我可以将一个实现接口的通用 T 数组转换为这个特定的接口数组吗？

Question

I would like to do something like this: automatically convert array of T to some interface that T implements:

public static void GenericFunction<T>(T[,] genericArray) where T : ISomeInterface
{
    OtherFunction(genericArray);
}

public static void OtherFunction(ISomeInterface[,] interfaceArray)
{
    //stuff
}

This produces an error "cannot convert from 'T[ , ]' to 'ISomeInterface[ , ]' " Is this possible to do without using Select or iterating whole array?

Answer 1

The necessary conditions for an implicit conversion from an array type S with element type SE to another array type T with element type TE to exist are ( language spec ):

• S and T differ only in element type. In other words, S and T have the same number of dimensions.
• Both SE and TE are reference_types.
• An implicit reference conversion exists from SE to TE .

In your case, there is no guarantee that T is a reference type (second condition). One way to make your code work is therefore to constrain T to reference types:

public static void GenericFunction<T>(T[,] genericArray) where T : class, ISomeInterface