ref和out用法

public static class Test()
{
public static void Test1(ref int t)
{
Console.Write(t);
t = 200;
Console.WriteLine(t);
}

public staticvoid Test2(out int t)
{
t = 100;
}
}

public class Program
{
static void Main()
{
int t1 = 100;
Test.Test1(ref t1);
Console.WriteLine(t1);
int t2 ;
Test.Test2(out t2);
Console.WriteLine(t2);
}
}

标注为红色的，是必须要写的；
然后输出为：
100
200
100

你把代码copy下去，自己测试下就知道其中的奥妙了~~~