CODEWITHSUNDEEP
c#listbox
Willem T
Willem T

Reputation: 104

id's and object names listbox

I have a listbox that i want to populate with contactpersoon objects that i created. The user completes a little form with a few textfields and when the user presses the ok button the contactpersoon object will be created.

The problem is now that i want to add the name property of the contactpersoon object to the listbox as an item. but when i want to delete it from the listbox i want to delete it by the id property of the object not the name property...

Can anyone help me with this. I tried using dictonaries but i didn't get them to work properly.

Can anyone please advise/help me with this?

Thank you very much..

BTW Iam sorry for my bad englisch :p

Upvotes: 2

Views: 5693

Answers (3)

Angshuman Agarwal
Angshuman Agarwal

Reputation: 4866

While Binding to ListBox, use this - 

listbox.DisplayMember = "name";
listbox.ValueMember = "id";

You can store the ID as a hidden value like this.

Upvotes: 3

LarsTech
LarsTech

Reputation: 81655

Try overriding the ToString() function of your ContactPerson class and add the whole object to the ListBox, not just the name. The ListBox.Items is a collection of objects, not just strings. The ToString() is used by the ListBox control to display the text value of the object.

Alternatively, you can create a List<contactperson> and use that as a DataSource, and just set the DisplayMember and ValueMember fields of the ListBox. DisplayMember would be the visible name, the ValueMember would be the ID field.

Upvotes: 1

Steven Doggart
Steven Doggart

Reputation: 43743

You need to override the ToString method in the ContactPerson class. For instance:

public class ContactPerson
{
    public string Name;
    public string Id;

    public override string ToString()
    {
        return Name;
    }
}

Then, you can add the actual ContactPerson objects to your list box. For instance:

listbox.Items.Add(contactPerson);

Then, when you delete, you can loop through each item in the list and read any of the properties of the ContactPerson object, such as:

foreach(object item in listbox.Items)
{
    if((ContactPerson)item.Id == ...)
    {
        // do work
    }
}

Upvotes: 2

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