C＃/. Net phase VI 01C Foundation_ 01: running environment, process of creating new C program, strict case sensitivity, meaning of class library

List of articles

On

Specific catalogue

Why can computers recognize our code

first C# Program

newly build C# Procedure flow

If we want to make a name called QQ Project
The first step is to create a new folder


The suffix can also be left unchanged , The most important thing is the content in the document

Be careful C# It's strictly case sensitive

Meaning of class library

It's the code written by others for us , We just need to call

Comments do not participate in the compilation of code

The main method is the entry to the program

How to compile （ No development tools ）

After writing, press enter

Human recognizable become Computers can recognize
There is only a compilation process in the middle

Answering question

Pay attention to recompile the changed code , Re execution , If you don't recompile , The original code is still executed
Compile again

Using development software is to improve development efficiency

One solution can put multiple projects

Try to choose the latest Framework version when learning
But when it comes to specific applications , It's related to the server , Try to use whatever version of your server is used , In this way, there is no need to rent new servers
The version can also be changed

Version information ( understand )

In fact, it is version information
That is, when we open the properties of a file , Information displayed , Just get to know , Generally, there is no need to change

Add reference ( important )

Adding a reference is adding a piece of code written by others , Or general code
This can be used in our project

Namespace

To avoid duplicate names , Follow java The concept of the package inside is similar
If the role is not easy to understand , It can be understood that a namespace is a folder


Just to avoid that

When copying someone else's code , You often need to change the name of the namespace , Change to our own namespace

Summary

C#(Java) Object oriented high level language  
 Microsoft 2000 year 6 month   
VB  Delphi  C++

1、 performance  C++  C  The pointer ( Various anomalies )
2、 Cost performance （ have access to 、 Lower development cost ） Short development cycle 

 All development languages , Purpose ： Communicate with the computer 


Visual Studio 2019
Microsoft SQL Server Management Studio 18

 Distribution environment ：1、 development environment  2、 Running environment 

ios   Android   windows

C#  Basic grammar 
xp win98 win95
windows  from win7 Install by default in the future .net framework

 A set of class libraries ( Written code )
 Why can computers recognize that we write code ？
( Interlingua ) assembly language 16 Base number 
0 1 Binary system 
csc.exe  compiler 

.txt
.cs Class file 
 Keywords are strictly case sensitive 
class QQ{
    
      The main method is the entry to the program ( Case sensitive )
}
using  Introduce namespace ( Introduce someone else's project code )

// annotation ： After writing anything, it does not participate in compilation 
 To compile the first > perform 
 First step ： Find the compiler directory 
C:\Users\MI>cd C:\Windows\Microsoft.NET\Framework64\v4.0.30319
 The second step ： Compile code 
C:\Windows\Microsoft.NET\Framework64\v4.0.30319>csc.exe /out:d:\qq.exe d:\qq\qq.txt


Console  Test class ( Real development doesn't necessarily work )
Console.WriteLine(" Hello ");// Output printing 
Console.ReadLine();// Accept user input