April October 9, 2014-language basics 1

Class Library, referenced, called

Namespace (can contain multiple classes)

Class. CS files, storing code

Main function static void

Code

. Config stores configuration parameter files

. Csproj project file

. Sln solution, Project Management

 

Alt + → prompt,

CTRL + k, and then press Ctrl + C to comment out the line

CTRL + k, and then press Ctrl + u to cancel the comment

Remove the following brackets and write them again. The Non-Alignment rows will be automatically rearranged.

 

Three methods of annotation ://,/**/,///

How to change the font-→ tools-options-environment-fonts and colors

 

How to change the row number-→ tools-options-Text Editor-row number

 

/* Useing indicates the library referenced by the program, and the following system indicates that these libraries are created on the console. Netframework2.0 provides */using system; using system. collections. generic; using system. LINQ; using system. text; using system. threading. tasks;/* when creating a project, a namespace is automatically created, that is, the namespace can control the scope of classes and variables */namespace helloworld {/* class indicates the class, C # is an object-oriented language. When all programs have classes that constitute the Project Creation, Vs will automatically create this program class */class program {/* main is the main function, the program starts from */static void main (string [] ARGs) {console. writeline ("Hello! World !!! "); Console. Readline (); // This is to prevent the console from exiting immediately }}

I. Data Types

1. Value Type

Integer: the unsigned integer is twice the positive number of the signed integer plus 1.

. That is, uint = 2 x int + 1.

Signed integer: sbyte, Int, short, long (commonly used)

Unsigned integer: bytre, uint, ushort, ulong

 

2. floating point:

Float

Decimal

Double,

3. Balanced type:

Char Si = 'ffddfsd' single quotes

4. boolean bool is used to judge

True and false,

5, string

String is equivalent to character type and has a long length. It is defined as double quotation marks.

6. Date and Time types

Datetime,

7. Enumeration type

Enum

Enum days {sat, sun, Mon, Tue, wed, Thu, Fri };

8. Structure Type

Struct is usually used to encapsulate small variable groups,

For example, coordinates of a rectangle or features of an inventory item.

The following example shows a simple structure declaration.

Public struct book

{

Public decimal price;

Public String title;

Public String author;

}

2. Reference Type

1. string type

String represents a Character Sequence (zero or more Unicode characters ). String is the alias of string in. NET Framework.

String A = "hello ";

String B = "H ";

2. class type

All other types of final base classes of the object

Class A {sasasasa} code, user-defined type

3. Interface Type

Interface

4. array type

One-dimension and multi-dimensional arrays, such as int [] and INT [,]

 

April October 9, 2014-language basics 1