How Can I Efficiently Get a List of Properties with a Specific Non-Multiple Attribute?

Getting a Property List with a Specific Attribute

In order to retrieve a list of public properties that possess a certain attribute marked as non-multiple (AllowMultiple attribute set to false), a common approach is to loop through the properties and check for the attribute's presence.

foreach (var property in t.GetProperties())
{
    var attributes = property.GetCustomAttributes(typeof(MyAttribute), true);
    if (attributes.Length == 1)
    {
        // Property with custom attribute
    }
}

However, an optimized way to achieve the same result is to utilize LINQ's where clause along with Attribute.IsDefined() as seen below:

var properties = t.GetProperties().Where(
    property => Attribute.IsDefined(property, typeof(MyAttribute)));

This alternative method bypasses the need to create attribute instances, resulting in a more efficient approach.

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