LINQ(五) ——使用LINQ进行匿名对象初始化

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C# 语法总目录

6.2 匿名类型

可以不用声明定义一个对象，直接使用new，然后直接赋值即可

string[] names = { "Tom", "Jerry", "kate", "Lucy", "Micky", "li" };

var query =
    from n in names
    select new
    {
        name = n,
        liName = n.ToLower()
    };

foreach (var item in query)
{
    Console.WriteLine(item.liName+","+item.name);
}

Console.WriteLine("--------------");

IEnumerable<string> strName =
    from n in query
    where n.name.Length > 2
    orderby n.name.Length descending
    select n.name + "," + n.liName;

foreach (var item in strName)
{
    Console.WriteLine(item);
}
//输出
tom,Tom
jerry,Jerry
kate,kate
lucy,Lucy
micky,Micky
li,li
--------------
Jerry,jerry
Micky,micky
kate,kate
Lucy,lucy
Tom,tom

使用两个数组，分别取出两个数组元素的索引，进行比较，然后拼接成一个匿名对象，进行输出。

string[] names = { "Tom", "Jerry", "kate", "Lucy", "Micky", "li" ,"zh"};
int[] ages = { 10, 20, 50, 12, 45, 20 };

var indexedItems = names.Select((value, index) => new { Index = index, Value = value });

var dicar =
    from n in names.Select((value, index) => new { Index = index, Value = value })
    join a in ages.Select((value, index) => new { Index = index, Value = value }) on n.Index equals a.Index
    select new
    {
        name = n.Value,
        age = a.Value
    };

foreach (var item in dicar)
{
    Console.WriteLine($"{item.name},{item.age}");
}
//输出
Tom,10
Jerry,20
kate,50
Lucy,12
Micky,45
li,20

总目录
C# 语法总目录