C#this的五种用法

时间:2025-02-04 14:03:20

this的五种用法:

1.使用被掩盖的成员变量:

class AA

{

int a;

public void set1(int a)

{

this.a = a;//right

}

public void set2(int a)

{

a = a;//会有警告:“对同一变量进行赋值;是否希望对其他变量赋值?”;

}

}

2.把这个对象传给其他函数

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks; namespace ConsoleApplication1
{
class BB
{
static public void set(AA t,int a)
{
t.set1(a);
}
}
class AA
{
int a;
public void set1(int a)
{
this.a = a;
}
public void set2(int a)
{
BB.set(this, a);
}
public int get()
{
return a;
}
} class Program
{
static void Main(string[] args)
{
AA t = new AA();
t.set2();
Console.WriteLine(t.get());
}
}
}

3.With Indexers(索引器)//这个暂时不懂

4.调用其他构造函数

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks; namespace ConsoleApplication2
{
class AA
{
int a, b;
public AA(int a)
{
this.a = a;
b = -;
print();
}
public AA(int a,int b):this(a)
{
this.b = b;
print();
}
void print()
{
Console.WriteLine("{0} {1}", a, b);
}
}
class Program
{
static void Main(string[] args)
{
AA t = new AA();
t = new AA(, );
}
}
}

输出:

1 -1

1 -1

1 1

5.是代码更明确

如把

        public AA(int a)
{
this.a = a;
b = -;
print();
}

改为

        public AA(int a)
{
this.a = a;
this.b = -;
print();
}