InvokeUtility.cs

// GitHub URL: https://github.com/fernweh8000/TestUtilities

/* The MIT License (MIT)

Copyright (c) 2015 http://fernweh.jp

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
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copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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using Fernweh8000.TestUtilities.Private;
using System;
using System.Collections.Generic;
using System.Reflection;

namespace Fernweh8000.TestUtilities
{
    /// <summary>
    /// Utility to access private method
    /// </summary>
    /// <typeparam name="TTarget">target type to invoke method. TTarget must be itself or sub class of TDeclaring</typeparam>
    /// <typeparam name="TDeclaring">declearing type of method</typeparam>
    public class InvokeUtility<TTarget, TDeclaring> where TTarget : TDeclaring
    {
        /// <summary>
        /// invoke instance method with return value
        /// </summary>
        /// <param name="name">method name</param>
        /// <param name="args">method arguments</param>
        public static object Invoke(
            string name,
            params object[] args)
        {
            return Invoke(
                constructorArguments: Helper.NoArguments,
                constructorParameterTypes: null,
                name: name,
                args: args,
                parameterTypes: null);
        }

        /// <summary>
        /// invoke instance method with return value
        /// </summary>
        /// <param name="name">method name</param>
        /// <param name="args">method arguments</param>
        /// <param name="parameterTypes">method parameter types. infer types if null</param>
        public static object Invoke(
          string name,
          IEnumerable<object> args,
          IEnumerable<Type> parameterTypes)
        {
            return Invoke(
                constructorArguments: Helper.NoArguments,
                constructorParameterTypes: null,
                name: name,
                args: args,
                parameterTypes: parameterTypes);
        }

        /// <summary>
        /// invoke instance method with return value
        /// </summary>
        /// <param name="constructorArguments">constructor arguments</param>
        /// <param name="name">method name</param>
        /// <param name="args">method arguments</param>
        public static object Invoke(
            IEnumerable<object> constructorArguments,
            string name,
            params object[] args)
        {
            return Invoke(
                constructorArguments,
                null,
                name,
                args,
                null);
        }

        /// <summary>
        /// invoke instance method with return value
        /// </summary>
        /// <param name="constructorArguments">constructor arguments</param>
        /// <param name="constructorParameterTypes">constructor parameter types. infer types if null</param>
        /// <param name="name">method name</param>
        /// <param name="args">method arguments</param>
        public static object Invoke(
            IEnumerable<object> constructorArguments,
            IEnumerable<Type> constructorParameterTypes,
            string name,
            params object[] args)
        {
            return Invoke(
                constructorArguments,
                constructorParameterTypes,
                name,
                args,
                null);
        }

        /// <summary>
        /// invoke instance method with return value
        /// </summary>
        /// <param name="constructorArguments">constructor arguments</param>
        /// <param name="name">method name</param>
        /// <param name="args">method arguments</param>
        /// <param name="parameterTypes">method parameter types. infer types if null</param>
        public static object Invoke(
            IEnumerable<object> constructorArguments,
            string name,
            IEnumerable<object> args,
            IEnumerable<Type> parameterTypes)
        {
            return Invoke(
                constructorArguments,
                null,
                name,
                args,
                parameterTypes);
        }

        /// <summary>
        /// invoke instance method with return value
        /// </summary>
        /// <param name="constructorArguments">constructor arguments</param>
        /// <param name="constructorParameterTypes">constructor parameter types. infer types if null</param>
        /// <param name="name">method name</param>
        /// <param name="args">method arguments</param>
        /// <param name="parameterTypes">method parameter types. infer types if null</param>
        public static object Invoke(
            IEnumerable<object> constructorArguments,
            IEnumerable<Type> constructorParameterTypes,
            string name,
            IEnumerable<object> args,
            IEnumerable<Type> parameterTypes)
        {
            if (constructorArguments == null)
            {
                throw new ArgumentNullException("constructorArguments");
            }

            MethodInfo m = Helper.GetMethod(
                typeof(TDeclaring),
                name,
                Helper.InstanceMethodBindingAttr,
                args,
                parameterTypes);

            if (m == null)
            {
                throw new MissingMethodException(
                  typeof(TDeclaring).ToString(), name);
            }

            var obj = InvokeUtility<TTarget>.New(
                constructorArguments,
                constructorParameterTypes);

            try
            {
                return m.Invoke(
                    obj, args == null ? null : Helper.ArgumentsToArray(args));
            }
            catch (TargetInvocationException ex)
            {
                throw ex.InnerException;
            }
        }
    }

    /// <summary>
    /// Utility to access private method
    /// </summary>
    /// <typeparam name="TTarget">target type to invoke method</typeparam>
    public class InvokeUtility<TTarget>
        : InvokeUtility<TTarget, TTarget>
    {
        /// <summary>
        /// invoke constructor to get instance
        /// </summary>
        /// <param name="args">method arguments</param>
        /// <returns>TTarget type new instance</returns>
        public static TTarget New(params object[] args)
        {
            return InvokeUtility<TTarget>.New(args, null);
        }

        /// <summary>
        /// invoke constructor to get instance
        /// </summary>
        /// <param name="args">method arguments</param>
        /// <param name="parameterTypes">constructor parameter types. infer types if null</param>
        /// <returns>TTarget type new instance</returns>
        public static TTarget New(IEnumerable<object> args, IEnumerable<Type> parameterTypes)
        {
            if (args == null)
            {
                throw new ArgumentNullException("args");
            }

            ConstructorInfo ctor = Helper.GetConstructor(
                typeof(TTarget), args, parameterTypes);

            if (ctor == null)
            {
                throw new MissingMethodException(
                    typeof(TTarget).Name, ".ctor");
            }

            try
            {

                return (TTarget)ctor.Invoke(
                    args == null ? null : Helper.ArgumentsToArray(args));
            }
            catch (TargetInvocationException ex)
            {
                throw ex.InnerException;
            }
        }

        /// <summary>
        /// invoke static method with return value
        /// </summary>
        /// <param name="name">method name</param>
        /// <param name="args">method arguments</param>
        public static object InvokeStatic(
            string name,
            params object[] args)
        {
            return InvokeStatic(name, args, null);
        }

        /// <summary>
        /// invoke static method with return value
        /// </summary>
        /// <param name="name">method name</param>
        /// <param name="args">method arguments</param>
        /// <param name="parameterTypes">method parameter types. infer types if null</param>
        public static object InvokeStatic(
            string name,
            IEnumerable<object> args,
            IEnumerable<Type> parameterTypes)
        {
            MethodInfo m = Helper.GetMethod(
                typeof(TTarget),
                name,
                Helper.StaticMethodBindingAttr,
                args,
                parameterTypes);

            if (m == null)
            {
                throw new MissingMethodException(
                    typeof(TTarget).Name, name);
            }

            try
            {
                return m.Invoke(
                    null, Helper.ArgumentsToArray(args));
            }
            catch (TargetInvocationException ex)
            {
                throw ex.InnerException;
            }
        }
    }
}