strong-typing

问题 I'm working on my first 'real' Haskell project, and simultaneously trying to get my head around event sourcing. (It seemed like a good match; event sourcing is a rather functional way of looking at data.) I've hit a wall trying to figure out how to deserialise my events into strongly typed Haskell data. There are two opposing forces at work here: It shouldn't be possible to apply an event to the wrong type of aggregate. This requirement suggests that I need a separate type of event for each

问题 I would like to access csv files in scala in a strongly typed manner. For example, as I read each line of the csv, it is automatically parsed and represented as a tuple with the appropriate types. I could specify the types beforehand in some sort of schema that is passed to the parser. Are there any libraries that exist for doing this? If not, how could I go about implementing this functionality on my own? 回答1: product-collections appears to be a good fit for your requirements: scala> val

问题 I would like to access csv files in scala in a strongly typed manner. For example, as I read each line of the csv, it is automatically parsed and represented as a tuple with the appropriate types. I could specify the types beforehand in some sort of schema that is passed to the parser. Are there any libraries that exist for doing this? If not, how could I go about implementing this functionality on my own? 回答1: product-collections appears to be a good fit for your requirements: scala> val

问题 The high level problem I'm having in C# is to make a single copy of a data structure that describes a robot control network packet (Ethercat), and then to use that single data structure to extract data from a collection of packets. The problem arises when attempting to use the data from the accumulated packets as there is implicit duplication of the data structure with casting or calling functions that specify the type. To assist in explaining the goal, I've written a python program that does

问题 The high level problem I'm having in C# is to make a single copy of a data structure that describes a robot control network packet (Ethercat), and then to use that single data structure to extract data from a collection of packets. The problem arises when attempting to use the data from the accumulated packets as there is implicit duplication of the data structure with casting or calling functions that specify the type. To assist in explaining the goal, I've written a python program that does

问题 In order to protect ourself from failure because of any renaming of properties (Let's say you regenerate your poco classes because you have changed some column names in the relevant Db table) is it a good practice to decalre constant strings that keep the property names inside? public const string StudentCountPropertyName = "StudentCount"; public int StudentCount {get;set;} For example: Think about a DataBinding; where you type the property name in the DataFieldName attribute explicitly. Or

问题 I add that to my header <%@ Page Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage" %> and am able to access ViewData and all its internals as well as all the mvc objects like url and html. As soon as I add " System.Web.Mvc.ViewPage<app.Models.tTable> " I have no access to any mvc classes and helper methods. I am confused on why this is. I have done an upgrade from mvc preview 5 to rc1 recently but my transition to rc1 was flawless without any errors

问题 I need to encode and Decode AS3 Objects in a typed manner. http://code.google.com/p/as3corelib/ only supports untyped encoding and decoding. http://code.google.com/p/ason/ supports some kind of typed objects but is not very robust, e.g. it fails on Date Objects. Any Recommendations ? To make it clear: It MUST be JSON and it MUST be strong typed and robust. 回答1: JSON is built in in AS3. The preferred method to transmit data over the wire is AMF, which does provide you typed objects. If you

问题 I am developing an ASP.NET MVC project and want to use strongly-typed session objects. I have implemented the following Controller-derived class to expose this object: public class StrongController<_T> : Controller where _T : new() { public _T SessionObject { get { if (Session[typeof(_T).FullName] == null) { _T newsession = new _T(); Session[typeof(_T).FullName] = newsession; return newsession; } else return (_T)Session[typeof(_T).FullName]; } } } This allows me to define a session object for

问题 I am developing an ASP.NET MVC project and want to use strongly-typed session objects. I have implemented the following Controller-derived class to expose this object: public class StrongController<_T> : Controller where _T : new() { public _T SessionObject { get { if (Session[typeof(_T).FullName] == null) { _T newsession = new _T(); Session[typeof(_T).FullName] = newsession; return newsession; } else return (_T)Session[typeof(_T).FullName]; } } } This allows me to define a session object for