EN
C# / .NET - create GUID value
4 points
In C# / .NET it is possible to create GUID / UUID (Globally Unique Identifier / Universally Unique Identifier) in the following way.
xxxxxxxxxx1
Guid guid = Guid.NewGuid();2
string text = guid.ToString();3
4
Console.WriteLine(text);Output:
xxxxxxxxxx1
805036a5-254b-49f5-aef5-9b66255da3e3xxxxxxxxxx1
Guid guid = Guid.NewGuid();2
byte[] bytes = guid.ToByteArray();3
4
foreach(byte entry in bytes)5
Console.Write(entry + " ");6
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Console.WriteLine();Output:
xxxxxxxxxx1
165 54 80 128 75 37 245 73 174 245 155 102 37 93 163 227xxxxxxxxxx1
Guid guid = new Guid(new byte[]2
{3
0x00, 0x01, 0x02, 0x03,4
0x04, 0x05,5
0x06, 0x07,6
0x08, 0x09,7
0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F8
});9
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Console.WriteLine(guid.ToString());Output:
xxxxxxxxxx1
03020100-0504-0706-0809-0a0b0c0d0e0fNote: order of first 8 bytes is different than in string. It is caused of Microsoft GUID implementation and Little-endian of x86 processors compatibility:
xxxxxxxxxx1
typedef struct _GUID {2
DWORD Data1;3
WORD Data2;4
WORD Data3;5
BYTE Data4[8];6
} GUID;It means DWORD and WORD bytes are reversed.
