C# RuntimeMethodHandle.CheckLinktimeDemands方法代码示例

 internal static unsafe object[] GetCustomAttributes(Module decoratedModule, int decoratedMetadataToken, int pcaCount, RuntimeType attributeFilterType, bool mustBeInheritable, IList derivedAttributes)
 {
     if (decoratedModule.Assembly.ReflectionOnly)
     {
         throw new InvalidOperationException(Environment.GetResourceString("Arg_ReflectionOnlyCA"));
     }
     MetadataImport metadataImport = decoratedModule.MetadataImport;
     CustomAttributeRecord[] customAttributeRecords = CustomAttributeData.GetCustomAttributeRecords(decoratedModule, decoratedMetadataToken);
     Type elementType = (((attributeFilterType == null) || attributeFilterType.IsValueType) || attributeFilterType.ContainsGenericParameters) ? typeof(object) : attributeFilterType;
     if ((attributeFilterType == null) && (customAttributeRecords.Length == 0))
     {
         return (Array.CreateInstance(elementType, 0) as object[]);
     }
     object[] attributes = Array.CreateInstance(elementType, customAttributeRecords.Length) as object[];
     int length = 0;
     SecurityContextFrame frame = new SecurityContextFrame();
     frame.Push(decoratedModule.Assembly.InternalAssembly);
     Assembly lastAptcaOkAssembly = null;
     for (int i = 0; i < customAttributeRecords.Length; i++)
     {
         bool flag2;
         bool flag3;
         object obj2 = null;
         CustomAttributeRecord caRecord = customAttributeRecords[i];
         RuntimeMethodHandle ctor = new RuntimeMethodHandle();
         RuntimeType attributeType = null;
         int namedArgs = 0;
         IntPtr signature = caRecord.blob.Signature;
         IntPtr blobEnd = (IntPtr) (((void*) signature) + caRecord.blob.Length);
         if (FilterCustomAttributeRecord(caRecord, metadataImport, ref lastAptcaOkAssembly, decoratedModule, decoratedMetadataToken, attributeFilterType, mustBeInheritable, attributes, derivedAttributes, out attributeType, out ctor, out flag2, out flag3))
         {
             if (!ctor.IsNullHandle())
             {
                 ctor.CheckLinktimeDemands(decoratedModule, decoratedMetadataToken);
             }
             RuntimeConstructorInfo.CheckCanCreateInstance(attributeType, flag3);
             if (flag2)
             {
                 obj2 = CreateCaObject(decoratedModule, ctor, ref signature, blobEnd, out namedArgs);
             }
             else
             {
                 obj2 = attributeType.TypeHandle.CreateCaInstance(ctor);
                 if (Marshal.ReadInt16(signature) != 1)
                 {
                     throw new CustomAttributeFormatException();
                 }
                 signature = (IntPtr) (((void*) signature) + 2);
                 namedArgs = Marshal.ReadInt16(signature);
                 signature = (IntPtr) (((void*) signature) + 2);
             }
             for (int j = 0; j < namedArgs; j++)
             {
                 string str;
                 bool flag4;
                 Type type3;
                 object obj3;
                 IntPtr ptr1 = caRecord.blob.Signature;
                 GetPropertyOrFieldData(decoratedModule, ref signature, blobEnd, out str, out flag4, out type3, out obj3);
                 try
                 {
                     if (flag4)
                     {
                         if ((type3 == null) && (obj3 != null))
                         {
                             type3 = (obj3.GetType() == typeof(RuntimeType)) ? typeof(Type) : obj3.GetType();
                         }
                         RuntimePropertyInfo property = null;
                         if (type3 == null)
                         {
                             property = attributeType.GetProperty(str) as RuntimePropertyInfo;
                         }
                         else
                         {
                             property = attributeType.GetProperty(str, type3, Type.EmptyTypes) as RuntimePropertyInfo;
                         }
                         RuntimeMethodInfo setMethod = property.GetSetMethod(true) as RuntimeMethodInfo;
                         if (setMethod.IsPublic)
                         {
                             setMethod.MethodHandle.CheckLinktimeDemands(decoratedModule, decoratedMetadataToken);
                             setMethod.Invoke(obj2, BindingFlags.Default, null, new object[] { obj3 }, null, true);
                         }
                     }
                     else
                     {
                         (attributeType.GetField(str) as RtFieldInfo).InternalSetValue(obj2, obj3, BindingFlags.Default, Type.DefaultBinder, null, false);
                     }
                 }
                 catch (Exception exception)
                 {
                     throw new CustomAttributeFormatException(string.Format(CultureInfo.CurrentUICulture, Environment.GetResourceString(flag4 ? "RFLCT.InvalidPropFail" : "RFLCT.InvalidFieldFail"), new object[] { str }), exception);
                 }
             }
             if (!signature.Equals(blobEnd))
             {
                 throw new CustomAttributeFormatException();
             }
             attributes[length++] = obj2;
         }
     }
//.........这里部分代码省略.........

