代码:
class A
{
public int aa = 12;
}
static class B
{
public static int test(this A a)
{
return a.aa = a.aa + 10;
}
}
class Program
{
static void Main(string[] args)
{
var v = new A();
Console.WriteLine(v.test());
Console.Read();
}
}
代码讲解:

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