DataContext Constructors
Definition
Important
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Initializes a new instance of the DataContext class. The connection string you use can be an ADO.NET connection string. You can also specify a filename to a SQL Server Express or SQL Server Compact file.
Overloads
| DataContext(IDbConnection) |
Initializes a new instance of the DataContext class by referencing the connection used by the .NET Framework. |
| DataContext(String) |
Initializes a new instance of the DataContext class by referencing a file source. |
| DataContext(IDbConnection, MappingSource) |
Initializes a new instance of the DataContext class by referencing a connection and a mapping source. |
| DataContext(String, MappingSource) |
Initializes a new instance of the DataContext class by referencing a file source and a mapping source. |
DataContext(IDbConnection)
Initializes a new instance of the DataContext class by referencing the connection used by the .NET Framework.
public:
DataContext(System::Data::IDbConnection ^ connection);public DataContext (System.Data.IDbConnection connection);new System.Data.Linq.DataContext : System.Data.IDbConnection -> System.Data.Linq.DataContextPublic Sub New (connection As IDbConnection)Parameters
- connection
- IDbConnection
The connection used by the .NET Framework.
Remarks
A DataContext opens and closes a database connection as needed if you provide a closed connection or a connection string. In general, you should never have to call Dispose on a DataContext. If you provide an open connection, the DataContext will not close it. Therefore, do not instantiate a DataContext with an open connection unless you have a good reason to do this. In a System.Transactions transaction, a DataContext will not open or close a connection to avoid promotion.
Applies to
DataContext(String)
Initializes a new instance of the DataContext class by referencing a file source.
public:
DataContext(System::String ^ fileOrServerOrConnection);public DataContext (string fileOrServerOrConnection);new System.Data.Linq.DataContext : string -> System.Data.Linq.DataContextPublic Sub New (fileOrServerOrConnection As String)Parameters
- fileOrServerOrConnection
- String
This argument can be any one of the following: The name of a file where a SQL Server Express database resides.
The name of a server where a database is present. In this case the provider uses the default database for a user.
A complete connection string. LINQ to SQL just passes the string to the provider without modification.
Applies to
DataContext(IDbConnection, MappingSource)
Initializes a new instance of the DataContext class by referencing a connection and a mapping source.
public:
DataContext(System::Data::IDbConnection ^ connection, System::Data::Linq::Mapping::MappingSource ^ mapping);public DataContext (System.Data.IDbConnection connection, System.Data.Linq.Mapping.MappingSource mapping);new System.Data.Linq.DataContext : System.Data.IDbConnection * System.Data.Linq.Mapping.MappingSource -> System.Data.Linq.DataContextPublic Sub New (connection As IDbConnection, mapping As MappingSource)Parameters
- connection
- IDbConnection
The connection used by the .NET Framework.
- mapping
- MappingSource
A source for mapping.
Applies to
DataContext(String, MappingSource)
Initializes a new instance of the DataContext class by referencing a file source and a mapping source.
public:
DataContext(System::String ^ fileOrServerOrConnection, System::Data::Linq::Mapping::MappingSource ^ mapping);public DataContext (string fileOrServerOrConnection, System.Data.Linq.Mapping.MappingSource mapping);new System.Data.Linq.DataContext : string * System.Data.Linq.Mapping.MappingSource -> System.Data.Linq.DataContextPublic Sub New (fileOrServerOrConnection As String, mapping As MappingSource)Parameters
- fileOrServerOrConnection
- String
This argument can be any one of the following:
The name of a file where a SQL Server Express database resides.
The name of a server where a database is present. In this case the provider uses the default database for a user.
A complete connection string. LINQ to SQL just passes the string to the provider without modification.
- mapping
- MappingSource
A source for mapping.
