我有一个国家清单.我想按字母顺序排序，除了我想放在第一个的两个国家/地区[英] I have a list of countries. I'd like to sort it alphabetically, except for two countries which I'd like to put first

问题描述

I have a list of countries. I'd like to sort it alphabetically, except for two countries which I'd like to put first. Is there a simple way to modify

from country in Countries
orderby country.Name
select country

to accomplish this?

推荐答案

Try this:

var specialCountries = new[] { "America", "England" };

from country in Countries
orderby specialCountries.Contains(country.Name) descending, country.Name
select country

If this isn't LINQ-to-Objects, you might need to write it slightly differently for it to work, e.g. this might work

from country in Countries
orderby (country.Name == "America" || country.Name == "England") descending, country.Name
select country

其他推荐答案

You can use this trick:

var ordered = Countries.OrderByDescending(c => ConditionHere)
                       .ThenBy(c => c.Name);

for example:

var priorCountries = new[]{ "Italy", "France" };
var ordered = Countries.OrderByDescending(c => priorCountries.Contains(c.Name))
                       .ThenBy(c => c.Name);

其他推荐答案

Your original list, which contains every country.

var originalList = new List<string> { "B", "A", "E", "D", "C", "F" };

An exclusionary list, where you provide the order of items you'd like at the front.

var items = new List<string> { "E", "F" };

Your results.

items.AddRange(originalList.Except(items)
                           .OrderBy(q => q));