Class MemberInfoDecoratorExtensions

Namespace: Cuemon.Reflection

Assembly: Cuemon.Core.dll

Extension methods for the MemberInfo class hidden behind the IDecorator<T> interface.

public static class MemberInfoDecoratorExtensions

Inheritance: object

MemberInfoDecoratorExtensions

Examples

MemberInfoDecoratorExtensions provides extension methods on Decorator.Enclose for checking whether a MemberInfo has one or more custom attributes via HasAttribute. This example gets MemberInfo for a method without attributes and another decorated with [Obsolete], then calls HasAttribute with single (ObsoleteAttribute) and multiple attribute types on each. Console output shows False for the method without ObsoleteAttribute, False for Obsolete or EditorBrowsable, and True for the deprecated method, confirming correct attribute detection through the decorator pattern.

using System;
using System.ComponentModel;
using System.Reflection;
using Cuemon;
using Cuemon.Reflection;

namespace MyApp.Reflection
{
    public class MemberInfoDecoratorExtensionsExample
    {
        public void Demonstrate()
        {
            // Get a MemberInfo for a method
            MemberInfo demoMethod = typeof(MemberInfoDecoratorExtensionsExample)
                .GetMethod(nameof(Demonstrate));

            // Check if the method has a specific attribute
            bool hasObsolete = Decorator.Enclose(demoMethod)
                .HasAttribute(typeof(ObsoleteAttribute));
            Console.WriteLine($"Has ObsoleteAttribute: {hasObsolete}"); // False

            // Check for multiple attributes at once
            bool hasAny = Decorator.Enclose(demoMethod)
                .HasAttribute(typeof(ObsoleteAttribute), typeof(EditorBrowsableAttribute));
            Console.WriteLine($"Has Obsolete or EditorBrowsable: {hasAny}"); // False

            // A member with an attribute
            MemberInfo deprecatedMethod = typeof(MemberInfoDecoratorExtensionsExample)
                .GetMethod(nameof(OldMethod));

            bool isDeprecated = Decorator.Enclose(deprecatedMethod)
                .HasAttribute(typeof(ObsoleteAttribute));
            Console.WriteLine($"OldMethod has ObsoleteAttribute: {isDeprecated}"); // True
        }

        [Obsolete("Use Demonstrate instead.")]
        public void OldMethod()
        {
        }
    }
}

Methods

HasAttribute(IDecorator<MemberInfo>, params Type[])

Determines whether the underlying MemberInfo of the decorator implements one or more of the specified attributeTypes.

public static bool HasAttribute(this IDecorator<MemberInfo> decorator, params Type[] attributeTypes)

Parameters

decorator IDecorator<MemberInfo>: The IDecorator<T> to extend.
attributeTypes Type[]: The attribute types to be matched against.

Returns

bool: true if the underlying MemberInfo of the decorator implements one or more of the specified attributeTypes; otherwise, false.

Exceptions

ArgumentNullException: decorator cannot be null -or- attributeTypes cannot be null.

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