MetaDataMember.IsPrimaryKey Property

Definition

Namespace:

System.Data.Linq.Mapping

Assembly:

System.Data.Linq.dll

When overridden in a derived class, gets a value that indicates whether this member is part of the type's identity.

C#

public abstract bool IsPrimaryKey { get; }

Property Value

Boolean

true if this member is part of the type's identity; otherwise, false.

Remarks

If this property is true, the class member represents a column that is part of the table's unique key. More than one member of the class can have this property set to true for a key that is a composite of the associated columns. For an entity class, at least one member must have this attribute and should be mapped to the primary key or a unique key in the corresponding table or view. Otherwise, LINQ to SQL considers instances of the class as read-only for the purpose of submitting changes to the database.

The set of columns identified with IsPrimaryKey are not required to be the primary key. They simply denote a set that uniquely identifies the entity. Common alternatives include clustering index columns or other unique key columns.

Applies to