C# Multiple Generic Parameters

Question

The code below uses a single generic parameter.

Is there a way to take multiple generic variables, where I want 2 or more classes? (eg, T1 class, T2 class, etc.)

Original generic:

public interface IGenericRepository<T> where T : class 
{
    IQueryable<T> GetAll();
    IQueryable<T> FindBy(Expression<Func<T, bool>> predicate);
    void Add(T entity);
    void Delete(T entity);
    void Edit(T entity);
    void Save();
}

Possible duplicate of Generic method with multiple constraints — Steve
– Steve, Commented May 28, 2018 at 23:56

Max von Hippel · Accepted Answer · 2018-05-29 02:00:41Z

7

Generics types can be anything, not just T - T just happens to be common.

Example:

void foo<TOne, TTwo>() 
   where TOne : BaseOne
   where TTwo : BaseTwo

More information can been seen here. Check out the "Constraining Multiple Parameters" section.

edited May 29, 2018 at 2:00

Max von Hippel

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answered May 28, 2018 at 23:57

acandylevey

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2 Comments

user8280126 Over a year ago

Can I also just use Class, instead of Base1, Base2, like this below? void foo<TOne, TTwo>() where TOne : class where TTwo : class

acandylevey Over a year ago

Yes, you can just use class to restrict to class types as per the table at the start of the linked article.

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