EntityConnection.Open EntityConnection.Open EntityConnection.Open EntityConnection.Open Method

Definition

Establishes a connection to the data source by calling the underlying data provider's Open method.

public:
 override void Open();
public override void Open ();
override this.Open : unit -> unit
Public Overrides Sub Open ()

Exceptions

An error occurs when you open the connection, or the name of the underlying data provider is not known.

The inline connection string contains an invalid Metadata keyword value.

Remarks

To avoid inadvertently putting objects such as System.Data.Common.CommandTrees and ObjectContext out of sync with their metadata, EntityConnection must lock its metadata. No changes to the connection string are allowed after the metadata is locked. The following are two scenarios in which metadata is locked:

When metadata is loaded, the EntityConnection verifies that the conceptual model, the storage model, and the mapping file are all present.

Applies to