PostgreSQL to .NET type mapping

Type mapping rules from this table are used when generating a model from a database with Entity Data Model Wizard in Visual Studio 2008 - 2022 and Create Model Wizard in Entity Developer.

PostgreSQL data types	SSDL1	CSDL1	.NET
boolean	boolean	Boolean	System.Boolean
smallint, int2	smallint	Int16	System.Int16
integer, int4	int	Int32	System.Int32
bigint, int8	bigint	Int64	System.Int64
real	real	Single	System.Single
double precision, money	double precision	Double	System.Double
numeric, decimal, float	numeric, decimal, float	Decimal	System.Decimal
date, timestamp, timestamp with time zone, timestamp without time zone	date, timestamp, timestamptz	DateTime	System.DateTime
time, time with time zone, time without time zone, interval	time, timetz, interval	Time	System.TimeSpan
timestamp with time zone	datetimeoffset	DateTimeOffset	System.DateTimeOffset
char, varchar, text, citext, enum, bit, varbit, cidr, inet, macaddr, point, line, lseg, box, path, polygon, circle, xml*, character, character varying, bit varying, json, jsonb	char, varchar, text, citext, enum, bit, varbit, cidr, inet, macaddr, point, line, lseg, box, path, polygon, circle, xml, json, jsonb	String	System.String
bytea	bytea	Binary	System.Byte[]
uuid2	uuid	Guid	System.Guid
geometry3	spatial_geometry	Geometry, GeometryCollection, GeometryLineString, GeometryMultiLineString, GeometryMultiPoint, GeometryMultiPolygon, GeometryPoint, GeometryPolygon	System.Data.Spatial.DbGeometry
geography3	spatial_geography	Geography, GeographyCollection, GeographyLineString, GeographyMultiLineString, GeographyMultiPoint, GeographyMultiPolygon, GeographyPoint, GeographyPolygon	System.Data.Spatial.DbGeography

¹ Note that when mapping corresponding database data type, you will need the .NET type with larger precision. That is because, for example, any Int32 value can be stored in the NUMBER(10) column, but largest NUMBER(10) column value cannot be stored in the Int32 field, it requires Int64 field.

² Uuid and xml data types appeared in PostgreSQL 8.3.

³ Supported in Entity Framework v5 and v6.

.NET to PostgreSQL default type mapping

.NET	CSDL1	SSDL1	PostgreSQL data types
System.Boolean	Boolean	boolean	boolean
System.Byte	Byte	byte	smallint
System.Byte[]	Binary	bytea	bytea
System.Data.Spatial.DbGeometry2	Geometry	spatial_geometry	geometry
System.Data.Spatial.DbGeography2	Geography	spatial_geography	geography
System.DateTime	DateTime	timestamp	timestamp
System.DateTimeOffset	DateTimeOffset	datetimeoffset	timestamp with time zone
System.Decimal	Decimal	numeric	numeric
System.Double	Double	double precision	double precision
System.Guid	Guid	uuid	uuid
System.Int16	Int16	smallint	smallint
System.Int32	Int32	int	integer
System.Int64	Int64	bigint	bigint
System.SByte	SByte	sbyte	smallint
System.Single	Single	real	real
System.String	String	char, varchar	char, varchar
System.TimeSpan	Time	timestamp	timestamp

¹ Note that when mapping corresponding database data type, you will need the .NET type with larger precision. That is because, for example, any Int32 value can be stored in the NUMBER(10) column, but largest NUMBER(10) column value cannot be stored in the Int32 field, it requires Int64 field.

² Supported in Entity Framework v5 and v6.