static void Main()
{
Console.WriteLine("***** Fun with Custom Generic Methods *****\n");
// Поменяем два целых числа
int a = 10, b = 90;
Console.WriteLine("Before swap: {0}, {1}", a, b);
MyGenericMethods.Swap(ref a, ref b);
Console.WriteLine("After swap: {0}, {1}", a, b);
Console.WriteLine();
// Поменяем местами две строки
string s1 = "Hello", s2 = "There";
Console.WriteLine("Before swap: {0} {1}!", s1, s2);
MyGenericMethods.Swap(ref s1, ref s2);
Console.WriteLine("After swap: {0} {1}!", s1, s2);
Console.WriteLine();
// Компилятор выведет тип автоматически по контексту
bool b1 = true, b2 = false;
Console.WriteLine("Before swap: {0}, {1}", b1, b2);
MyGenericMethods.Swap(ref b1, ref b2);
Console.WriteLine("After swap: {0}, {1}", b1, b2);
Console.WriteLine();
// Здесь нужно указать параметр типа явно, потому что метод не принимает параметров
MyGenericMethods.DisplayBaseClass <int>();
MyGenericMethods.DisplayBaseClass <string>();
Console.ReadLine();
}
static void Main(string[] args)
{
double a = 90;
double b = 10;
string c = "World";
string d = "Hello";
bool a1 = true;
bool b1 = false;
Console.WriteLine("Before a = {0}, b = {1}", a, b);
MyGenericMethods.Swap <double>(ref a, ref b);
Console.WriteLine("After a = {0}, b = {1}", a, b);
Console.WriteLine("Before c = {0}, d = {1}", c, d);
MyGenericMethods.Swap <string>(ref c, ref d);
Console.WriteLine("After c = {0}, d = {1}", c, d);
MyGenericMethods.Swap <bool>(ref a1, ref b1);
MyGenericMethods.DispalayBaseClass <int>();
MyGenericMethods.DispalayBaseClass <string>();
Console.ReadLine();
}
static void InstanceLevel()
{
Console.ForegroundColor = ConsoleColor.DarkYellow;
Console.WriteLine("=> non-static custom generic methods");
MyGenericMethods c = new MyGenericMethods();
string s1 = "Tokyo", s2 = "Nagoya";
Console.WriteLine($"Before swap: <{s1}>, <{s2}>");
c.Swap <string>(ref s1, ref s2);
c.DisplayBaseClass <string>();
Console.WriteLine($"After swap: <{s1}>, <{s2}>");
Person p1 = new Person {
FirstName = "Steve", LastName = "Wang", Age = 55
};
Person p2 = new Person {
FirstName = "Mike", LastName = "Lee", Age = 37
};
Console.WriteLine($"Before swap: <{p1}>, <{p2}>");
c.Swap <Person>(ref p1, ref p2);
c.DisplayBaseClass <Person>();
Console.WriteLine($"After swap: <{p1}>, <{p2}>");
}
static void Main(string[] args)
{
Console.WriteLine("****** Fun with Custom Generic Methods ******\n");
// Swap 2 ints
int a = 10, b = 90;
Console.WriteLine("Before the swap a = {0}, b = {1}", a, b);
MyGenericMethods.Swap(ref a, ref b);
Console.WriteLine("After the swap a = {0}, b = {1}", a, b);
Console.WriteLine();
// Swap two strings
string s1 = "Hello", s2 = "World";
Console.WriteLine("Before swap it reads: {0} {1}", s1, s2);
MyGenericMethods.Swap(ref s1, ref s2);
Console.WriteLine("After swap it reads: {0} {1}", s1, s2);
// Swap two bool
bool b1 = true, b2 = false;
Console.WriteLine("Before swap it reads: {0} {1}", b1, b2);
MyGenericMethods.Swap <bool>(ref b1, ref b2);
Console.WriteLine("After swap it reads: {0} {1}", b1, b2);
MyGenericMethods.DisplayBaseClass <int>();
MyGenericMethods.DisplayBaseClass <string>();
// Compiler error must supply base class
// DisplayBaseClass();
Console.ReadLine();
}
static void Main(string[] args)
{
Console.WriteLine("**** Fun with custom generic methods ****");
int i1 = 10;
int i2 = 5;
Console.WriteLine("Before swaping: {0} {1}", i1, i2);
MyGenericMethods.Swap <int>(ref i1, ref i2);
Console.WriteLine("After swaping: {0} {1}", i1, i2);
Console.WriteLine();
string str1 = "Hello";
string str2 = "there";
Console.WriteLine("Before swaping: {0} {1}", str1, str2);
MyGenericMethods.Swap <string>(ref str1, ref str2);
Console.WriteLine("After swaping: {0} {1}", str1, str2);
Console.WriteLine();
MyGenericMethods.DisplayType <bool>();
MyGenericMethods.DisplayType <string>();
Console.WriteLine();
Console.ReadLine();
}
static void Main(string[] args)
{
Console.WriteLine("***** Fun with Custom Generic Methods *****\n");
// Swap 2 ints.
