Lambda and Expression.Call for an extension method?

I am not sure, but you can only get an extension method from the static class using reflection. Extension methods are not truly added to the class, therefore can't be retrieved with GetMethod.

Thanks, I suppose I need to call GetMethod this way: typeof(StringEx). GetMethod("Like", new {typeof(string)}); but how I have to inject my parameters in Expression. Call?

– CodeAddicted Dec 1 at 7:27 See @Lonli-Lokli's answer below. – Minustar Dec 1 at 11:43.

Use var like = typeof(StringEx). GetMethod("Like", new {typeof(string),typeof(string)}); ie. Retrieve it from the extending type, not from the extended type.

Thanks a lot, but this throws an argument exception: Need null instance for static method, so I need some magic with BindingFlags. Static, but this is outside from my comprehension( – CodeAddicted Dec 1 at 7:33.

If you want to get your extension method worked you must do like this: string str = "some string"; str. Like("second string").

Try this public class Person { public string Name { get; set; } } public static class StringEx { public static bool Like(this string a, string b) { return a.ToLower(). Contains(b.ToLower()); } } Person p = new Person(){Name = "Me"}; var prop = Expression. Property(Expression.

Constant(p), "Name"); var value = Expression. Constant("me"); var like = typeof(StringEx). GetMethod("Like", BindingFlags.

Static | BindingFlags. Public | BindingFlags. NonPublic); var comparer = Expression.

Call(null, like, prop, value ); var vvv = (Func) Expression. Lambda(comparer).Compile(); bool isEquals = vvv.Invoke().

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