AddInSecurityLevel Enumeration


Specifies the trust level that is granted to the application domain that an add-in is loaded into.

Namespace:   System.AddIn.Hosting
Assembly:  System.AddIn (in System.AddIn.dll)

Public Enumeration AddInSecurityLevel

Member nameDescription

Use the full trust security level for add-ins that are allowed to read and write to the local file system, create network connections, and read from the registry. This security level grants full access to the add-in's code access security (CAS) by applying the Unrestricted field.


Use the host security level to give the add-in the same permissions currently granted to the hosting code.


Use the Internet security level for add-ins that have a low trust level.


Use the Intranet security level for add-ins that are located on a company's intranet. These add-ins can have a greater trust level because the servers and information are within a company's firewall.

The add-in system activates the add-in with the permission set that corresponds to the trust level specified for the add-in's application domain. That permission set is defined by the common language runtime's code access security (CAS) configuration.

The values of this enumeration cannot be combined by using the bitwise OR operation.

The following example activates an add-in with a specified trust level.

'Ask the user which add-in they would like to use.
Dim selectedToken As AddInToken = ChooseAddIn(tokens)
'Activate the selected AddInToken in a new
'application domain with the Internet trust level.
Dim CalcAddIn As Calculator = selectedToken.Activate(Of Calculator)(AddInSecurityLevel.Internet)
'Run the add-in using a custom method.

.NET Framework
Available since 3.5
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