int a = 10, b = 90;
Console.WriteLine("Before swap: {0}, {1}", a, b);
MyGenericMethods.Swap <int>(ref a, ref b);
Console.WriteLine("After swap: {0}, {1}", a, b);
Console.WriteLine();
// Swap 2 strings.
string s1 = "Hello", s2 = "There";
Console.WriteLine("Before swap: {0} {1}", s1, s2);
MyGenericMethods.Swap <string>(ref s1, ref s2);
Console.WriteLine("After swap: {0} {1}", s1, s2);
Console.WriteLine();
// Compiler will infer System.Boolean.
bool b1 = true, b2 = false;
Console.WriteLine("Before swap: {0}, {1}", b1, b2);
MyGenericMethods.Swap(ref b1, ref b2);
Console.WriteLine("After swap: {0}, {1}", b1, b2);
Console.WriteLine();
// Must supply type parameter if
// the method does not take params.
MyGenericMethods.DisplayBaseClass <int>();
MyGenericMethods.DisplayBaseClass <string>();
Console.WriteLine();
// Compiler error! No params? Must supply placeholder!
// DisplayBaseClass();
List <int> nums = new List <int> {
10, 11, 12
};
List <string> names = new List <string> {
"johnny", "steve", "mike"
};
List <object> objs = new List <object> {
"johnny", 24, true
};
PrintItemsInList <int>(nums);
PrintItemsInList <string>(names);
PrintItemsInList <object>(objs);
Console.ReadLine();
}
static void Main(string[] args)
{
Console.WriteLine("***** Fun with Custom Generic Methods *****\n");
// Swap 2 ints.
// no parameters for DisplayBaseClass(), so no signature, so need to provide type T
MyGenericMethods.DisplayBaseClass <int>();
int a = 10, b = 90;
Console.WriteLine("Before swap: {0}, {1}", a, b);
MyGenericMethods.Swap <int>(ref a, ref b);
Console.WriteLine("After swap: {0}, {1}", a, b);
Console.WriteLine();
// Swap 2 strings.
MyGenericMethods.DisplayBaseClass <string>();
string s1 = "Hello", s2 = "There";
Console.WriteLine("Before swap: {0} {1}", s1, s2);
MyGenericMethods.Swap <string>(ref s1, ref s2);
Console.WriteLine("After swap: {0} {1}", s1, s2);
Console.WriteLine();
// Compiler will infer System.Boolean from signature
MyGenericMethods.DisplayBaseClass <bool>();
bool b1 = true, b2 = false;
Console.WriteLine("Before swap: {0}, {1}", b1, b2);
MyGenericMethods.Swap(ref b1, ref b2);
Console.WriteLine("After swap: {0}, {1}", b1, b2);
Console.WriteLine();
Person p1 = new Person()
{
FirstName = "John", LastName = "Doe", Age = 21
};
Person p2 = new Person()
{
FirstName = "Sven", LastName = "Klepsch", Age = 15
};
MyGenericMethods.DisplayBaseClass <Person>();
Console.WriteLine("Before swap: {0}, {1}", p1, p2);
MyGenericMethods.Swap(ref p1, ref p2);
Console.WriteLine("After swap: {0}, {1}", p1, p2);
Console.WriteLine();
Console.ReadLine();
}
static void Main(string[] args)
{
Console.WriteLine("***** Fun with Custom Generic Methods *****\n");
// Swap 2 ints.
int a = 10, b = 90;
Console.WriteLine("Before swap: {0}, {1}", a, b);
MyGenericMethods.Swap <int>(ref a, ref b);
Console.WriteLine("After swap: {0}, {1}", a, b);
Console.WriteLine();
// Swap 2 strings.
string s1 = "Hello", s2 = "There";
Console.WriteLine("Before swap: {0}, {1}", s1, s2);
MyGenericMethods.Swap <string>(ref s1, ref s2);
Console.WriteLine("After swap: {0}, {1}", s1, s2);
Console.WriteLine();
// Compiler will infer System.Boolean.
// Only works if generic method requires arguments.
