EdmFunctionAttribute Class (System.Data.Objects.DataClasses)

Collapse All

.NET Framework Class Library

EdmFunctionAttribute Class

[This documentation is for preview only, and is subject to change in later releases. Blank topics are included as placeholders.]

An attribute that, when applied to a method, indicates that the method is a proxy for a function in the conceptual model or storage model.

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

Syntax

Visual Basic (Declaration)

<AttributeUsageAttribute(AttributeTargets.Method, Inherited := False, AllowMultiple := False)> _
Public NotInheritable Class EdmFunctionAttribute _
    Inherits Attribute

Visual Basic (Usage)

Dim instance As EdmFunctionAttribute

[AttributeUsageAttribute(AttributeTargets.Method, Inherited = false, AllowMultiple = false)]
public sealed class EdmFunctionAttribute : Attribute

Visual C++

[AttributeUsageAttribute(AttributeTargets::Method, Inherited = false, AllowMultiple = false)]
public ref class EdmFunctionAttribute sealed : public Attribute

[<SealedAttribute>]
[<AttributeUsageAttribute(AttributeTargets.Method, Inherited = false, AllowMultiple = false)>]
type EdmFunctionAttribute =  
    class
        inherit Attribute
    end

Remarks

An EdmFunctionAttribute links a common language runtime (CLR) method to another function. For example, the attribute can be used to map a CLR method to a function that is exposed by the storage provider, to a user-defined function in the database, or to a user-defined function in the conceptual model. Methods that have this attribute can be called from LINQ to Entities queries.

To use an EdmFunctionAttribute to map a CLR method to a function, the following must be true:

The return type of the CLR method must be compatible with the return type of the mapped-to function.
The argument types of the CLR method must be compatible with the argument types of the mapped-to function.

For information about compatible types, see Entity Data Model Types.

Inheritance Hierarchy

System..::.Object
System..::.Attribute
System.Data.Objects.DataClasses..::.EdmFunctionAttribute

Thread Safety

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

Platforms

Windows 7, Windows Vista, Windows XP SP2, 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.

Version Information

.NET Framework

Supported in: 4

.NET Framework Client Profile

Supported in: 4

Reference

EdmFunctionAttribute Members

System.Data.Objects.DataClasses Namespace

Other Resources

How to: Call Custom Database Functions

How to: Call Functions Defined in the Conceptual Model