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EdmSchemaAttribute Class

Attribute that indicates that the assembly contains classes that are mapped to entity types in a conceptual model.

Namespace:  System.Data.Objects.DataClasses
Assembly:  System.Data.Entity (in System.Data.Entity.dll)

[AttributeUsageAttribute(AttributeTargets.Assembly|AttributeTargets.Class, AllowMultiple = true)]
public sealed class EdmSchemaAttribute : Attribute

This attribute is applied to an assembly that contains entity types. It is only required to be applied once, but it may be applied multiple times. When it is applied multiple times to a single assembly in a Visual Basic project, the EdmSchemaAttribute constructor must be used to supply a GUID string value that is unique for each Entity Data Model (EDM) referenced by the assembly.

When using custom data classes with an EDM, you must manually apply attributes. For more information, see Object-Entity Mapping Attributes (Entity Framework).


Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5 SP1