将接口传递给 C# 中类的通用属性？

Question

When a do this:

public class ball {
    ITeste<IItem> Teste{ get; set; }
}

I got the error:

'IItem' must be a non-abstract type with a public parameterless constructor in order to use it as parameter 'T' in the generic type or method

ITeste:

public interface ITeste<T> 
        where T : IItem, IEquatable<T>, new()
{
    //ITeste code
}

IItem:

public interface IItem : IEquatable<IItem>
{
    //IItem Code
}

It seems to be a simple question, but I could not find the answer. Any help it would be appreciated.

Answer 1

Remove new() from the constraints for ITeste

ITeste:

public interface ITeste<T>where T : IItem, IEquatable<T>
{
    //ITeste code
}