Faster way to cast a Func to Func? [duplicate]

Answer 1

As you know, you can obtain a MethodInfo from PropertyInfo.GetGetMethod(). From that, you can use the following to get a Func to retrieve that property. By a similar method, you could return a strongly-typed Func. For any given MethodInfo, you should cache the results of this call if you need it more than once since this method is at least an order of magnitude more expensive than calling the resulting delegate.

private static Func BuildAccessor(MethodInfo method)
{
    ParameterExpression obj = Expression.Parameter(typeof(object), "obj");

    Expression> expr =
        Expression.Lambda>(
            Expression.Convert(
                Expression.Call(
                    Expression.Convert(obj, method.DeclaringType),
                    method),
                typeof(object)),
            obj);

    return expr.Compile();
}