Rethrow exception (#36)

* Rethrow exception

* Add test that you get the right kind of exception

Author: wallymathieu

.gitignore

@@ -34,4 +34,4 @@ appsettings.config
 .vs/
 # project rider
 .idea
-
+.ionide

src/Isop/Domain/Method.cs

@@ -3,6 +3,7 @@
 using System.Collections.Generic;
 using System.Linq;
 using System.ComponentModel.DataAnnotations;
+using System.Runtime.ExceptionServices;
 
 namespace Isop.Domain
 {
@@ -23,7 +24,12 @@ public Parameter[] GetParameters(){
         }
         public object Invoke(object instance, object[] values){
             if (instance==null) throw new ArgumentNullException(nameof(instance));
-            return _methodInfo.Invoke(instance, values);
+            try{
+                return _methodInfo.Invoke(instance, values);
+            }catch(TargetInvocationException ex){
+                ExceptionDispatchInfo.Capture(ex.InnerException).Throw();
+                return null;
+            }
         }
 
         public IEnumerable<Argument> GetArguments()

src/Tests/ExceptionsTests.cs

@@ -0,0 +1,29 @@
+using System.Globalization;
+using System.IO;
+using System.Linq;
+using Microsoft.Extensions.DependencyInjection;
+using NUnit.Framework;
+namespace Isop.Tests
+{
+    [TestFixture]
+    public class ExceptionsTests
+    {
+        public class SpecificException : System.Exception
+        {
+        }
+
+        [Test]
+        public void It_can_parse_class_and_method_and_execute()
+        {
+            var sc = new ServiceCollection();
+            sc.AddSingleton(ci => new ObjectController() { OnAction = () => throw new SpecificException() });
+
+            var arguments = new Build(sc) { typeof(ObjectController) }
+                                .SetCulture(CultureInfo.InvariantCulture)
+                                .Parse(new[] { "Object", "Action" });
+
+            Assert.That(arguments.UnRecognizedArguments.Count(), Is.EqualTo(0));
+            Assert.Throws<SpecificException>(() =>arguments.Invoke(new StringWriter()));
+        }
+    }
+}