Invoke a lambda function through reflection

Introduction

At work I was writing a small library for a customer - in this library you are able to setup strongly-typed seaching objects that uses lambda expressions to search through a domain model.

All-in-all a nice little library that worked fast and was easy to use. But I came across a problem when I needed to combine two or more search-objects. It is a small article that shows you how you can invoke a generic lambda function through reflection.

Background

If you have the following class defined in your domainmodel:

1. 
   public class LambdaClass<t>  
2. {  
3.     public Func<t, bool=""> TestMethod { get; set; }  
4.   
5.     public LambdaClass(Func<t, bool=""> testMethod)  
6.     {  
7.         TestMethod = testMethod;  
8.     }  
9. }

 

You can use this class like this:

1. 
   

LambdaClass<string> lambdaTest = new LambdaClass<string>(entry => entry.Contains("Tom"));  

if (lambdaTest.TestMethod("My name is Tom"))   

{  

   Console.WriteLine("Yes it is");   

}  

 
This is all fine - but what if I need to call the TestMethod on the LambdaClass but I don't know the generic type?!

Using the code

It is possible and to do this, but we have to introduce a new interface for all of this to work properly - we need to make a little abstraction and have the possibility to get the generic type.

Read more: Codeproject

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