子列表中的 LinQ OrderBy 特定元素

Question

我有一个类别class

public class Category
{
   public long Id { get; set; }
   public Translation[] Translations { get; set; }
}

和翻译 class

public  class Translation
{
   public string Locale { get; set; }
   public string Name { get; set; }
}

然后我有一个类别列表 List<Category>，其中填充了类别对象。我想根据指定的 Locale 按 Translation 中的 Name 字段的字母顺序排列我的 unorderedCategoryList。

例如我有 3 个类别：

{1, ["EN","aaa"], ["RU","zzz"]}

{2, ["EN","ccc"], ["RU","eee"]}

{3, ["EN","bbb"], ["RU","aaa"]}

使用指定的语言环境对它们进行排序 EN 会得到一个这样排序的列表：

{1, ["EN","aaa"], ["RU","zzz"]}
{3, ["EN","bbb"], ["RU","aaa"]}
{2, ["EN","ccc"], ["RU","eee"]}

然后 RU 像这样：

{3, ["EN","bbb"], ["RU","aaa"]}
{2, ["EN","ccc"], ["RU","eee"]}
{1, ["EN","aaa"], ["RU","zzz"]}

这行代码是我得到的，但它似乎不起作用:

var sortedList = unorderedCategoryList.OrderBy(go => go.Translations.Where(t => t.Locale == "EN").Select(t => t.Name)).ToList();

Answer 1

试试这个：

var sortedList = unorderedCategoryList
                    .OrderBy(go => go.Translations.OrderByDescending(t => t.Name == "EN")).ToList();

未经验证，但我从 here and here

中提取了资源

Answer 2

您可以按如下方式为类别类型创建自定义比较器。

public class CategoryComparer : IComparer<Category>
{
    private string _locale;
    public CategoryComparer(string locale)
    {
        _locale = locale;
    }
    public int Compare(Category x, Category y)
    {
        var orderedX = x.Translations.Where(c=>c.Locale.Equals(_locale)).OrderBy(c=>c.Name);
        var orderedY = y.Translations.Where(c=>c.Locale.Equals(_locale)).OrderBy(c=>c.Name);
        return orderedX.First().Name.CompareTo(orderedY.First().Name);
    }
}

现在您可以排序为

var sortByKey = "EN";
var orderedList = list.OrderBy(x=>x,new CategoryComparer(sortByKey));

Demo Code

子列表中的 LinQ OrderBy 特定元素

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