ToString() [3/3]

string System.Guid.ToString ( string? format, IFormatProvider? provider )

inline

Implements System.IFormattable.

Definition at line 884 of file Guid.cs.

    {
        if (string.IsNullOrEmpty(format))
        {
            format = "D";
        }
        if (format.Length != 1)
        {
            throw new FormatException(SR.Format_InvalidGuidFormatSpecification);
        }
        int length;
        switch (format[0])
        {
        case 'D':
        case 'd':
            length = 36;
            break;
        case 'N':
        case 'n':
            length = 32;
            break;
        case 'B':
        case 'P':
        case 'b':
        case 'p':
            length = 38;
            break;
        case 'X':
        case 'x':
            length = 68;
            break;
        default:
            throw new FormatException(SR.Format_InvalidGuidFormatSpecification);
        }
        string text = string.FastAllocateString(length);
        int charsWritten;
        bool flag = TryFormat(new Span<char>(ref text.GetRawStringData(), text.Length), out charsWritten, format);
        return text;
    }

References System.format, System.SR.Format_InvalidGuidFormatSpecification, System.length, System.text, and System.Guid.TryFormat().