普通的GUID.ToString()和GUID.ToString("D")输出为24个字符,有'-'分隔符的字符串,例:b3584f6b-1f97-4be1-a94f-df35d496bee4
GUID.ToString("N")输出为20个字符,无分隔符的字符串,例:cea2081a057840dbbc30301941920e50
GUID.ToString("B")输出为26个字符,有'-'分隔符的字符串,两端有"{}",例:{20713c2a-594f-4c80-a787-03ab2732b540}
GUID.ToString("P")输出为26个字符,有'-'分隔符的字符串,两端有"()",例:(b612d214-67fc-4285-9950-a1163a779e3d)
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