将字典转换为结构化格式的字符串

问题描述

我有一个Dictionary对象声明为 var作为Dictionary（of String，String）。

I have a Dictionary object declared as var as Dictionary(of String, String).

我是试图利用可用于Generic Collection的LINQ扩展，但只得到了非扩展方法。

I am trying to utilize the LINQ extensions available to the Generic Collection but am only getting the non-extension methods.

我需要将Dictionary集合转换为具有以下模式的字符串： key1 = val1，key2 = val2，...，keyn = valn

I need to turn the Dictionary collection into a string with the following pattern: key1=val1, key2=val2, ..., keyn=valn

首先要做的是foreach

Thought at first doing a foreach loop would hit the spot except the fact that i am programmers-block.

到目前为止，我仍然了解循环，但是怀疑它是产生这种情况的最佳逻辑模式。

What i have so far, but doubt its the best logic pattern for producing this:

Public Overrides Function ToString() As String
    Dim ret As String = ""
    For Each kv As KeyValuePair(Of String, String) In Me._set
        If ret <> String.Empty Then
            ret &= ", "
        End If

        ret &= String.Format("{0}={1}", kv.Key, kv.Value)
    Next

    Return ret
End Function

发现了LINQ扩展没有显示出来，所以它们又回到了桌面上；）

Found the problem with the LINQ extensions not showing up, so they are back on the table ;)

推荐答案

我会用Linq编写整个方法块像这样（对不起C＃-vb.net汤...）

I would have written the whole method block with Linq like this (sorry for the C#-vb.net soup...)

return String.Join(",",Me._set.Select(kvp=>String.Format("{0}={1}",kvp.Key, kvp.Value).ToArray());

此外，我真的不知道set是什么，也许你会必须强制转换：

Also, I don't really know what _set is. Maybe you'll have to cast :

return String.Join(",", Me._set.Cast<KeyValuePair<String,String>>().Select(kvp=>String.Format("{0}={1}",kvp.Key, kvp.Value).ToArray());

vb.net：

vb.net:

return String.Join(", ", Me.Select(Function(kvp) String.Format("{0}={1}", kvp.Key, kvp.Value)).ToArray())

希望这会有所帮助，

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