        internal unsafe static object[] GetCustomAttributes(
            Module decoratedModule, int decoratedMetadataToken, int pcaCount, 
            RuntimeType attributeFilterType, bool mustBeInheritable, IList derivedAttributes)
        {
            if (decoratedModule.Assembly.ReflectionOnly)
                throw new InvalidOperationException(Environment.GetResourceString("Arg_ReflectionOnlyCA"));

            MetadataImport scope = decoratedModule.MetadataImport;
            CustomAttributeRecord[] car = CustomAttributeData.GetCustomAttributeRecords(decoratedModule, decoratedMetadataToken);

            bool useObjectArray = (attributeFilterType == null || attributeFilterType.IsValueType || attributeFilterType.ContainsGenericParameters);
            Type arrayType = useObjectArray ? typeof(object) : attributeFilterType;

            if (attributeFilterType == null && car.Length == 0)
                return Array.CreateInstance(arrayType, 0) as object[];

            object[] attributes = Array.CreateInstance(arrayType, car.Length) as object[];
            int cAttributes = 0;

            // Custom attribute security checks are done with respect to the assembly *decorated* with the 
            // custom attribute as opposed to the *caller of GetCustomAttributes*.
            // Since this assembly might not be on the stack and the attribute ctor or property setters we're about to invoke may
            // make security demands, we push a frame on the stack as a proxy for the decorated assembly (this frame will be picked
            // up an interpreted by the security stackwalker).
            // Once we push the frame it will be automatically popped in the event of an exception, so no need to use CERs or the
            // like.
            SecurityContextFrame frame = new SecurityContextFrame();
            frame.Push(decoratedModule.Assembly);

            // Optimization for the case where attributes decorate entities in the same assembly in which case 
            // we can cache the successful APTCA check between the decorated and the declared assembly.
            Assembly lastAptcaOkAssembly = null;
            
            for (int i = 0; i < car.Length; i++)
            {
                object attribute = null;
                CustomAttributeRecord caRecord = car[i];

                RuntimeMethodHandle ctor = new RuntimeMethodHandle();
                RuntimeType attributeType = null;
                bool ctorHasParameters, isVarArg;
                int cNamedArgs = 0;
                
                IntPtr blobStart = caRecord.blob.Signature;
                IntPtr blobEnd = (IntPtr)((byte*)blobStart + caRecord.blob.Length);
                
                if (!FilterCustomAttributeRecord(caRecord, scope, ref lastAptcaOkAssembly, 
                                                 decoratedModule, decoratedMetadataToken, attributeFilterType, mustBeInheritable, 
                                                 attributes, derivedAttributes,
                                                 out attributeType, out ctor, out ctorHasParameters, out isVarArg))
                    continue;

                if (!ctor.IsNullHandle())
                {
                    // Linktime demand checks 
                    // decoratedMetadataToken needed as it may be "transparent" in which case we do a full stack walk
                    ctor.CheckLinktimeDemands(decoratedModule, decoratedMetadataToken);
                }
                else
                {
                }

                // Leverage RuntimeConstructorInfo standard .ctor verfication
                RuntimeConstructorInfo.CheckCanCreateInstance(attributeType, isVarArg); 

                // Create custom attribute object
                if (ctorHasParameters)
                {
                    attribute = CreateCaObject(decoratedModule, ctor, ref blobStart, blobEnd, out cNamedArgs); 
                }
                else
                {
                    attribute = attributeType.TypeHandle.CreateCaInstance(ctor);

                    if (Marshal.ReadInt16(blobStart) != 1)
                        throw new CustomAttributeFormatException();
                    blobStart = (IntPtr)((byte*)blobStart + 2); // skip 0x0001 prefix

                    cNamedArgs = Marshal.ReadInt16(blobStart);
                    blobStart = (IntPtr)((byte*)blobStart + 2); // skip namedArgs count
                }

                for (int j = 0; j < cNamedArgs; j++)
                {
                    #region // Initialize named properties and fields
                    string name;
                    bool isProperty;
                    Type type;
                    object value;
                    
                    IntPtr blobItr = caRecord.blob.Signature;

                    GetPropertyOrFieldData(decoratedModule, ref blobStart, blobEnd, out name, out isProperty, out type, out value);

                    try
                    {
                        if (isProperty)
                        {
                            #region // Initialize property
                            if (type == null && value != null)
//.........这里部分代码省略.........