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POPassing a dynamic parameter throws RuntimeBinderException when calling Method from Inherited interface
 

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  1. POPassing a dynamic parameter throws RuntimeBinderException when calling Method from Inherited interface
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    <p>Ran into an interesting runtime issue after some refactoring and have pinned in down to the following situation. </p> <p>When passing a property from a dynamic object to a method on an Interface that has been inherited from a parent interface the runtime binder cannot find the method. </p> <p>Here is a test to demonstrate both failure and success (when calling method directly on the parent interface type)</p> <pre><code>using System.Dynamic; using Microsoft.CSharp.RuntimeBinder; using Microsoft.VisualStudio.TestTools.UnitTesting; namespace Test.Utility { public interface IEcho { string EchoString(string input); } public interface IInheritEcho : IEcho { } public class EchoClass : IInheritEcho { public string EchoString(string input) { return input; } } [TestClass] public class RuntimeBinderTest { [TestMethod] public void RuntimeBinder_should_work_when_dynamic_parameters_are_passed_to_method_from_inherited_interface() { //Arrange dynamic dynObject = new ExpandoObject(); dynObject.Foo = "Bar"; IInheritEcho echomore = new EchoClass(); string echo = null; string exceptionMessage = null; //Act try { echo = echomore.EchoString(dynObject.Foo); } catch (RuntimeBinderException e) { exceptionMessage = e.Message; } //Assert Assert.AreEqual(echo, dynObject.Foo, false, exceptionMessage); } [TestMethod] public void RuntimeBinder_should_work_when_dynamic_parameters_are_passed_to_method_from_noninherited_interface() { //Arrange dynamic dynObject = new ExpandoObject(); dynObject.Foo = "Bar"; IEcho echomore = new EchoClass(); string echo = null; string exceptionMessage = null; //Act try { echo = echomore.EchoString(dynObject.Foo); } catch (RuntimeBinderException e) { exceptionMessage = e.Message; } //Assert Assert.AreEqual(echo, dynObject.Foo, false, exceptionMessage); } } } </code></pre> <p>Test #1 Fails: Assert.AreEqual failed. Expected:&lt;(null)>. Actual:. 'Test.Utility.IInheritEcho' does not contain a definition for 'EchoString'</p> <p>Test #2 Succeeds.</p> <p>My question is whether my assumption that the 1st test should pass is correct or is there a fundamental reason in the framework that it does not?</p> <p>I know I can fix the issue by casting the parameters when I pass them in or assigning them to variables before passing them in. I'm more just curious as to the reason the inherited interface is causing the RuntimeBinder to fail...</p>
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    1. COYou're completely right. (Although it's of an older c# version: http://msdn.microsoft.com/en-us/library/aa664578%28VS.71%29.aspx) There must be a failure. What if you use a regular class with a string property instead of the expando object? Does it find the method in the inherited interface? (Don't have VS here to make the test myself). If it was with static binding (compile time binding), then there's something wrong with the dynamic binder (run time binder).
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    2. COUsing a regular class with a string property passes as expected. It's definitely the runtime binder that is not behaving...
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    3. COIf you look at igofed's answer link to Microsof Connect, this bug is knwon and most probably won't be solved in the new VS version.
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