Question

我是学生，我想知道有没有一种方法可以为泛型类型指定类型？
例如，我有一个IEntity接口，如下面的代码

public interface IEntity<T> where T : // What I should input here?
{
    public T Id { get; set; }
}

如果我只希望T为int，string和Guid，该怎么办？
我尝试这样做：

public interface IEntity<T> where T : int, string, Guid // Compile Error: 
//'int' is not a valid constraint. A type used as a constraint must be an interface, a non-sealed class or a type parameter.
//'string' is not a valid constraint. A type used as a constraint must be an interface, a non-sealed class or a type parameter.
//'Guid' is not a valid constraint. A type used as a constraint must be an interface, a non-sealed class or a type parameter.
{
    public T Id { get; set; }
}

我可以将IComparable，int和string的T设置为Guid，但是某些数据类型（例如float）也可以从IComparable传递。我只想输入3种类型：int，string和Guid，有能力做到这一点吗？

C＃中是否有特定类型的泛型类型

0 个答案: