From 2225c28e001cb71bad55467c246332ebcefc87fc Mon Sep 17 00:00:00 2001
From: Simon G <simon.gockner@gmail.com>
Date: Fri, 18 Sep 2020 22:37:17 +0200
Subject: [PATCH] - add GenericMethodCaller

---
 .../GenericMethodNotFoundException.cs         | 17 ++++++++++
 .../GenericMethodCaller.cs                    | 31 +++++++++++++++++++
 2 files changed, 48 insertions(+)
 create mode 100644 LightweightIocContainer/Exceptions/GenericMethodNotFoundException.cs
 create mode 100644 LightweightIocContainer/GenericMethodCaller.cs

diff --git a/LightweightIocContainer/Exceptions/GenericMethodNotFoundException.cs b/LightweightIocContainer/Exceptions/GenericMethodNotFoundException.cs
new file mode 100644
index 0000000..136eb24
--- /dev/null
+++ b/LightweightIocContainer/Exceptions/GenericMethodNotFoundException.cs
@@ -0,0 +1,17 @@
+// Author: Simon Gockner
+// Created: 2020-09-18
+// Copyright(c) 2020 SimonG. All Rights Reserved.
+
+using System;
+
+namespace LightweightIocContainer.Exceptions
+{
+    public class GenericMethodNotFoundException : Exception
+    {
+        public GenericMethodNotFoundException(string functionName)
+            : base($"Could not find function {functionName}")
+        {
+            
+        }
+    }
+}
\ No newline at end of file
diff --git a/LightweightIocContainer/GenericMethodCaller.cs b/LightweightIocContainer/GenericMethodCaller.cs
new file mode 100644
index 0000000..799b4b7
--- /dev/null
+++ b/LightweightIocContainer/GenericMethodCaller.cs
@@ -0,0 +1,31 @@
+// Author: Simon Gockner
+// Created: 2020-09-18
+// Copyright(c) 2020 SimonG. All Rights Reserved.
+
+using System;
+using System.Reflection;
+using LightweightIocContainer.Exceptions;
+
+namespace LightweightIocContainer
+{
+    public static class GenericMethodCaller
+    {
+        public static object Call(object caller, string functionName, Type genericParameter, BindingFlags bindingFlags, params object[] parameters)
+        {
+            MethodInfo method = caller.GetType().GetMethod(functionName, bindingFlags);
+            MethodInfo genericMethod = method?.MakeGenericMethod(genericParameter);
+
+            if (genericMethod == null)
+                throw new GenericMethodNotFoundException(functionName);
+
+            try //exceptions thrown by methods called with invoke are wrapped into another exception, the exception thrown by the invoked method can be returned by `Exception.GetBaseException()`
+            {
+                return genericMethod.Invoke(caller, parameters);
+            }
+            catch (Exception ex)
+            {
+                throw ex.GetBaseException();
+            }
+        }
+    }
+}
\ No newline at end of file