SQL Server 内置数据类型与 DotNet数据类型对应关系

TypeName	DataType	IsAutoIncrementable	IsBestMatch
bigint	System.Int64	TRUE	TRUE
binary	System.Byte[]	FALSE	TRUE
char	System.String	FALSE	TRUE
datetime	System.DateTime	FALSE	TRUE
datetime2	System.DateTime	FALSE	TRUE
datetimeoffset	System.DateTimeOffset	FALSE	TRUE
decimal	System.Decimal	TRUE	TRUE
float	System.Double	FALSE	TRUE
image	System.Byte[]	FALSE	TRUE
int	System.Int32	TRUE	TRUE
nchar	System.String	FALSE	TRUE
ntext	System.String	FALSE	TRUE
numeric	System.Decimal	TRUE	TRUE
nvarchar	System.String	FALSE	TRUE
real	System.Single	FALSE	TRUE
smalldatetime	System.DateTime	FALSE	TRUE
smallint	System.Int16	TRUE	TRUE
sql_variant	System.Object	FALSE	TRUE
text	System.String	FALSE	TRUE
tinyint	System.SByte	TRUE	TRUE
uniqueidentifier	System.Guid	FALSE	TRUE
varbinary	System.Byte[]	FALSE	TRUE
varchar	System.String	FALSE	TRUE