Non-nullable types in C # are converted to nullable types

By default, there are only two types of C #:

1. Nullable type: (Refers to nullable)

Most of the objects, such as: dog dog = null;

2. Non-nullable type:

Basic value type, Boolean type, such as: int a = 0;//correct

int a = null;//error

3. Non-nullable methods to convert to nullable types:

int? a = null; add a question mark after the non-nullable type "?" Can be converted to a nullable type .

Tips:

The int type is also nullable in the database, and Microsoft has introduced this in order to be conceptually consistent.

Of course, its meaning is not only so, continue to delve into it.

Non-nullable types in C # are converted to nullable types