C＃中的不安全指针/数组表示法

Question

Suppose I have:

unsafe {
    byte* start = GetStartLocation();
    int something = start[4];
}

What is something ? The value of the memory address 4 bytes down from start?

Answer 1

Say start points to memory location 0x12345678, and memory looks like this:

  0x12345678   0x12
  0x12345679   0x34
  0x1234567a   0x56
  0x1234567b   0x78
  0x1234567c   0x9a
  0x1234567d   0xbc

then something equals 0x9a .

The fact that something has type int doesn't matter to how start[4] is interpreted - it gets the byte value of the byte 4 locations away from start .

Answer 2

The value of something is the byte value of offset 4 from start widened to an int type.

It's equivalent to the following code

byte temp = start[4];
int something = temp;

Answer 3

start[4]将评估为：

*(start + 4)