C# PropertyInfo.Getter方法代码示例

        private static void FindNextProperty(PropertyInfo property, IList<PropertyInfo> collection, bool getter)
        {
            DebugCheck.NotNull(property);
            DebugCheck.NotNull(collection);

            var method = getter ? property.Getter() : property.Setter();

            if (method != null)
            {
                var nextType = method.DeclaringType.BaseType();
                if (nextType != null && nextType != typeof(object))
                {
                    var baseMethod = method.GetBaseDefinition();

                    var nextProperty =
                        (from p in nextType.GetInstanceProperties()
                         let candidateMethod = getter ? p.Getter() : p.Setter()
                         where candidateMethod != null && candidateMethod.GetBaseDefinition() == baseMethod
                         select p).FirstOrDefault();

                    if (nextProperty != null)
                    {
                        collection.Add(nextProperty);
                        CollectProperties(nextProperty, collection);
                    }
                }
            }
        }

        public bool EmitMember(
            TypeBuilder typeBuilder, EdmMember member, PropertyBuilder propertyBuilder, PropertyInfo baseProperty,
            BaseProxyImplementor baseImplementor)
        {
            if (_members.Contains(member))
            {
                var baseGetter = baseProperty.Getter();
                const MethodAttributes getterAttributes =
                    MethodAttributes.HideBySig | MethodAttributes.SpecialName | MethodAttributes.Virtual;
                var getterAccess = baseGetter.Attributes & MethodAttributes.MemberAccessMask;

                // Define field to store interceptor Func
                // Signature of interceptor Func delegate is as follows:
                //
                //    bool intercept(ProxyType proxy, PropertyType propertyValue)
                //
                // where
                //     PropertyType is the type of the Property, such as ICollection<Customer>,
                //     ProxyType is the type of the proxy object,
                //     propertyValue is the value returned from the proxied type's property getter.

                var interceptorType = typeof(Func<,,>).MakeGenericType(typeBuilder, baseProperty.PropertyType, typeof(bool));
                var interceptorInvoke = TypeBuilder.GetMethod(interceptorType, typeof(Func<,,>).GetOnlyDeclaredMethod("Invoke"));
                var interceptorField = typeBuilder.DefineField(
                    GetInterceptorFieldName(baseProperty.Name), interceptorType, FieldAttributes.Private | FieldAttributes.Static);

                // Define a property getter override in the proxy type
                var getterBuilder = typeBuilder.DefineMethod(
                    "get_" + baseProperty.Name, getterAccess | getterAttributes, baseProperty.PropertyType, Type.EmptyTypes);
                var generator = getterBuilder.GetILGenerator();

                // Emit instructions for the following call:
                //   T value = base.SomeProperty;
                //   if(this._interceptorForSomeProperty(this, value))
                //   {  return value; }
                //   return base.SomeProperty;
                // where _interceptorForSomeProperty represents the interceptor Func field.

                var lableTrue = generator.DefineLabel();
                generator.DeclareLocal(baseProperty.PropertyType); // T value
                generator.Emit(OpCodes.Ldarg_0); // call base.SomeProperty
                generator.Emit(OpCodes.Call, baseGetter); // call to base property getter
                generator.Emit(OpCodes.Stloc_0); // value = result
                generator.Emit(OpCodes.Ldarg_0); // load this
                generator.Emit(OpCodes.Ldfld, interceptorField); // load this._interceptor
                generator.Emit(OpCodes.Ldarg_0); // load this
                generator.Emit(OpCodes.Ldloc_0); // load value
                generator.Emit(OpCodes.Callvirt, interceptorInvoke); // call to interceptor delegate with (this, value)
                generator.Emit(OpCodes.Brtrue_S, lableTrue); // if true, just return
                generator.Emit(OpCodes.Ldarg_0); // else, call the base propertty getter again
                generator.Emit(OpCodes.Call, baseGetter); // call to base property getter
                generator.Emit(OpCodes.Ret);
                generator.MarkLabel(lableTrue);
                generator.Emit(OpCodes.Ldloc_0);
                generator.Emit(OpCodes.Ret);

                propertyBuilder.SetGetMethod(getterBuilder);

                baseImplementor.AddBasePropertyGetter(baseProperty);
                return true;
            }
            return false;
        }

 internal static bool CanProxyGetter(PropertyInfo clrProperty)
 {
     DebugCheck.NotNull(clrProperty);
     return CanProxyMethod(clrProperty.Getter());
 }

            private static void EmitBaseGetter(TypeBuilder typeBuilder, PropertyBuilder propertyBuilder, PropertyInfo baseProperty)
            {
                if (CanProxyGetter(baseProperty))
                {
                    var baseGetter = baseProperty.Getter();
                    const MethodAttributes getterAttributes =
                        MethodAttributes.HideBySig | MethodAttributes.SpecialName | MethodAttributes.Virtual;
                    var getterAccess = baseGetter.Attributes & MethodAttributes.MemberAccessMask;

