SqlServer与.NET的数据类型映射关系图

关系表

SQL Server 数据库引擎类型	.NET Framework 类型	SqlDbType 枚举	SqlDataReader SqlTypes 类型化访问器	DbType 枚举	SqlDataReader DbType 类型化访问器
bigint	Int64	BigInt	GetSqlInt64	Int64	GetInt64
binary	Byte[]	VarBinary	GetSqlBinary	Binary	GetBytes
bit	Boolean	Bit	GetSqlBoolean	Boolean	GetBoolean
char	String Char[]	Char	GetSqlString	AnsiStringFixedLength, String	GetString GetChars
date （仅适用 SQL Server 2008）	DateTime	Date	GetSqlDateTime	Date	GetDateTime
datetime	DateTime	DateTime	GetSqlDateTime	DateTime	GetDateTime
datetime2 （仅适用 SQL Server 2008）	DateTime2	DateTime2	GetSqlDateTime	DateTime2	GetDateTime
datetimeoffset （仅适用 SQL Server 2008）	DateTimeOffset	DateTimeOffset	none	DateTimeOffset	GetDateTimeOffset
decimal	Decimal	Decimal	GetSqlDecimal	Decimal	GetDecimal
FILESTREAM 属性 (varbinary(max)	Byte[]	VarBinary	GetSqlBytes	Binary	GetBytes
float	Double	Float	GetSqlDouble	Double	GetDouble
image	Byte[]	Binary	GetSqlBinary	Binary	GetBytes
int	Int32	Int	GetSqlInt32	Int32	GetInt32
money	Decimal	Money	GetSqlMoney	Decimal	GetDecimal
nchar	String Char[]	NChar	GetSqlString	StringFixedLength	GetString GetChars
ntext	String Char[]	NText	GetSqlString	String	GetString GetChars
numeric	Decimal	Decimal	GetSqlDecimal	Decimal	GetDecimal
nvarchar	String Char[]	NVarChar	GetSqlString	String	GetString GetChars
real	Single	Real	GetSqlSingle	Single	GetFloat
rowversion	Byte[]	Timestamp	GetSqlBinary	Binary	GetBytes
smalldatetime	DateTime	DateTime	GetSqlDateTime	DateTime	GetDateTime
smallint	Int16	SmallInt	GetSqlInt16	Int16	GetInt16
smallmoney	Decimal	SmallMoney	GetSqlDecimal	Decimal	GetDecimal
sql_variant	Object*	Variant	GetSqlValue *	Object	GetValue *
text	String Char[]	Text	GetSqlString	String	GetString GetChars
time （仅适用 SQL Server 2008）	TimeSpan	Time	none	Time	GetDateTime
timestamp	Byte[]	Timestamp	GetSqlBinary	Binary	GetBytes
tinyint	Byte	TinyInt	GetSqlByte	Byte	GetByte
uniqueidentifier	Guid	UniqueIdentifier	GetSqlGuid	Guid	GetGuid
varbinary	Byte[]	VarBinary	GetSqlBinary	Binary	GetBytes
varchar	String Char[]	VarChar	GetSqlString	AnsiString, String	GetString GetChars
xml	Xml	Xml	GetSqlXml	Xml	none