Chapter III Implementation flow of the management program flow (in. net4.5)

1. Overview

This chapter includes Boolean expressions, flow control methods, collection traversal, and flow jumps.

2. Main content

* As the content of the chapter is relatively basic, the daily use of a lot, so the basic content of some commonly used not to repeat.

　　2.1 Using Boolean expressions

Familiar with the following comparison operators: <, >=, <=, = =,! =.

Be familiar with the following logical expressions: &&, | |, ^.

BOOL true ; BOOL false  //False//true//false

　　2.2 Program Flow control

C # provides flow control modes: If, while, does while, for, foreach, switch, break, continue, Goto,?? (Null-coalesce op),?:( Conditional op).

int NULL ; int NULL ; int z = x?? Y?? -1; The value of Z is-1

　　2.3 Integrated Traversal

You can use for, foreach, while, and do and four ways to traverse.

foreach inch people) {    "Changed"//OK    New // Compile Error}

The reason for the above code compilation error is the way that foreach is implemented:

New people. GetEnumerator (); Try {person    v;      while (E.movenext ())          = e.current;} finally {    as  system.idisposable;     if NULL )        d.dispose ();}

Chapter III Implementation flow of the management program flow (in. net4.5)