General understanding of C #(23. constructor and destructor)

23. constructor and destructor

You can specify the optional constructor parameters:

Class Test

{

Public Test (): this (0, null ){}

Public Test (int x, object o ){}

}

You can also specify the static constructor:

Class Test

{

Static int [] ascendingArray = new int [100];

Static Test ()

{

For (int I = 0; I <ascendingArray. Length; I ++)

AscendingArray [I] = I;

}

}

The name of the Destructor adopts the naming convention C ++ ~ Symbol. The Destructor can only be applied to reference types, value types are not allowed, and cannot be overloaded. The Destructor cannot be explicitly called because the object's life cycle is controlled by the garbage collector. Before the memory occupied by an object is recycled, each destructor in the Object Inheritance layer will be called.

Although similar to C ++, The destructor in C # is more like the finalize method in Java. This is because they are all called by the garbage collector rather than explicitly called by the programmer. Moreover, like Java's finalize, they cannot be guaranteed to be called in various circumstances (this is often the first time everyone who discovers this is shocked ). If you are used to the deterministic destructor programming mode (You know when the object's destructor is called), when you move to Java or C, you must adapt to this different programming model. What Microsoft recommends and implements throughout the. NET Framework is the dipose model. You need to define a dispose () method for the classes of external resources (shape handles or database connections) that need to be managed. For distributed programming, the. NET Framework provides an agreed basic model to improve the reference counting problem of DCOM.