CODEWITHSUNDEEP
c#
Jimmyt1988
Jimmyt1988

Reputation: 21176

Template for IEnumerable properties?

Is there a way to template this class so that I can have a generic ListViewModel that can store IEnumerable<Whatever>. So instead of the following:

public class JamesListViewModel
{
    public IEnumerable<James> Jamess { get; set; }
    public PagingInfo PagingInfo { get; set; }
}

I would have:

public class ListViewModel
{
    public IEnumerable<T> Items { get; set; }
    public PagingInfo PagingInfo { get; set; }
}

Otherwise for every list page that has pagination etc, i'm going to have to create a new view model. And more so, If I could get the latter to work. I could inherit and refine if needs be for a specific view.

Upvotes: 2

Views: 92

Answers (2)

Alexander R
Alexander R

Reputation: 2476

You need to make the class generic:

public class ListViewModel<T>
{
    public IEnumerable<T> Items { get; set; }
    public PagingInfo PagingInfo { get; set; }
}

Then, an instance can be created by supplying the type parameter like so:

var vm = new ListViewModel<string>();

Multiple type parameters can be separated by commas:

public class ListViewModel<T, U>
{
    public IEnumerable<T> Items { get; set; }
    public IEnumerable<U> OtherItems { get; set; }
    public PagingInfo PagingInfo { get; set; }
}

var vm = new ListViewModel<string, int>();

See this guide for more information.

Upvotes: 4

Matthew Watson
Matthew Watson

Reputation: 109792

Just do this:

public class ListViewModel<T>
{
    public IEnumerable<T> Items { get; set; }
    public PagingInfo PagingInfo { get; set; }
}

See the MSDN documentation for full details:

http://msdn.microsoft.com/en-us/library/sz6zd40f.aspx

Upvotes: 2

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