EvidenceBase.cs

using System.IO;
using System.Runtime.InteropServices;
using System.Runtime.Serialization.Formatters.Binary;
using System.Security.Permissions;

namespace System.Security.Policy
{
    [Serializable]
    [ComVisible(true)]
    [PermissionSet(SecurityAction.InheritanceDemand, Unrestricted = true)]
    public abstract class EvidenceBase
    {
        protected EvidenceBase()
        {
            if (!GetType().IsSerializable)
            {
                throw new InvalidOperationException(Environment.GetResourceString("Policy_EvidenceMustBeSerializable"));
            }
        }

        [SecuritySafeCritical]
        [SecurityPermission(SecurityAction.Assert, SerializationFormatter = true)]
        [PermissionSet(SecurityAction.InheritanceDemand, Unrestricted = true)]
        public virtual EvidenceBase Clone()
        {
            using (MemoryStream memoryStream = new MemoryStream())
            {
                BinaryFormatter binaryFormatter = new BinaryFormatter();
                binaryFormatter.Serialize(memoryStream, this);
                memoryStream.Position = 0L;
                return binaryFormatter.Deserialize(memoryStream) as EvidenceBase;
            }
        }
    }
}