C # basic programming and development knowledge,
In order to help you remember some basic C # And take notes based on examples, it is convenient for beginners to take notes after learning and to increase the basic memory.
// Enumeration type
// Can be defined under namespace or under class
Using System;
Namespace test1 {
??? // Defines the enumeration type
???? Enum GameState: byte // modify the storage type of this enumeration type. The default value is int {
??????? // You can also modify it, pause = 100, and add one for the rest.
??????? Pause ,?? // The default value is integer 0.
??????? Failed ,? // The default value is integer 1.
??????? Success, // The default value is Integer 2.
??????? Start ??? // The default value is Integer 3.
??? }
??? Class Program {
??????? Static void Main (){
??????????? /// Declare a variable using the defined enumerated type
??????????? // GameState state = GameState. Success;
??????????? //// Comparison of enumeration types
??????????? // If (state = GameState. Start)
??????????? //{
??????????? //??? Console. WriteLine ("the current game is in the starting state! ");
??????????? //}
??????????? // Console. WriteLine (state );
??????????? GameState state = GameState. Start;
??????????? Int number = (int) state;
??????????? Console. WriteLine (number );
??????????? Console. ReadLine ();???
??????? }}}
// Struct
// Can be defined under namespace or class
// Use struct to make the program clearer
// Several types are converted into one type
// You must learn to classify things
Using System;
Namespace test1 {
??? // Defines a struct.
??? Struct Position {
??????? Public float x;
??????? Public float y;
??????? Public float z;
??? }
??? Enum Direction {
??????? West,
??????? North,
??????? East,
??????? South
??? }
??? Struct Path {
??????? Public float distance;
??????? Public Direction dir;
??? }
??? Class Program {
??????? Static void Main (){
??????????? // When using struct to declare a variable, it is equivalent to using all the variables in the struct to declare
??????????? Position enemy1Position;
??????????? Enemy1Position. x = 34;
// You can access the specified variable in the struct by adding an attribute name.
??????????? Path pa;
??????????? Pa. distance = 1000;
??????????? Pa. dir = Direction. East;
??????????? Console. ReadKey ();
???? }}}
// Array
// Unlike other languages, [] is placed after the array type
// An error is reported when an index does not exist.
Using System;
Namespace test1 {
??? Class Program {
??????? Static void Main (){
??????????? Int [] scores;
??????????? Scores = new int [4];
??????????? Scores = new int [] {23,12, 45,13 };
??????????? For (int I = 0; I ??????????? {
??????????????? Console. WriteLine (scores [I]);
??????????? }
??????????? // Foreach retrieves the elements in the array in sequence, assigns them to temp, assigns them to temp, and then executes the loop body
??????????? Foreach (int temp in scores)
??????????? {
??????????????? Console. WriteLine (temp );
??????????? }
??????????? Console. ReadKey ();
???? }}}
// String processing
// Name. Length returns the Length of a string or array.
// Name. ToLower (): converts the string to lowercase and returns the result, without affecting the original string.
// Name. ToUpper (): converts the string to uppercase and returns the result, without affecting the original string.
// Name. Trim (): removes spaces before and after the string, which has no effect on the original string.
// Name. TrimStart (): removes spaces in front of the string and does not affect the original string.
// Name. TrimEnd (): removes spaces after the string, which has no effect on the original string.
// Name. Split ('Char '): splits the original string according to the specified character to obtain a Split string array.
Using System;
Namespace test1 {
??? Class Program {
??????? Static void Main (){
??????????? String str1 = "WWW.baidu.com ?? ";
??????????? Int num = str1.Length;
??????????? Foreach (char temp in str1)
??????????? {
??????????????? Console. Write (temp );
??????????? }
??????????? // String res = str1.ToLower ();
??????????? // String res = str1.ToUpper ();
??????????? // String res = str1.Trim ();
??????????? // String res = str1.TrimStart ();
??????????? // String res = str1.TrimEnd ();
??????????? String [] res = str1.Split ('.');
??????????? Console. WriteLine (str1 );
??????????? Foreach (string temp in res)
??????????? {
??????????????? Console. WriteLine (temp );
??????????? }
??????????? Console. ReadKey ();
???? }}}
// Define a random number ranging from 0 to 50
Random number = new Random ();
Int number1 = number. Next (0, 51 );
// Fast sorting, using a fast algorithm
Array. Sort (name); name = Array
// Array Function with the number of unknown parameters
Using System;
Namespace test1 {
??? Class Program {
??????? // An array of parameters is defined here, and the number of parameters is unknown.
??????? Static int Plus (params int [] array ){
??????????? Int sum = 0;
??????????? For (inti = 0; I ??????????????? Sum + = array [I];
??????????? }
??????????? Return sum;
??????? }
??????? Static void Main (){
??????????? Int sum = Plus (1, 2, 3 );
??????????? Console. WriteLine (sum );
??????????? Console. ReadKey ();
???? }}}
