自定义Linq订购 [英] Custom Linq Ordering

问题描述

我有上千个文件夹，每个文件夹包含一个或多个以下名称的文件:

I have over a thousand folders, each folder contains one or more files with the following names:

无序:

Alison.ext
Heather.ext
Molly.ext
Paula.ext
Sam.ext

已订购:

Molly.ext
Sam.ext
Heather.ext
Alison.ext
Paula.ext

我想编写一个表达式来如上所述对列表进行排序.

I would like to write an expression to sort this list as described above.

推荐答案

//Creating a dictionary with the custom order
var order = "MSHAP";
var orderDict = order.Select((c,i)=>new {Letter=c, Order=i})
                     .ToDictionary(o => o.Letter, o => o.Order);

var list = new List<string>{"A.ext", "H.ext", "M.ext", "P.ext", "S.ext"};

//Ordering by the custom criteria
var result = list.OrderBy(item => orderDict[item[0]]);

代替调用orderDict [item [0]]，您可以拥有一个不错的帮助程序方法，该方法可以处理边缘情况(不存在的字母，null等).但这就是主意.

Instead of calling orderDict[item[0]] you could have a nice helper method that cares for the fringe cases (non existent letters, null, and so on). But that's the idea.

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