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    <p>When you run this simple program it explains how overloading works :). The answer is that the underlying type's method will be called. And it should work the same way for <code>IQueryable</code> and <code>IEnumerable</code>; that is, the original object's method will be called since even though we cast it something else the actual implementation is of the original type. But when there is an extension method the extension method for the object which is referenced is used, so in that case it depends on the logic in the extension method. The extension method could have come clever logit to see if the object is of an actual type and then cast it back before it executes the method.</p> <pre><code>class Program { static void Main(string[] args) { MyString2 myString2 = new MyString2(); var myString = (MyString)myString2; Console.WriteLine(myString); // prints "ToString of MyString2" Console.WriteLine(myString.GiveMeTheString()); // prints "GiveMeTheString of MyString2" Console.ReadLine(); } } public class MyString { public string MyProperty { get; set; } public override string ToString() { return "ToString of MyString"; } } public class MyString2 : MyString { public string MyProperty { get; set; } public override string ToString() { return "ToString of MyString2"; } } public static class Extensions { public static string GiveMeTheString(this MyString myString) { return "GiveMeTheString of MyString"; } public static string GiveMeTheString(this MyString2 myString) { return "GiveMeTheString of MyString2"; } } </code></pre>
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    1. POIf I cast an IQueryable as an IEnumerable then call a Linq extension method, which implementation gets called?
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    1. USTomas Jansson
    1. USTomas Jansson
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    1. COThank you Tomas! I knew I should be able to work this out by coding but my brain wasn't working! At least now though someone else searching for the solution hopefully will come across this post.
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      1. USJames Morcom
    2. COI should add - the answer is that the more specific (IQueryable) extension method will be called.
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      1. USJames Morcom
    3. COHappens to the best of us. Remember to vote and accept answer so other people can find the answer more easily; that is, if it is correct. And I'll add that part somewhere in my answer.
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      1. USTomas Jansson
 

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