How to Convert a List of Derived Classes to a List of Base Classes in C#?

C#Lyrics are transformed into a list of base class

The inheritance mechanism allows us to create new classes based on the existing class, but the same concept is not directly applicable to generic lists. Specifically, we cannot declare a

and assign a list of derived types, even if the derived class inherits the self -based class. Please consider the following example:

List<基类>

This code fails during compilation, because the compiler expects a list of an A object, not the list of the C object. To solve this problem, we need to convert the list of derived objects into a list of base objects.

<code class="language-csharp">interface A { }

class B : A { }

class C : B { }

class Test
{
    static void Main(string[] args)
    {
        A a = new C(); // 正确
        List<A> listOfA = new List<C>(); // 编译错误
    }
}</code>

conversion method

The method of converting to is to iterate the list elements and manually convert them manually. This can be implemented using

Method:

List<派生类> List<基类> Here, each of the elements in the iteratory C list convert it to type A and add it to the new Listofa list. ConvertAll

The alternative method of using linq

<code class="language-csharp">List<A> listOfA = new List<C>().ConvertAll(x => (A)x);</code>

or, we can use Linq to execute the conversion:

Here, convert each element in the list to type A, and

creates a new list containing the conversion element.

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