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Is the GUID format always the same?

GUID you get something like aaaef973-d8ce-4c92-95b4-3635bb2d42d5

Is it always the same? Will always have the following format

8 char "-", 4 char "-", 4 char "-", 4 char "-", 12 char

I ask because I need to convert a GUID without a “-” to a GUID with a “-” and a visa type.

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string c # guid
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3 answers

Not; There are other formats, such as the format you specified, except for the brackets. There are also more complex formats. Here are some of the MSDN list formats:

UUID Formats

  • 32 digits: 00000000000000000000000000000000 (N)
  • 32 digits separated by hyphens: 00000000-0000-0000-0000-000000000000 (D)
  • 32 digits separated by a hyphen enclosed in braces: {00000000-0000-0000-0000-000000000000} (B)
  • 32 digits separated by a hyphen enclosed in parentheses: (00000000-0000-0000-0000-000000000000) (P)
  • Four hexadecimal values ​​enclosed in curly braces, where the fourth value is a subset of eight hexadecimal values, which are also enclosed in curly brackets: {0x00000000,0x0000,0x0000,{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00}} (X)

- MSDN

+22
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You just have to rely on the fact that these are 32 hexadecimal characters, there can be many ways to represent it. See the Wikipedia article for details, including a description of how they are usually written.

For your conversion, you must really rely on the static methods of Guid.Parse () . Using a combination of your example and the ones listed in icktoofay answer , this works great:

  var z = Guid.Parse("aaaef973-d8ce-4c92-95b4-3635bb2d42d5"); z = Guid.Parse("{aaaef973-d8ce-4c92-95b4-3635bb2d42d5}"); z = Guid.Parse("{0x00000000,0x0000,0x0000,{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00}}");

then you can use the Guid.ToString () method with one of the installed format codes to display them with hyphens or without them.

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In most cases, GUIDS are 32-character hexadecimal strings, such as {21EC2020-3AEA-1069-A2DD-08002B30309D} (if they are not encoded in Base-64) and are usually stored as 128-bit integers. However, they will not always have hyphens.

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