主页 / 问题 / 598493
Accepted
Berianidze Luka
Asked:2020-12-02 13:30:36 +0000 UTC2020-12-02 13:30:36 +0000 UTC

按列表搜索<>

  • 772

假设有一堂课

public class Information
{
    public string Name;
    public string Surname;
    public int Age;
}

还有一类：

public class InfoByCities
{
    public List<InFormation> Moscow;
    public List<InFormation> Saint_Petersburg;
    public List<InFormation> Rostov;
}

填写这些List<>：

InfoByCities fill = new InfoByCities();
int Amount = 1500;

fill.Moscow = new List<Information>(Amount);
for (int i = 0; i < Amount; i++)
{
     Information inf = new Information();
     inf.Name = "Саша"+ i.ToString();
     inf.Surname = "Поляков" + i.ToString();
     inf.Age = i;
     fill.Moscow.Add(inf);
}

fill.Saint_Petersburg = new List<Information>(Amount); 
for (int i = 0; i < Amount; i++)
{
     Information inf = new Information();
     inf.Name = "Пётр" + i.ToString();
     inf.Surname = "Поляков" + i.ToString();
     inf.Age = i;
     fill.Saint_Petersburg.Add(inf);
}

fill.Rostov = new List<Information>(Amount);
for (int i = 0; i < Amount; i++)
{
     Information inf = new Information();
     inf.Name = "Саша" + i.ToString();
     inf.Surname = "Петухов" + i.ToString();
     inf.Age = i;
     fill.Rostov.Add(inf);
}

问题：如何在List<>不单独引用每个人的情况下实现对所有人的搜索。例如，要在所有三个列表中查找名称为“Sasha”的人。数量List<>可能更多。

c#

1 个回答

  1. Best Answer

    假设我们有一个fill类型的变量InfoByCities。首先，您需要合并列表：

    var informations = new List<List<Information>>
{
    fill.Moscow, fill.Saint_Petersburg, fill.Rostov
};

var informationArray = informations.SelectMany(i => i).ToArray();

    接下来，我们进行 LINQ 查询：

    var sashas = informationArray.Where(i => i.Name == "Саша").ToArray();
    • 6

相关问题