CA2126: Type link demands require inheritance demands

[アーティクル]
11/04/2016

Applies to: Visual Studio Visual Studio for Mac

Note

This article applies to Visual Studio 2017. If you're looking for the latest Visual Studio documentation, see Visual Studio documentation. We recommend upgrading to the latest version of Visual Studio. Download it here

Item	Value
RuleId	CA2126
Category	Microsoft.Security
Breaking change	Breaking

Cause

A public unsealed type is protected with a link demand, has an overridable method, and neither the type nor the method is protected with an inheritance demand.

Note

This rule has been deprecated. For more information, see Deprecated rules.

Rule description

A link demand on a method or its declaring type requires the immediate caller of the method to have the specified permission. An inheritance demand on a method requires an overriding method to have the specified permission. An inheritance demand on a type requires a deriving class to have the specified permission.

How to fix violations

To fix a violation of this rule, secure the type or the method with an inheritance demand for the same permission as the link demand.

When to suppress warnings

Do not suppress a warning from this rule.

Example

The following example shows a type that violates the rule.

Imports System
Imports System.Security.Permissions

Namespace SecurityLibrary

    <EnvironmentPermission(SecurityAction.LinkDemand, Read:="PATH")> _
    Public Class TypesWithLinkDemands
    
        Protected Overridable Sub UnsecuredMethod()
        End Sub

        <EnvironmentPermission(SecurityAction.InheritanceDemand, Read:="PATH")> _
        Protected Overridable Sub SecuredMethod()
        End Sub
        
    End Class
    
End Namespace

using System;
using System.Security.Permissions;

namespace SecurityLibrary
{
   [EnvironmentPermission(SecurityAction.LinkDemand, Read = "PATH")]
   public class TypesWithLinkDemands
   {
      public virtual void UnsecuredMethod() {}

      [EnvironmentPermission(SecurityAction.InheritanceDemand, Read = "PATH")]
      public virtual void SecuredMethod() { }
   }
}

CA2108: Review declarative security on value types

CA2112: Secured types should not expose fields

CA2122: Do not indirectly expose methods with link demands

CA2123: Override link demands should be identical to base