对于公共的非密封类：
[System.Security.Permissions.PermissionSetAttribute(System.Security. Permissions.SecurityAction.InheritanceDemand, Name="FullTrust")] [System.Security.Permissions.PermissionSetAttribute (System.Security.Permissions.SecurityAction.LinkDemand, Name="FullTrust")] public class CanDeriveFromMe •对于公共的密封类：
[System.Security.Permissions.PermissionSetAttribute (System.Security.Permissions.SecurityAction.LinkDemand, Name="FullTrust")] public sealed class CannotDeriveFromMe •对于公共的抽象类：
[System.Security.Permissions.PermissionSetAttribute (System.Security.Permissions.SecurityAction.InheritanceDemand, Name="FullTrust")] [System.Security.Permissions.PermissionSetAttribute (System.Security.Permissions.SecurityAction.LinkDemand, Name="FullTrust")] public abstract class CannotCreateInstanceOfMe_CanCastToMe •对于公共的虚拟函数：
class Base { [System.Security.Permissions.PermissionSetAttribute (System.Security.Permissions.SecurityAction.InheritanceDemand, Name="FullTrust")] [System.Security.Permissions.PermissionSetAttribute( System.Security.Permissions.SecurityAction.LinkDemand, Name="FullTrust")] public override void CanOverrideOrCallMe() { ... } •对于公共的抽象函数：
class Base { [System.Security.Permissions.PermissionSetAttribute (System.Security.Permissions.SecurityAction.InheritanceDemand, Name="FullTrust")] [System.Security.Permissions.PermissionSetAttribute (System.Security.Permissions.SecurityAction.LinkDemand, Name="FullTrust")] public override void CanOverrideMe() { ... } •对于基函数不需要完全信任的公共重写函数：
class Derived { [System.Security.Permissions.PermissionSetAttribute (System.Security.Permissions.SecurityAction.Demand, Name="FullTrust")] public override void CanOverrideOrCallMe() { ... } •对于基函数需要完全信任的公共重写函数：
class Derived { [System.Security.Permissions.PermissionSetAttribute (System.Security.Permissions.SecurityAction.LinkDemand, Name="FullTrust")] public override void CanOverrideOrCallMe() { ... } •对于公共接口：
[System.Security.Permissions.PermissionSetAttribute (System.Security.Permissions.SecurityAction.InheritanceDemand, Name="FullTrust")] [System.Security.Permissions.PermissionSetAttribute (System.Security.Permissions.SecurityAction.LinkDemand, Name="FullTrust")] public interface CanCastToMe Demand 与 LinkDemand声明性安全提供了两种类似的、但检查方式大不相同的安全检查。花些时间了解这两种形式是值得的，因为错误的选择会导致脆弱的安全性或性能损失。本部分并不打算完整地说明这些功能；有关完整的详细信息，请参阅产品文档。
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