EnvironmentPermissionAttribute Class
Allows security actions for EnvironmentPermission to be applied to code using declarative security. This class cannot be inherited.
For a list of all members of this type, see EnvironmentPermissionAttribute Members.
System.Object
System.Attribute
System.Security.Permissions.SecurityAttribute
System.Security.Permissions.CodeAccessSecurityAttribute
System.Security.Permissions.EnvironmentPermissionAttribute
[Visual Basic] <AttributeUsage(AttributeTargets.Assembly Or AttributeTargets.Class _ Or AttributeTargets.Struct Or AttributeTargets.Constructor Or _ AttributeTargets.Method)> <Serializable> NotInheritable Public Class EnvironmentPermissionAttribute Inherits CodeAccessSecurityAttribute [C#] [AttributeUsage(AttributeTargets.Assembly | AttributeTargets.Class | AttributeTargets.Struct | AttributeTargets.Constructor | AttributeTargets.Method)] [Serializable] public sealed class EnvironmentPermissionAttribute : CodeAccessSecurityAttribute [C++] [AttributeUsage(AttributeTargets::Assembly | AttributeTargets::Class | AttributeTargets::Struct | AttributeTargets::Constructor | AttributeTargets::Method)] [Serializable] public __gc __sealed class EnvironmentPermissionAttribute : public CodeAccessSecurityAttribute [JScript] public AttributeUsage(AttributeTargets.Assembly | AttributeTargets.Class | AttributeTargets.Struct | AttributeTargets.Constructor | AttributeTargets.Method) Serializable class EnvironmentPermissionAttribute extends CodeAccessSecurityAttribute
Thread Safety
Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
Remarks
The scope of the declaration that is allowed depends on the SecurityAction that is used.
The security information declared by a security attribute is stored in the metadata of the attribute target and is accessed by the system at run time. Security attributes are used only for declarative security. For imperative security, use the corresponding permission class.
Environment variable names are case-insensitive. Multiple environment variable names are specified by separating the names using PathSeparator.
Example
[Visual Basic, C#, C++] The following example of a declarative attribute shows the correct way to request EnvironmentPermission for the ability to read the specified environment variables and states that you must have at least this permission to run your code.
[Visual Basic] <Assembly: EnvironmentPermissionAttribute(SecurityAction.RequestMinimum, _ Read := "COMPUTERNAME;USERNAME;USERDOMAIN")> 'In Visual Basic, you must specify that you are using the assembly scope when making a request. [C#] [assembly:EnvironmentPermissionAttribute(SecurityAction.RequestMinimum, Read="COMPUTERNAME;USERNAME;USERDOMAIN")] //In C#, you must specify that you are using the assembly scope when making a request. [C++] [assembly:EnvironmentPermissionAttribute(SecurityAction::RequestMinimum, Read=S"COMPUTERNAME;USERNAME;USERDOMAIN")]; //In C++, you must specify that you are using the assembly scope when making a request.
[Visual Basic, C#, C++] The following example shows how to demand that the calling code has EnvironmentPermission at link time. Demands are typically made in managed libraries (DLLs) to help protect methods or classes from potentially harmful code.
[Visual Basic] <EnvironmentPermission(SecurityAction.Demand, Unrestricted := True)> _ Public Class SampleClass [C#] [EnvironmentPermissionAttribute(SecurityAction.Demand, Unrestricted=true)] [C++] [EnvironmentPermissionAttribute(SecurityAction::Demand, Unrestricted=true)]
[JScript] No example is available for JScript. To view a Visual Basic, C#, or C++ example, click the Language Filter button
in the upper-left corner of the page.
Requirements
Namespace: System.Security.Permissions
Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family
Assembly: Mscorlib (in Mscorlib.dll)
See Also
EnvironmentPermissionAttribute Members | System.Security.Permissions Namespace | Extending Metadata Using Attributes | EnvironmentPermission | EnvironmentPermissionAccess