将列表绑定到comboBox

Question

I have a List of Person objects (which is loaded from the database), I call it PersonList . Person class has four attributes Person_Id(PK) , Name , Family and Address .

I want to bind the context of this list to a ComboBox . Also I want to show both Name and Family of each person in ComboBox (not the Person_Id or Address ). On the other hand I want to gain Person_Id(PK) of the selected value of ComboBox if the end user selects anyone.

How can I manage to do this? Also I'm wondering if I delete any items of PersonList the ComboBox updates automatically or I Should update manually by myself?

Answer 1

Add to your Person class a readonly property that returns the string desired

class Person
{
    public int Person_ID {get;set;}
    public string name {get;set;}
    public string family {get;set;}
    public int address {get;set;}
    public string name_family { get {return this.ToString();}}

    public override string ToString()
    {
        return string.Format("{0} {1}", this.name, this.family);
    }
}

now assign the property DisplayMember of the combobox to the read only property and the ValueMember property to the Person_ID of the class Person.

comboBox1.DataSource = PersonList;
comboBox1.DisplayMember = "name_family";
comboBox1.ValueMember = "id";

Now in the combobox SelectedIndexChange event you could retrieve the ID from the SelectedItemValue

private void comboBox1_SelectedIndexChanged(object sender, System.EventArgs e)
{
    if(comboBox1.SelectedValue != null)
    {
       int personID = Convert.ToInt32(comboBox1.SelectedValue);
       .......
    }
}