路透

1. int a = 258;

byte b = (byte)a;

int 转换为byte 溢出部分将被截断

2. 抽象属性不能有body； get or set 不能为private；public抽象属性可以有protected get or set, 但不能两个都为protected

3. class A

class B : A

B b = new B();

A a = (a)b; // It's OK, same as [A a = b;]

4. IComparer<T>, IComparable

int Compare(T x,T y), int CompareTo(object obj)

5. int[,] a = {
                       {1,2,3,4},
                       {5,6,7,8},
                       {9,10,11,12}
                   };

//某一维度的索引上限

a.GetUpperBound(1)

//所有维度的元素总和

a.Length

//维度数

a.Rank

6. bool a = false, b = true;
if (a = b)
{  }