C# – Using reflection to get properties

You can get a list of a type’s properties using reflection, like this: Note: If you have an object, use movie.GetType().GetProperties() instead. This outputs the following: When you use GetProperties(), it returns a list of PropertyInfo objects. This gives you access the property’s definition (name, type, etc…) and allows you to get and modify its … Read more

C# – How to load assemblies at runtime using Microsoft Extensibility Framework (MEF)

You can use Microsoft Extensibility Framework (MEF) to load assemblies at runtime. This is an alternative to implementing dynamic assembly loading with a more manual approach (like using AssemblyLoadContext). Here’s an example of using MEF to load an instance of IMessageProcessorPlugin from some assembly located in the C:\Plugins directory: MEF looks for exported types in … Read more

C# – Get all loaded assemblies

You can get all of the loaded assemblies with AppDomain.CurrentDomain.GetAssemblies(). Here’s an example of looping over all loaded assemblies and outputting their metadata: This outputs the following information: I’ll show more examples of how you can use the assembly information. Get custom assembly attributes Assembly attributes are defined like this: There are a few attributes … Read more

TargetParameterCountException: Parameter count mismatch

When you are using reflection to call a method, you may run into this exception: System.Reflection.TargetParameterCountException: Parameter count mismatch. This exception is straightforward – you aren’t passing in the correct number of parameters to MethodInfo.Invoke(). This article shows three different cases where you might run into this exception when using reflection. Using reflection to invoke … Read more

C# – How to implement the plugin pattern

In this article, I’ll explain how to implement the plugin pattern. This approach uses a generic plugin loader that solves many real world problems when loading plugins in .NET. Besides being generic, this plugin loader also solves the following real world problems when working with plugins: If you find that this generic plugin loader doesn’t … Read more