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    <p>Using reflection in and of itself is not bad, but you will take a performance hit especially if you do it recursively.</p> <p>I am not a fan of the hard coded copy constructors either because developers forget to update them when they add new properties to a class.</p> <p>There are other ways of accomplishing what you want, including Marc Gravells <a href="http://www.codeproject.com/KB/cs/HyperPropertyDescriptor.aspx" rel="nofollow noreferrer">Hyper Property Descriptor</a> or if you want to learn some IL and OPCodes you can use System.Reflection.Emit or even <a href="http://www.mono-project.com/Cecil" rel="nofollow noreferrer">Cecil from Mono</a>.</p> <p>Here's an example of using Hyper Property Descriptor that you can possibly tailor to your needs:</p> <pre><code>using System; using System.Collections.Generic; using System.ComponentModel; using Hyper.ComponentModel; namespace Test { class Person { public int Id { get; set; } public string Name { get; set; } } class Program { static void Main() { HyperTypeDescriptionProvider.Add(typeof(Person)); var properties = new Dictionary&lt;string, object&gt; { { "Id", 10 }, { "Name", "Fred Flintstone" } }; Person person = new Person(); DynamicUpdate(person, properties); Console.WriteLine("Id: {0}; Name: {1}", person.Id, person.Name); Console.ReadKey(); } public static void DynamicUpdate&lt;T&gt;(T entity, Dictionary&lt;string, object&gt; { foreach (PropertyDescriptor propertyDescriptor in TypeDescriptor.GetProperties(typeof(T))) if (properties.ContainsKey(propertyDescriptor.Name)) propertyDescriptor.SetValue(entity, properties[propertyDescriptor.Name]); } } } </code></pre> <p>If you decide to carry on using reflection, you can reduce the performance hit by caching your calls to GetProperties() like so:</p> <pre><code>public Foo(IFoo other) { foreach (var property in MyCacheProvider.GetProperties&lt;IFoo&gt;()) property.SetValue(this, property.GetValue(other, null), null); } </code></pre>
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    1. POHow to use reflection to simplify constructors & comparisons?
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    1. COType.GetProperties already does its own caching (time the first call and subsequent calls). The real performance hit of reflection is the property.SetValue call, which you can mitigate with MSIL generation etc
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      1. USRob Fonseca-Ensor
    2. CO@Rob Fonseca-Ensor Thanks, I didn't know that.
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      1. USgrenade
    3. COHmm... if the performance hit is in setting the values then this probably isn't the way to go. Trying to deal with all that low-level stuff would certainly be overkill. Thanks for the input.
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