排序字符串数组列表c#

Question

我有一个字符串数组列表,其中数组格式为[Animal,Breed,Name]:

{ ["Dog", "Golden Retriever", "Rex"],
  ["Cat", "Tabby", "Boblawblah"],
  ["Fish", "Clown", "Nemo"],
  ["Dog", "Pug", "Daisy"],
  ["Cat", "Siemese", "Wednesday"],
  ["Fish", "Gold", "Alaska"]
}

我如何对这个列表进行排序,使其按"字母"按字母顺序排列,然后按"品种"排列？即:

{ ["Cat", "Siamese", "Boblawblah"],
  ["Cat", "Tabby", "Wednesday"],
  ["Dog", "Golden Retriever", "Rex"],
  ["Dog", "Pug", "Daisy"],
  ["Fish", "Clown", "Nemo"],
  ["Fish", "Gold", "Alaska"]
}

我目前正在尝试:

animalList.Sort((s, t) => String.Compare(s[0], t[0]));

但这并没有正确排序第二列.除了按字母顺序按前两列排序外,我如何在第三列中添加？

Answer 1

您可以使用LINQ:

animalList = animalList
    .OrderBy(arr => arr[0])
    .ThenBy(arr  => arr[1])
    .ToList();

你的样本:

List<string[]> animalList = new List<String[]>{ 
            new []{"Dog", "Golden Retriever", "Rex"},
            new []{"Cat", "Tabby", "Boblawblah"},
            new []{"Fish", "Clown", "Nemo"},
            new []{"Dog", "Pug", "Daisy"},
            new []{"Cat", "Siemese", "Wednesday"},
            new []{"Fish", "Gold", "Alaska"}
        };

结果:

-       [0] {string[3]} string[]
        [0] "Cat"   string
        [1] "Siemese"   string
        [2] "Wednesday" string
-       [1] {string[3]} string[]
        [0] "Cat"   string
        [1] "Tabby" string
        [2] "Boblawblah"    string
-       [2] {string[3]} string[]
        [0] "Dog"   string
        [1] "Golden Retriever"  string
        [2] "Rex"   string
-       [3] {string[3]} string[]
        [0] "Dog"   string
        [1] "Pug"   string
        [2] "Daisy" string
-       [4] {string[3]} string[]
        [0] "Fish"  string
        [1] "Clown" string
        [2] "Nemo"  string
-       [5] {string[3]} string[]
        [0] "Fish"  string
        [1] "Gold"  string
        [2] "Alaska"    string

Answer 2

你可以做:

var newList = list.OrderBy(r => r[0])
                  .ThenBy(r => r[1])
                  .ThenBy(r => r[2])
                  .ToList();

这将假设您List将拥有一个字符串数组元素,其长度至少为 3个项目.这将基于阵列的第一个项目,首先对列表进行排序Animal,然后Bread再Name.

如果您List的定义为:

List<string[]> list = new List<string[]> { new [] {"Dog", "Golden Retriever", "Rex"},
                                           new [] { "Cat", "Tabby", "Boblawblah"},
                                           new [] {"Fish", "Clown", "Nemo"},
                                           new [] {"Dog", "Pug", "Daisy"},
                                           new [] {"Cat", "Siemese", "Wednesday"},
                                           new [] {"Fish", "Gold", "Alaska"}
                                            };

一个更好的方式来处理这个问题将有自定义类,与Type,Bread和Name财产,然后用这个来代替string[]

您可以定义自己的类:

public class Animal
{
    public string Type { get; set; }
    public string Bread { get; set; }
    public string Name { get; set; }

    public Animal(string Type, string Bread, string Name)
    {
        this.Type = Type;
        this.Bread = Bread;
        this.Name = Name;
    }
}

然后定义你的List<Animal>喜欢:

List<Animal> animalList = new List<Animal>
{
    new Animal("Dog", "Golden Retriever", "Rex"),
    new Animal("Cat", "Tabby", "Boblawblah"),
    new Animal("Fish", "Clown", "Nemo"),
    new Animal("Dog", "Pug", "Daisy"),
    new Animal("Cat", "Siemese", "Wednesday"),
    new Animal("Fish", "Gold", "Alaska"),
};

稍后您可以获得如下排序列表:

List<Animal> sortedList = animalList
                            .OrderBy(r => r.Type)
                            .ThenBy(r => r.Bread)
                            .ToList();

如果需要,可以实现自己的自定义排序,请参阅:如何在Visual C#中使用IComparable和IComparer接口