Is the format of GUID always the same?

问题

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

Is it always the same? Is it always going to have the following format

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

I'm asking because i need to convert a GUID without "-" to GUID with "-" and vice visa.

回答1:

No; there are other formats, such as the format you listed except with braces. There's also more complex formats. Here are some of the formats MSDN lists:

UUID formats

32 digits: 00000000000000000000000000000000 (N)

32 digits separated by hyphens: 00000000-0000-0000-0000-000000000000 (D)

32 digits separated by hyphens, enclosed in braces: {00000000-0000-0000-0000-000000000000} (B)

32 digits separated by hyphens, enclosed in parentheses: (00000000-0000-0000-0000-000000000000) (P)

Four hexadecimal values enclosed in braces, where the fourth value is a subset of eight hexadecimal values that is also enclosed in braces: {0x00000000,0x0000,0x0000,{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00}} (X)

—MSDN

回答2:

You should simply rely upon it being 32 hexadecimal characters, there can be a variety of ways to present it. Check the Wikipedia article for more information, including a description of how they are commonly written.

For your conversion you should really rely on the static Guid.Parse() methods. Using a mix of your example and the ones in icktoofay's answer, this works nicely:

        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 for outputting them with or without hyphens etc you can use the Guid.ToString() method with one of the established format codes.

回答3:

Most of the time, GUIDS are 32-character hexadecimal strings such as {21EC2020-3AEA-1069-A2DD-08002B30309D} (unless they're encoded in Base-64), and are usually stored as a 128-bit integers. They won't always have hyphens, though.

来源：https://stackoverflow.com/questions/7775439/is-the-format-of-guid-always-the-same

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