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http://blogs.msdn.com/b/oldnewthing/archive/2008/06/27/8659071.aspx .NET GUID包括
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If you are creating the GUIds from the same machine and using the same algorithm then you will not get a collision. |
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http://en.wikipedia.org/wiki/Uuid#Random_UUID_probability_of_duplicates n概率 68719476736=2^36=0.00000000000000004=4_10_16) 2199023255552=2^41=0.000000000004=(4_10_13) 70368744177664=2^46=0.000000000004=(4_10__10) |
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