CODEWITHSUNDEEP
c#asp.net.netdrop-down-menu
Tavousi
Tavousi

Reputation: 15486

Create a list from two different list

I have two lists. One list of Person and one list of Organization. I want to add these lists to each other and create a new list and then bind this list to a DropDownList. It is noteworthy that I want to add another property to this list that when I want to select an item from DropDownList, it give me this item is Person or Organization. How to I create this list?

Upvotes: 0

Views: 104

Answers (1)

Chris Sinclair
Chris Sinclair

Reputation: 23218

Rereading your question, perhaps you shouldn't use Zip (or perhaps there's a better way than what I'm about to post using it).

Create a separate class that can contain both, have it mark if it's a person or organization, then build a list of those:

public class PersonOrganizationEntry
{
    public Person Person { get; private set; }
    public Organization Organization { get; private set; }

    public PersonOrganizationType Type { get; private set; }

    public PersonOrganizationEntry(Person person)
    {
        this.Person = person;
        this.Type = PersonOrganizationType.Person;
    }

    public PersonOrganizationEntry(Organization organization)
    {
        this.Organization = organization;
        this.Type = PersonOrganizationType.Organization;
    }
}

public enum PersonOrganizationType
{
    Person,
    Organization
}

Then merge your lists together with this new type:

var persons = new List<Person>()
{
    new Person(),
    new Person(),
    new Person()
};

var organizations = new List<Organization>()
{
    new Organization(),
    new Organization()
};

var mergedEntries = 
        persons.Select(p => new PersonOrganizationEntry(p))
    .Concat(
        organizations.Select(o => new PersonOrganizationEntry(o))
    ).ToList();

Then you can bind your drop-down-list against this collection of PersonOrganizationEntry. Each "Person" entry will have an instance assigned to the entry's Person field and the Type will be PersonOrganizationType.Person. Vice-versa for organizations.

Upvotes: 1

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