public FastMethodInfo(MethodInfo methodInfo)
{
var instanceExpression = Expression.Parameter(typeof(object), "instance");
var argumentsExpression = Expression.Parameter(typeof(object[]), "arguments");
var argumentExpressions = new List <Expression>();
var parameterInfos = methodInfo.GetParameters();
for (var i = 0; i < parameterInfos.Length; ++i)
{
var parameterInfo = parameterInfos[i];
argumentExpressions.Add(Expression.Convert(Expression.ArrayIndex(argumentsExpression, Expression.Constant(i)), parameterInfo.ParameterType));
}
var callExpression = Expression.Call(!methodInfo.IsStatic ? Expression.Convert(instanceExpression, methodInfo.ReflectedType) : null, methodInfo, argumentExpressions);
if (callExpression.Type == typeof(void))
{
var voidDelegate = Expression.Lambda <VoidDelegate>(callExpression, instanceExpression, argumentsExpression).Compile();
_delegate = (instance, arguments) =>
{
voidDelegate(instance, arguments);
return(null);
};
}
else
{
_delegate = Expression.Lambda <ReturnValueDelegate>(Expression.Convert(callExpression, typeof(object)), instanceExpression, argumentsExpression).Compile();
}
}
public MethodInvoker(MethodInfo methodInfo, Type[] parameterTypes, Type returnType)
{
ParameterTypes = parameterTypes;
ReturnsResult = returnType != null;
ReturnType = returnType;
_delegate = BuildDelegate(methodInfo);
if (ReturnsResult)
{
TaskReturnPropertyInfo = methodInfo.ReturnType.GetTypeInfo().GetProperty("Result");
}
}
private static void DelegatesAndAnonymousMethods()
{
var demoDelegate = new DemoDelegate();
var simpleDelegate = new SimpleDelegate(demoDelegate.MethodA);
ReturnValueDelegate returnValueDelegate = demoDelegate.MethodB;
TwoParametersDelegate twoParametersDelegate = demoDelegate.MethodC;
Console.WriteLine("Delegates -----------------------------------------------------------------");
simpleDelegate();
returnValueDelegate();
twoParametersDelegate("Michael", 43);
demoDelegate.Repeat3Times(simpleDelegate);
demoDelegate.Repeat3Times2(delegate(string n, int a) { Console.WriteLine("delegate({0}, {1})", n, a); });
Console.WriteLine();
}
