember = "FirstName";
listbox.ValueMember = "Name";
listbox.DataSource = class object returned from the web service

on click of the button
"listbox.SelectedValue" will give the name
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Author Comment

by:Dnx_7
ID: 20411755
doesn't work...

i got exception... and plus, i cannot use datasource because i have to keep the previous data...

it's like the business layer will send step by step

first notification
myApp <== business will send ("david", "nameOfDavid")

second notification
myApp <== business will send ("Henry", "nameOfHenry")

but i have to keep david from the first notification...

regards
 Dim pf As PluginFounded = DirectCast(e, PluginFounded)
            lb.DisplayMember = "Interface"
            lb.ValueMember = "Path"
            lb.DataSource = pf
    

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LVL 21

Expert Comment

by:surajguptha
ID: 20411814
We will work on the keeping previous data later. But what exception are you getting?
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LVL 13

Expert Comment

by:Michael_D
ID: 20411830
Dim p as Person = BusinessLayer.GetPerson

lb.Add(p)

......

in your DoubleClick event

Dim p as Person = DirectCast(lb.SelectedItem, Person)
...

Access all properties of selected person

Console.Write(p.FirstName)
Console.Write(p.Name)




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LVL 2

Author Comment

by:Dnx_7
ID: 20411840
that's ok, the Michael_D's solution is correct!

i didn't see it sorry

thank you to both of you !
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Author Closing Comment

by:Dnx_7
ID: 31412856
Excellent!
0
 
LVL 55

Expert Comment

by:Jaime Olivares
ID: 20411949
Michael_D suggestion is better, don't use data binding just add the entire object instead of a string:

class MyBusinessClass
{
     string Name;
     string FirstName;
 
     public override string ToString()
     {
            return FirstName;  // this is what you will see in listbox
     }
}

MyBusinessClass obj;  // fill it somewhere
listbox1.Items.Add(obj);   // add the entire object, not a string

// .... later

MyBusinessClass obj = (MyBusinessClass)listbox.SelectedItem;    // casting is required
MessageBox.Show(obj.Name);
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