F＃基础：转动的NameValueCollection成漂亮的字符串 [英] F# basics: turning NameValueCollection into nice string

问题描述

学习F＃，同时试图做一些事情，同时是有用的，所以这是一种基本的问题：

我有 REQ ，这是一个 HttpListenerRequest ，其中有查询字符串属性中，键入 System.Collections.Specialized.NameValueCollection 。因此，为了清楚起见，让我们说，我有

让QUERYSTRING = req.QueryString

现在我想产生很好的字符串（不printf的安慰），从该内容，但 queryString.ToString（）显然不是重写，所以它只是给串System.Collections.Specialized.NameValueCollection。

那么，什么是F＃一行程序得到一个不错的串出，像键1 =值\ nkey2 =值2 \ñ......？

解决方案

  nvc.AllKeys
|＆GT; Seq.map（FUN键 - ＆GT;的sprintf％s =％S键雷士照明[关键]）
|＆GT; String.concat\ N
 

Learning F# while trying to do something useful at the same time, so this is kind of basic question:

I have req, which is a HttpListenerRequest, which has QueryString property, with type System.Collections.Specialized.NameValueCollection. So, for sake of clarity let's say, I have

let queryString = req.QueryString

Now I want to produce nice string (not printf to console) from contents of that, but queryString.ToString() is not overriden apparently, so it just gives string "System.Collections.Specialized.NameValueCollection".

So, what's the F# one-liner to get a nice string out of that, like "key1=value1\nkey2=value2\n..."?

解决方案

nvc.AllKeys
|> Seq.map (fun key -> sprintf "%s=%s" key nvc.[key])
|> String.concat "\n"

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