How Can I Efficiently Find C# Properties Decorated with a Specific Attribute (AllowMultiple = false)?

Optimizing Attribute Search in C# Properties

In the world of .NET reflection, retrieving a list of properties adorned with a specific attribute can be a frequent necessity. The question at hand deals with identifying properties bearing the MyAttribute attribute, where AllowMultiple is set to false.

The initial approach presented iterated through all properties using t.GetProperties(), followed by a loop to examine each property's attributes with prop.GetCustomAttributes(typeof(MyAttribute), true). While this method works, it involves creating multiple attribute instances, which can be inefficient.

Here's an improved solution that leverages the Where extension method from LINQ:

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

This approach simplifies the attribute checking process by directly invoking Attribute.IsDefined for each property, which efficiently verifies the existence of the desired attribute without instantiating it. This significantly improves performance, especially for types with a large number of properties.

Moreover, the resulting props variable is an IEnumerable of PropertyInfo objects, allowing for further filtering or manipulation as needed.

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