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UnionCodeGroup Class

Represents a code group whose policy statement is the union of the current code group's policy statement and the policy statement of all its matching child code groups. This class cannot be inherited.

Namespace:  System.Security.Policy
Assembly:  mscorlib (in mscorlib.dll)

public sealed class UnionCodeGroup : CodeGroup

Code groups are the building blocks of code access security policy. Each policy level consists of a root code group that can have child code groups (and so on), forming a tree. Each code group has a membership condition that determines if a given assembly belongs to it or not, based on the evidence for that assembly. Only code groups whose membership conditions match a given assembly and their child code groups apply policy.

UnionCodeGroup is the most common type of code group; the policy statement of all matching child code groups (and by extension their child code groups) are combined with the permission set of the matching parent code group. Thus, if its membership condition matches, this code group forms the union of its policy statement and those of all its child code groups that also match the evidence.

UnionCodeGroup code groups are the code groups created by the CASPOL utility (see Code Access Security Policy Tool (Caspol.exe)) and the .NET Framework Configuration tool (see .NET Framework Configuration Tool (Mscorcfg.msc)).


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

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

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.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0