4.4.2 アプリケーションのデータ型とデータベースのデータ型の関係

SQLのデータ型に対して、使用できるデータタイプは以下のとおりです。

DbType	NpgsqlDbType	PostgreSQLのデータ型	C#のデータ型	.Net Framework Typeのデータ型
	Char	char	string, char[], char, IConvertible	System.String, System.Char[], System.Char
	Varchar	varchar	string, char[], char, IConvertible	System.String, System.Char[], System.Char
String, StringFixedLength, AnsiString, AnsiStringFixedLength	Text	text	string, char[], char, IConvertible	System.String, System.Char[], System.Char
Binary	Bytea	bytea	byte[], ArraySegment	System.Byte[]
Int16	Smallint	int2	short, IConvertible	System.Int16
Int32	Integer	int4	int, IConvertible	System.Int32
Int64	Bigint	int8	long, IConvertible	System.Int64
Single	Real	float4	float, IConvertible	System.Single
Double	Double	float8	double, IConvertible	System.Double
Decimal, VarNumeric	Numeric	numeric	decimal, IConvertible	System.Decimal
Date	Date	date	DateTime, NpgsqlDate, IConvertible	System.DateTime
	TimeTZ	timetz	DateTimeOffset, DateTime, TimeSpan	System.DateTimeOffset, System.DateTime, System.TimeSpan
Time	Time	time	TimeSpan, string	System.Timespan
DateTime, DateTime2	Timestamp	timestamp	DateTime, DateTimeOffset, NpgsqlDateTime, IConvertible	System.DateTime
DateTimeOffset	TimestampTZ	timestamptz	DateTime, DateTimeOffset, NpgsqlDateTime, IConvertible	System.DateTime
	Interval	interval	TimeSpan, NpgsqlTimeSpan, string	System.TimeSpan
	Boolean	bool	bool, IConvertible	System.Boolean
	Bit	bit	BitArray, bool, string	System.Boolean, System.String
	Uuid	uuid	Guid, string	System.Guid
	Inet	inet	IPAddress, NpgsqlInet	ValueTuple<IPAddress, int>, IPAddress, NpgsqlInet
	MacAddr	macaddr	PhysicalAddress	System.Net.NetworkInformation.PhysicalAddress
	MacAddr8	macaddr8	PhysicalAddress	System.Net.NetworkInformation.PhysicalAddress
	Box	box	NpgsqlBox	NpgsqlBox
	Circle	circle	NpgsqlCircle	NpgsqlCircle
	LSeg	lseg	NpgsqlLSeg	NpgsqlLSeg
	Path	path	NpgsqlPath	NpgsqlPath
	Point	point	NpgsqlPoint	NpgsqlPoint
	Polygon	polygon	NpgsqlPolygon	NpgsqlPolygon
	Array	array types	Array, IList, IList	System.Array