What does new() mean in this context [duplicate]

This question already has answers h开发者_如何学运维ere: What does new() mean? (3 answers) Closed 10 months ago.

What does new() mean in the following context:

 public interface ISpecification<TEntity>
        where TEntity : class,new()

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It is a constraint on the type parameter TEntity that specifies that it must have a public parameterless constructor.

See Constraints on Type Parameters.

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It means you can construct the class with a parameterless public constructor. Or, it lets you do var entity= new TEntity(); without the compiler having fits.