// Should include tpye parameter for readability.
bool b1 = true, b2 = false;
Console.WriteLine("Before swap: {0}, {1}", b1, b2);
MyGenericMethods.Swap(ref b1, ref b2);
Console.WriteLine("After swap: {0}, {1}", b1, b2);
Console.WriteLine();
// DisplayBaseClass requires no arguments,
// so type parameter must be supplied.
MyGenericMethods.DisplayBaseClass <int>();
MyGenericMethods.DisplayBaseClass <string>();
// Compiler error! No params? Must supply placeholder!
//DisplayBaseClass();
}
static void Main(string[] args)
{
Console.WriteLine("***** Fun with custom Generic methods *****\n");
// 交换两个整数
int a = 10, b = 90;
Console.WriteLine("Befero swap:{0},{1}", a, b);
MyGenericMethods.Swap <int>(ref a, ref b);
Console.WriteLine("After swap:{0} {1}", a, b);
Console.WriteLine();
// 交换两个字符
string s1 = "Hello", s2 = "There";
Console.WriteLine("Befero swap:{0} {1}", s1, s2);
MyGenericMethods.Swap <string>(ref s1, ref s2);
Console.WriteLine("After swap:{0} {1}", s1, s2);
Console.WriteLine();
// 编译器将推断System.Boolen
bool b1 = true, b2 = false;
Console.WriteLine("Befero swap:{0} {1}", b1, b2);
MyGenericMethods.Swap(ref b1, ref b2);
Console.WriteLine("After swap:{0} {1}", b1, b2);
Console.WriteLine();
// 方法没有参数,就必须提供类型参数
MyGenericMethods.DisplayBaseClass <int>();
MyGenericMethods.DisplayBaseClass <string>();
// 编译器错误!没有参数时必须提供占位符
// DisplayBaseClass();
Console.WriteLine();
Console.ReadLine();
}
static void Main(string[] args)
{
Console.WriteLine("***** Fun with Custom Generic Methods *****\n");
// Swap 2 ints.
int a = 10, b = 90;
Console.WriteLine("Before swap: {0}, {1}", a, b);
MyGenericMethods.Swap <int>(ref a, ref b);
Console.WriteLine("After swap: {0}, {1}", a, b);
Console.WriteLine();
// Swap 2 strings.
string s1 = "Hello", s2 = "There";
Console.WriteLine("Before swap: {0} {1}", s1, s2);
MyGenericMethods.Swap <string>(ref s1, ref s2);
Console.WriteLine("After swap: {0} {1}", s1, s2);
Console.WriteLine();
// Compiler will infer System.Boolean.
bool b1 = true, b2 = false;
Console.WriteLine("Before swap: {0}, {1}", b1, b2);
MyGenericMethods.Swap(ref b1, ref b2);
Console.WriteLine("After swap: {0}, {1}", b1, b2);
Console.WriteLine();
// Must supply type parameter if
// the method does not take params.
MyGenericMethods.DisplayBaseClass <int>();
MyGenericMethods.DisplayBaseClass <string>();
// Compiler error! No params? Must supply placeholder!
// DisplayBaseClass();
Console.ReadLine();
}
static void Main(string[] args)
{
Console.WriteLine("**** Fun with Custom Generic Methods****\n");
//swap 2 ints
int a = 10, b = 20;
Console.WriteLine($"Before swap: {a}:{b}");
MyGenericMethods.Swap <int>(ref a, ref b);
Console.WriteLine($"After swap: {a}:{b}");
Console.WriteLine();
//swap 2 strings
string s1 = "Hello", s2 = "There";
Console.WriteLine($"Before swap: {s1}:{s2}");
MyGenericMethods.Swap <string>(ref s1, ref s2);
Console.WriteLine($"After swap: {s1}:{s2}\n");
MyGenericMethods.DisplayBaseClass <string>();
MyGenericMethods.DisplayBaseClass <int>();
MyGenericMethods.DisplayBaseClass <object>();
Console.ReadKey();
}
static void Main(string[] args)
{
int a = 3;
int b = 4;
Person per1 = new Person()
{
F_Name = "JJ", L_Name = "H", Age = 22
};
Person per2 = new Person()
{
F_Name = "My", L_Name = "Girl", Age = 21
};
MyGenericMethods.Swap <int>(ref a, ref b);
MyGenericMethods.Swap <Person>(ref per1, ref per2);
Console.WriteLine("a: {0} b: {1}", a, b);
Console.WriteLine("per1: {0}", per1);
Console.WriteLine("per2: {0}", per2);
MyGenericMethods.DisplayBaseClass <int>();
MyGenericMethods.DisplayBaseClass <Person>();
Console.ReadLine();
}