C # sealing class, constant const, read-only readonly,

C # sealing class, constant const, read-only readonly,

// Class modified by sealed, which cannot be inherited
Sealed class
{
}
Class B: A // cannot be inherited
{
}
// The sealing method will override the method in the base class.
// Method modified by sealed, which cannot be overwritten later
Class
{
Public virtual void D ()
{
}
}
Class B:
{
Public sealed overried D ()
{
}
}
Class C:
{
Public overried D () // cannot be overwritten at this time
{
}
}
// The const modifier variable cannot be modified.
Const int a = 100;
// Readonly cannot modify local variables and can only be used as global variables.
Raedonly int B = 100;
Public void Test ()
{
A = 150; // z this cannot be modified
B + = 100; // cannot be implemented because B is read-only
}