var guid = Guid.NewGuid();
Debug.WriteLine(guid.ToString());   //1f3c6041-c68f-4ab3-ae19-f66f541e3209
Debug.WriteLine(guid.ToString("N"));//1f3c6041c68f4ab3ae19f66f541e3209
Debug.WriteLine(guid.ToString("D"));//1f3c6041-c68f-4ab3-ae19-f66f541e3209
Debug.WriteLine(guid.ToString("B"));//{1f3c6041-c68f-4ab3-ae19-f66f541e3209}
Debug.WriteLine(guid.ToString("P"));//(1f3c6041-c68f-4ab3-ae19-f66f541e3209)
Debug.WriteLine(guid.ToString("X"));//{0x1f3c6041,0xc68f,0x4ab3,{0xae,0x19,0xf6,0x6f,0x54,0x1e,0x32,0x09}}

在C#中生成GUID的方法