How Can Reflection Be Used to Detect Added Extension Methods in C#?

Determining Extension Method Addition Using Reflection

In C#, extension methods can augment existing classes without modifying their source code. To ascertain whether an extension method has been added to a class, reflection provides a viable technique.

Using reflection, you can inspect assemblies for classes adorned with the ExtensionAttribute. Within these classes, search for methods also decorated with the ExtensionAttribute. Subsequently, compare the type of the method's first parameter to the target type.

For example, consider the StringExtensions class with the Reverse method as an extension for the string class:

public static class StringExtensions
{
    public static string Reverse(this string value)
    {
        // Implementation omitted
    }
}

Using the provided code snippet, you can detect this extension method:

var assembly = typeof(StringExtensions).Assembly;
var extensionMethods = GetExtensionMethods(assembly, typeof(string));
Console.WriteLine(extensionMethods.First()); // Output: "StringExtensions.Reverse(string)"

This approach ensures that you check all relevant assemblies and provides a mechanism to verify that the extension method has been correctly added to your codebase.

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