C# Constructor Inheritance: Base Class or Derived Class First?

C# constructor execution order

In C#, the execution order of constructors plays a crucial role in object initialization. When defining a class constructor with parameter inheritance, for example:

<code>Class(Type param1, Type param2) : base(param1) </code>

It raises the question: is the class constructor executed before or after the superclass constructor?

Execution process:

The execution flow of constructor in C# is as follows:

1. Member variables are initialized to default values ​​for all classes in the hierarchy.

2. Start with the most derived class:

   • Execute variable initializers for most derived types.
   • The constructor chain determines which base class constructor will be called.
   • Initialize the base class (recursively repeat this process).
   • Execute the constructor body in the chain in the current class.

It is important to note that in Java, base classes are initialized before running variable initializers. This is a key difference when porting code between C# and Java.

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