在指定的时间间隔内在C＃中创建随机GUID

Question

Using the .NET Framework, is there a way to create a random GUID in C# within a specified interval? For example, I need a random GUID that is greater than ffffffff-ffff-ffff-ffff-1fffffffffffff and less than ffffffff-ffff-ffff-ffff-2fffffffffffff.

Answer 1

Use this overload :

[CLSCompliantAttribute(false)]
public Guid(
    uint a,
    ushort b,
    ushort c,
    byte d,
    byte e,
    byte f,
    byte g,
    byte h,
    byte i,
    byte j,
    byte k
)

Guid(0xa,0xb,0xc,0,1,2,3,4,5,6,7) creates a Guid that corresponds to:

0000000a-000b-000c-0001-020304050607

You can randomize the parameters any way you like. For example, you can do:

var r[] = new byte[] { 1,2,3,4 } // chosen by fair dice rolls
                                 // guaranteed to be random

var guid = new GUID(0xFFFFFFFF, 0xFFFF, 0xFFFF, 0xFFFF, r[1], r[2], r[3], r[4]...

Well, you get the idea. You have to do some bit twiddling to get the fifth parameter right.