                    // Define a property getter override in the proxy type
                    var getterBuilder = typeBuilder.DefineMethod(
                        "get_" + baseProperty.Name, getterAccess | getterAttributes, baseProperty.PropertyType, Type.EmptyTypes);
                    var gen = getterBuilder.GetILGenerator();

                    gen.Emit(OpCodes.Ldarg_0);
                    gen.Emit(OpCodes.Call, baseGetter);
                    gen.Emit(OpCodes.Ret);

                    propertyBuilder.SetGetMethod(getterBuilder);
                }
            }

        private void EmitScalarSetter(TypeBuilder typeBuilder, PropertyBuilder propertyBuilder, PropertyInfo baseProperty, bool isKeyMember)
        {
            var baseSetter = baseProperty.Setter();
            const MethodAttributes methodAttributes = MethodAttributes.HideBySig | MethodAttributes.SpecialName | MethodAttributes.Virtual;
            var methodAccess = baseSetter.Attributes & MethodAttributes.MemberAccessMask;

            var setterBuilder = typeBuilder.DefineMethod(
                "set_" + baseProperty.Name, methodAccess | methodAttributes, null, new[] { baseProperty.PropertyType });
            var generator = setterBuilder.GetILGenerator();
            var endOfMethod = generator.DefineLabel();

            // If the CLR property represents a key member of the Entity Type,
            // ignore attempts to set the key value to the same value.
            if (isKeyMember)
            {
                var baseGetter = baseProperty.Getter();

                if (baseGetter != null)
                {
                    // if (base.[Property] != value)
                    // { 
                    //     // perform set operation
                    // }

                    var propertyType = baseProperty.PropertyType;

                    if (propertyType == typeof(int)
                        || propertyType == typeof(short)
                        || propertyType == typeof(Int64)
                        || propertyType == typeof(bool)
                        || propertyType == typeof(byte)
                        || propertyType == typeof(UInt32)
                        || propertyType == typeof(UInt64)
                        || propertyType == typeof(float)
                        || propertyType == typeof(double)
                        || propertyType.IsEnum())
                    {
                        generator.Emit(OpCodes.Ldarg_0);
                        generator.Emit(OpCodes.Call, baseGetter);
                        generator.Emit(OpCodes.Ldarg_1);
                        generator.Emit(OpCodes.Beq_S, endOfMethod);
                    }
                    else if (propertyType == typeof(byte[]))
                    {
                        // Byte arrays must be compared by value
                        generator.Emit(OpCodes.Ldsfld, _compareByteArraysField);
                        generator.Emit(OpCodes.Ldarg_0);
                        generator.Emit(OpCodes.Call, baseGetter);
                        generator.Emit(OpCodes.Ldarg_1);
                        generator.Emit(OpCodes.Callvirt, FuncInvokeMethod);
                        generator.Emit(OpCodes.Brtrue_S, endOfMethod);
                    }
                    else
                    {
                        // Get the specific type's inequality method if it exists
                        var op_inequality = propertyType.GetDeclaredMethod("op_Inequality", propertyType, propertyType);
                        if (op_inequality != null)
                        {
                            generator.Emit(OpCodes.Ldarg_0);
                            generator.Emit(OpCodes.Call, baseGetter);
                            generator.Emit(OpCodes.Ldarg_1);
                            generator.Emit(OpCodes.Call, op_inequality);
                            generator.Emit(OpCodes.Brfalse_S, endOfMethod);
                        }
                        else
                        {
                            // Use object inequality
                            generator.Emit(OpCodes.Ldarg_0);
                            generator.Emit(OpCodes.Call, baseGetter);
                            if (propertyType.IsValueType())
                            {
                                generator.Emit(OpCodes.Box, propertyType);
                            }
                            generator.Emit(OpCodes.Ldarg_1);
                            if (propertyType.IsValueType())
                            {
                                generator.Emit(OpCodes.Box, propertyType);
                            }
                            generator.Emit(OpCodes.Call, ObjectEqualsMethod);
                            generator.Emit(OpCodes.Brtrue_S, endOfMethod);
                        }
                    }
                }
            }

            // Creates code like this:
            //
            // try
            // {
            //     MemberChanging(propertyName);
            //     base.Property_set(value);
            //     MemberChanged(propertyName);
            // }
            // finally
            // {
            //     _resetFKSetterFlagField(this);
            // }
            //
            // Note that the try/finally ensures that even if an exception causes
            // the setting of the property to be aborted, we still clear the flag that
//.........这里部分代码省略.........