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View this topic on docs.devexpress.com (Learn more)

EFDataSource.BeforeLoadCustomAssemblyGlobal Event

Occurs on an attempt to load a custom assembly by EFDataSource (e.g., when an application loads a report template containing an Entity Framework data source originated from a compiled assembly).

Namespace:DevExpress.DataAccess.EntityFramework
Assembly:DevExpress.DataAccess.v19.1.dll

Expanded Syntax

Expanded Event Data

The event handler receives an argument of type BeforeLoadCustomAssemblyEventArgs containing data related to this event.

The following BeforeLoadCustomAssemblyEventArgs properties provide information specific to this event.
Property Description
AllowLoading Specifies whether loading a custom assembly is allowed.
AssemblyPath Specifies the path to a requested assembly.
ContextName Specifies the type to load from a custom assembly.

Expanded Remarks

Loading of custom assemblies that may be referenced by Entity Framework data sources is forbidden by default.

To permit loading a specific assembly, handle the BeforeLoadCustomAssembly event (or static BeforeLoadCustomAssemblyGlobal event) and specify the following properties of the BeforeLoadCustomAssemblyEventArgs object.

An unauthorized attempt to load a custom assembly will result in throwing a CustomAssemblyLoadingProhibitedException.

In the Data Source wizard, the corresponding option is disabled so that end-users are only allowed to select a data context from assemblies referenced by the project.

To make the Browse button visible, set the EFWizardSettings.ShowBrowseButton property to true.

Expanded See Also

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