Class Declaration in C#

Question

I was searching for reusable Grid for MVC .Net. I found one open source Grid.

In the code I found a pretty interesting class declaration which I didn't understand . Can anybody tell me a detailed description of class declaration below:

public class Grid<TEntity, TSearchForm> : IGrid where  TSearchForm : SearchForm, new()
{
}

Also how do I create an instance of this class?

Answer 1

This is generic class inherited from IGrid with two parameters: TEntity, TSearchForm.

Also there is a constraint on type of TSearchForm:

1. it must be of type SearchForm or below it in hierarchy (able to cast to SearchForm implicitly)

2. TSearchForm must have public parameterless constructor.

More info:

where (generic type constraint new Constraint

Answer 2

The class is a generic class, it implements IGrid.

The two generic type parameters are TEntity and TSearchForm.

TSearchForm is constrained to be SearchForm or a type that inherits from SearchForm and that it has a default constructor.

Suggested reading:

• Generics
• Constraints on Type Parameters

Answer 3

• Grid class implements IGrids interface.
• TSearchFormType must be of type SearchForm (by derivation)
• TSeachForm must have a constructor without parameters