C# |本关键词
这个 关键字是用来引用类的当前实例的。它用于从构造函数、实例方法和实例访问器中访问成员。这个关键字也用于跟踪实例，该实例被调用来执行与该实例相关的一些计算或进一步处理。以下是在 C# 中使用“this”关键字的不同方式: 程序 1: 使用“this”关键字引用当前类实例成员
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// C# program for using 'this' keyword to
// refer current class instance members
using System;
namespace geeksforgeeks {
class Geeks {
// instance member
public string Name;
public string GetName()
{
return Name;
}
public void SetName(string Name)
{
// referring to current instance
//"this.Name" refers to class member
this.Name = Name;
}
}
class program {
// Main Method
public static void Main()
{
Geeks obj = new Geeks();
obj.SetName("Geeksforgeeks");
Console.WriteLine(obj.GetName());
}
}
}
Output:
Geeksforgeeks
程序 2 : 用这个()调用同一个类的构造函数
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// C# program for using 'this' keyword to
// invoke the constructor in same class
using System;
namespace geeksforgeeks {
class Geeks {
// calling another constructor
// calls Geeks(string Name)
// before Geeks()
public Geeks() : this("geeks")
{
Console.WriteLine("Non-Parameter Constructor Called");
}
// Declare Parameter Constructor
public Geeks(string Name)
{
Console.WriteLine("Parameter Constructor Called");
}
}
class program {
// Main Method
public static void Main()
{
Geeks obj = new Geeks();
// Warning: obj never used..
}
}
}
输出:
Parameter Constructor Called
Non-Parameter Constructor Called
程序 3: 使用‘this’关键字调用当前类方法
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// C# code for using this to invoke current
// class method
using System;
class Test {
void display()
{
// calling function show()
this.show();
Console.WriteLine("Inside display function");
}
void show()
{
Console.WriteLine("Inside show function");
}
// Main Method
public static void Main(String []args)
{
Test t1 = new Test();
t1.display();
}
}
Output
Inside show function
Inside display function
程序 4: 使用‘this’关键字作为方法参数
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// C# code for using 'this'
// keyword as method parameter
using System;
class Test
{
int a;
int b;
// Default constructor
Test()
{
a = 10;
b = 20;
}
// Method that receives 'this'
// keyword as parameter
void display(Test obj)
{
Console.WriteLine("a = " + a + " b = " + b);
}
// Method that returns current
// class instance
void get()
{
display(this);
}
// Main Method
public static void Main(String[] args)
{
Test obj = new Test();
obj.get();
}
}
Output:
a = 10 b = 20
程序 5: 使用此关键字声明索引器
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// C# code for using 'this'
// keyword to declare indexer
using System;
namespace geeksforgeeks {
class Geeks {
private string[] days = new string[7];
// declaring an indexer
public string this[int index]
{
get
{
return days[index];
}
set
{
days[index] = value;
}
}
}
class Program {
// Main Method
public static void Main()
{
Geeks g = new Geeks();
g[0] = "Sun";
g[1] = "Mon";
g[2] = "Tue";
g[3] = "Wed";
g[4] = "Thu";
g[5] = "Fri";
g[6] = "Sat";
for (int i = 0; i < 7; i++)
Console.Write(g[i] + " ");
}
}
}
Output:
Sun Mon Tue Wed Thu Fri Sat
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