How Can I Efficiently Retrieve Properties with a Specific Attribute in C#?

How to Efficiently Retrieve Properties with Specific Attributes

Consider the task of obtaining a list of public properties within a specified type that possess a particular attribute, termed MyAttribute. This attribute is defined with AllowMultiple set to false, indicating that each property can possess at most one instance of the attribute.

A common approach involves iterating over the properties using GetProperties() and checking each property for the presence of MyAttribute via GetCustomAttribute[s]. However, this technique can be suboptimal.

Introducing a More Efficient Solution

To optimize this retrieval process, consider the following code snippet:

var props = t.GetProperties().Where(
                prop => Attribute.IsDefined(prop, typeof(MyAttribute)));

This improved approach utilizes the Where extension method to filter the list of properties, only selecting those that have the MyAttribute attribute defined. This technique is more efficient as it avoids instantiating attribute instances for properties that do not possess the desired attribute.

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