Using LINQ and reflection to find matching properties of objects

As a side product of some experiments I wrote simple LINQ query that matches properties of two objects and returns these properties as list. The code I wrote is pretty simple and I packed it for you as method. Later I used this code to write my experimental and heavily tuned object-to-object mapper.

Here is the GetMatchingProperties() method that makes the work.

public IList<PropertyInfo> GetMatchingProperties(object source, object target)
if (source == null
throw new ArgumentNullException("source"
if (target == null
throw new ArgumentNullException("target"

sourceType = source.GetType();
sourceProperties = sourceType.GetProperties();
targetType = target.GetType();
targetProperties = targetType.GetProperties();

var properties = (from s in
from t in
s.Name == t.Name &&
                            s.PropertyType == t.PropertyType
return properties;

The method returns only those properties that match by name and type. If both objects have property called Sum and both of them have Sum in different type (let’s say float and decimal) then this property is not returned by this method. Of course, you can extend this method if you like and you can make it much more clever. Simple implementation given here worked for me very well.

Gunnar Peipman

Gunnar Peipman is ASP.NET, Azure and SharePoint fan, Estonian Microsoft user group leader, blogger, conference speaker, teacher, and tech maniac. Since 2008 he is Microsoft MVP specialized on ASP.NET.

    7 thoughts on “Using LINQ and reflection to find matching properties of objects

    • December 26, 2009 at 6:51 pm

      Cool, but you could also use .Intersects() which is the intended method I think. But yours is properly prettier because the extra “where” syntactic sugar. Best regards, Lasse

    • December 26, 2009 at 10:52 pm

      Thanks for feedback, Lasse! I think this where part is pretty important because this somebody may want to add “smarter stuff” there. :)

    • December 27, 2009 at 4:28 pm

      Did anyone actually try this. I just inserted the VB.NET code into a form and it does not compile.

      Error 1 Operator ‘=’ is not defined for types ‘System.Type’ and ‘System.Type’. C:\Visual Studio Projects\TestLinqObjectCompare\TestLinqObjectCompare\Form1.vb 30 35 TestLinqObjectCompare

    • January 14, 2010 at 10:05 pm

      @Lloyd Sheen: In case of VB.NET, use “Is” instead of “=” on Reference Types.

    • February 19, 2010 at 1:56 pm

      Great idea, but will this work over the long run?

    • August 2, 2011 at 4:44 am

      Wirklich ein wahrer Kommentar. Ich muss echt haufiger lesen

    • Pingback:Performance: Using dynamic code to copy property values of two objects | Gunnar Peipman - Programming Blog

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