Cannot create an instance of abstract class

• Jun 07, 2019

CodeRush Classic shows the Cannot create an instance of abstract class code issue if an instance creation statement references an abstract class.

Fix

Create an instance of a non-abstract descendant of the current abstract class.

Purpose

Highlights the instance creation statements, which would cause the Cannot create an instance of the abstract class or interface compilation error.

Example

C#

abstract class MyClass
{
    public abstract void OutputText(string text);
}
public class TestClass
{
    public TestClass()
    {
        MyClass objVar = new │MyClass();
    }
}

Fix:

C#

abstract class MyClass
{
    public abstract void OutputText(string text);
}
class MyClassDescendant: MyClass
{
    public override void OutputText(string text)
    {
        Console.Write(text);
    }
}
public class TestClass
{
    public TestClass()
    {
        MyClass objVar = new MyClassDescendant();
    }
}