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();
}