EdmFunctionAttribute Class

.NET Framework (current version)

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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)


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

System_CAPS_pubmethodEdmFunctionAttribute(String, String)

Initializes a new instance of the EdmFunctionAttribute class.


The name of the mapped-to function.


The namespace of the mapped-to function.


When implemented in a derived class, gets a unique identifier for this Attribute.(Inherited from Attribute.)


This API supports the product infrastructure and is not intended to be used directly from your code. Returns a value that indicates whether this instance is equal to a specified object.(Inherited from Attribute.)


Returns the hash code for this instance.(Inherited from Attribute.)


Gets the Type of the current instance.(Inherited from Object.)


When overridden in a derived class, indicates whether the value of this instance is the default value for the derived class.(Inherited from Attribute.)


When overridden in a derived class, returns a value that indicates whether this instance equals a specified object.(Inherited from Attribute.)


Returns a string that represents the current object.(Inherited from Object.)

System_CAPS_pubinterfaceSystem_CAPS_privmethod_Attribute.GetIDsOfNames(Guid, IntPtr, UInt32, UInt32, IntPtr)

Maps a set of names to a corresponding set of dispatch identifiers.(Inherited from Attribute.)

System_CAPS_pubinterfaceSystem_CAPS_privmethod_Attribute.GetTypeInfo(UInt32, UInt32, IntPtr)

Retrieves the type information for an object, which can be used to get the type information for an interface.(Inherited from Attribute.)


Retrieves the number of type information interfaces that an object provides (either 0 or 1).(Inherited from Attribute.)

System_CAPS_pubinterfaceSystem_CAPS_privmethod_Attribute.Invoke(UInt32, Guid, UInt32, Int16, IntPtr, IntPtr, IntPtr, IntPtr)

Provides access to properties and methods exposed by an object.(Inherited from Attribute.)

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 Conceptual Model Types (CSDL).

.NET Framework
Available since 4.0

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

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