AppDomainEvidenceFactory.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / clr / src / BCL / System / Security / Policy / AppDomainEvidenceFactory.cs / 1305376 / AppDomainEvidenceFactory.cs
                        

                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 

using System; 
using System.Collections.Generic; 
using System.Diagnostics.Contracts;
using System.Reflection; 

namespace System.Security.Policy
{
    ///  
    ///     Factory class which creates evidence on demand for an AppDomain
    ///  
    internal sealed class AppDomainEvidenceFactory : IRuntimeEvidenceFactory 
    {
        private AppDomain m_targetDomain; 
        private Evidence m_entryPointEvidence;

        internal AppDomainEvidenceFactory(AppDomain target)
        { 
            Contract.Assert(target != null);
            Contract.Assert(target == AppDomain.CurrentDomain, "AppDomainEvidenceFactory should not be used across domains."); 
 
            m_targetDomain = target;
        } 

        /// 
        ///     AppDomain this factory generates evidence for
        ///  
        public IEvidenceFactory Target
        { 
            get { return m_targetDomain; } 
        }
 
        /// 
        ///     Return any evidence supplied by the AppDomain itself
        /// 
        public IEnumerable GetFactorySuppliedEvidence() 
        {
            // AppDomains do not contain serialized evidence 
            return new EvidenceBase[] { }; 
        }
 
        /// 
        ///     Generate evidence on demand for an AppDomain
        /// 
        [SecuritySafeCritical] 
        public EvidenceBase GenerateEvidence(Type evidenceType)
        { 
            // For v1.x compatibility, the default AppDomain has the same evidence as the entry point 
            // assembly.  Since other AppDomains inherit their evidence from the default AppDomain by
            // default, they also use the entry point assembly. 
            BCLDebug.Assert(m_targetDomain == AppDomain.CurrentDomain, "AppDomainEvidenceFactory should not be used across domains.");

            if (m_targetDomain.IsDefaultAppDomain())
            { 
                // If we don't already know the evidence for the entry point assembly, get that now.  If we
                // have a RuntimeAssembly go directly to its EvidenceNoDemand property to avoid the full 
                // demand that it will do on access to its Evidence property. 
                if (m_entryPointEvidence == null)
                { 
                    Assembly entryAssembly = Assembly.GetEntryAssembly();
                    RuntimeAssembly entryRuntimeAssembly = entryAssembly as RuntimeAssembly;

                    if (entryRuntimeAssembly != null) 
                    {
                        m_entryPointEvidence = entryRuntimeAssembly.EvidenceNoDemand.Clone(); 
                    } 
                    else if (entryAssembly != null)
                    { 
                        m_entryPointEvidence = entryAssembly.Evidence;
                    }
                }
 
                // If the entry point assembly provided evidence, then we use that for the AppDomain
                if (m_entryPointEvidence != null) 
                { 
                    return m_entryPointEvidence.GetHostEvidence(evidenceType);
                } 
            }
            else
            {
                // If we're not the default domain, then we should inherit our evidence from the default 
                // domain -- so ask it what evidence it has of this type.
                AppDomain defaultDomain = AppDomain.GetDefaultDomain(); 
                return defaultDomain.GetHostEvidence(evidenceType); 
            }
 
            // AppDomains do not generate any evidence on demand
            return null;
        }
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

Link Menu

Network programming in C#, Network Programming in VB.NET, Network Programming in .NET
This book is available now!
Buy at Amazon US or
Buy at Amazon UK