AF SDK Reference

AFAdmin.EnableExternalDataTablesAllowNonImpersonatedUsers Method

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AFAdmin.EnableExternalDataTablesAllowNonImpersonatedUsers Method

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Last UpdatedNov 18, 2025
3 minute read

Enables support for an AFTable to link to an external source with non-impersonated users.

Namespace: OSIsoft.AF.Diagnostics
Assembly: OSIsoft.AFSDK (in OSIsoft.AFSDK.dll) Version: 3.1.1.1182

Syntax

public static void EnableExternalDataTablesAllowNonImpersonatedUsers(
	PISystem system,
	bool enable
)

Public Shared Sub EnableExternalDataTablesAllowNonImpersonatedUsers ( 
	system As PISystem,
	enable As Boolean
)

Dim system As PISystem
Dim enable As Boolean

AFAdmin.EnableExternalDataTablesAllowNonImpersonatedUsers(system, 
	enable)

public:
static void EnableExternalDataTablesAllowNonImpersonatedUsers(
	PISystem^ system, 
	bool enable
)

static member EnableExternalDataTablesAllowNonImpersonatedUsers : 
        system : PISystem * 
        enable : bool -> unit

Parameters

system: Type: OSIsoft.AFPISystem
The operation will be performed on the specified PISystem.
enable: Type: SystemBoolean
Specify to allow access to an externally linked AFTable for non-impersonated users; otherwise specify to disable this feature.

Exceptions

Exception	Condition
SecurityException	This exception is thrown when attempting to execute without Admin security rights.
ArgumentNullException	This exception is thrown when attempting to execute on a PISystem that is null or deleted.
NotSupportedException	This exception is thrown when attempting to execute on a PISystem that does not support the AdminFunctionality feature.

Remarks

This method is used to enable or disable the ExternallyLinkedTableWithNonImpersonatedUser feature in the PI AF SQL Server database. This feature controls support for allowing access to an externally linked AFTable for non-impersonated users. If supported, an externally linked AFTable is not required to use client impersonation. See LinkExternal(IDbDataAdapter, Boolean, SecureString) for more details.

Use the PISystem.Supports method to check if the PISystem supports the AdminFunctionality feature.

Security Note
Requires the Admin right to execute.

Notes to Callers
This method will error on servers before AF 2018 R2 (2.10.5).

Version Information

AFSDK

Supported in: 3.1.1, 3.1.0, 3.0.2, 3.0.1, 3.0.0, 2.10.11, 2.10.5

AF SDK Reference