This post originated from an RSS feed registered with .NET Buzz by Jeff Key. Original Post: Getting the true type of a parameter passed by ref or out via reflection Feed Title: Jeff Key Feed URL: http://www.asp.net/err404.htm?aspxerrorpath=/jkey/Rss.aspx Feed Description: Topics revolve around .NET and the Windows platform. Latest .NET Buzz Posts Latest .NET Buzz Posts by Jeff Key Latest Posts From Jeff Key

Getting the type of a parameter passed by value via reflection is simple; however, if the parameter is a ref or out, the story's a bit different. For example, a ref or out DateTime parameter's type is actually DateTime&, which is not the same as DateTime and type equality comparisons will fail. Luckily for us, the solution is easy.

Instead of calling ParameterInfo.ParameterType, you need to call ParameterInfo.GetElementType(). Type also has a HasElementType property that indicates wheether you need to call GetElementType().