The DHCP_OPTION_DATA_ELEMENT structure contains the type of the option and its data value. This is used within a DHCP_OPTION_DATA (section 2.2.1.2.24) structure.

typedef struct _DHCP_OPTION_DATA_ELEMENT {
  DHCP_OPTION_DATA_TYPE OptionType;
  [switch_is(OptionType), switch_type(DHCP_OPTION_DATA_TYPE)] 
    union _DHCP_OPTION_ELEMENT_UNION {
    [case(DhcpByteOption)] 
      BYTE ByteOption;
    [case(DhcpWordOption)] 
      WORD WordOption;
    [case(DhcpDWordOption)] 
      DWORD DWordOption;
    [case(DhcpDWordDWordOption)] 
      DWORD_DWORD DWordDWordOption;
    [case(DhcpIpAddressOption)] 
      DHCP_IP_ADDRESS IpAddressOption;
    [case(DhcpStringDataOption)] 
      LPWSTR StringDataOption;
    [case(DhcpBinaryDataOption)] 
      DHCP_BINARY_DATA BinaryDataOption;
    [case(DhcpEncapsulatedDataOption)] 
      DHCP_BINARY_DATA EncapsulatedDataOption;
    [case(DhcpIpv6AddressOption)] 
      LPWSTR Ipv6AddressDataOption;
  } Element;
} DHCP_OPTION_DATA_ELEMENT, 
 *LPDHCP_OPTION_DATA_ELEMENT;

OptionType: This is of type DHCP_OPTION_DATA_TYPE (section 2.2.1.1.10) enumeration value, indicating the option value that is present in the subsequent field, Element.

Element: This is a union that can contain one of the following values chosen based on the value of OptionType.

ByteOption: Specifies the data as a BYTE value. This field is present if the OptionType is DhcpByteOption.

WordOption: Specifies the data as a WORD value. This field is present if the OptionType is DhcpWordOption.

DWordOption: Specifies the data as a DWORD value. This field is present if the OptionType is DhcpDWordOption.

DWordDWordOption: Specifies the data as a DWORD_DWORD (section 2.2.1.2.22) value. This field is present if the OptionType is DhcpDWordDWordOption.

IpAddressOption: Specifies the data as a DHCP_IP_ADDRESS (section 2.2.1.2.1) value. This field is present if the OptionType is IpAddressOption.

StringDataOption: Specifies the data as a Unicode string value. This field is present if the OptionType is DhcpStringDataOption.

BinaryDataOption: Specifies the data as a DHCP_BINARY_DATA (section 2.2.1.2.9) structure. This field is present if the OptionType is DhcpBinaryDataOption.

EncapsulatedDataOption: Specifies the data as encapsulated within a DHCP_BINARY_DATA structure. The application MUST recognize the format of the opaque data capsule in order to read it from the Data field of DHCP_BINARY_DATA. This field is present if the OptionType is DhcpEncapsulatedDataOption.

Ipv6AddressDataOption: Specifies the data as a Unicode string value. This field is present if the OptionType is DhcpIpv6AddressOption.