C# 检索除一个datamember之外的不同列表

您有一个大列表，目标是检索下面的新列表

今天：

number   color   brand   size   tiresize
-----------------------------------------
1         blue   d       5      6
2         blue   d       5      6
3         red    b       3      3
4         red    b       3      3
etc....

目标：

目标是检索一个有区别的列表，然后删除“编号”

这个示例很小，实际上列表中大约有26个数据成员

我在考虑distinct（），但它考虑了所有datamember，我不想考虑“number”列

当您检索新列表时，请求使用与distincted列表相同的类

public Car
{
    public int number
    public string color
    public string brand
    public string size
    public string tiresize
}

谢谢大家!

var cars=新列表
var cars = new List<Car>
{
   new Car{number = 1, color="blue", brand="d", size = "5", tiresize = "6"},
   new Car{number = 2, color="blue", brand="d", size = "5", tiresize = "6"},
   new Car{number = 3, color="red", brand="b", size = "3", tiresize = "3"},
   new Car{number = 4, color="red", brand="b", size = "3", tiresize = "3"},
};

var distinctCars = cars.GroupBy(x => new {x.color, x.brand, x.size, x.tiresize});                

foreach (var car in distinctCars)
{
   Console.WriteLine(car.Key.color +  ": " + car.Key.brand +  ": " + car.Key.size +  ": " + car.Key.tiresize);
} 

{
新车{number=1，color=“blue”，brand=“d”，size=“5”，tiresize=“6”}，
新车{number=2，color=“blue”，brand=“d”，size=“5”，tiresize=“6”}，
新车{number=3，color=“red”，brand=“b”，size=“3”，tiresize=“3”}，
新车{number=4，color=“red”，brand=“b”，size=“3”，tiresize=“3”}，
};
var distinctCars=cars.GroupBy（x=>new{x.color，x.brand，x.size，x.tiresize}）；
foreach（在distinctCars中的var car）
{
Console.WriteLine（car.Key.color+”：“+car.Key.brand+”：“+car.Key.size+”：“+car.Key.tiresize）；
} 

单向，使用匿名类型，该匿名类型具有内置的

Equals

+

GetHashCode

实现，该实现比较所有属性：

var distinctCars = cars
    .Select(c => new {c.color, c.brand, c.size, c.tiresize})
    .Distinct()
    .Select(x => new Car {color = x.color, brand = x.brand, size = x.size, tiresize = x.tiresize})
    .ToList(();

其他方法是

在

Car

中覆盖

Equals

+

GetHashCode

• 还可以选择实施

  IEquatable

提供一个自定义的

IEqualityComparer

，您可以在

Distinct

---

GroupBy您要检索的字段，，，可以是@AndreaConte建议的GroupBy，也可以是MoreLinq（on nuget）DistinctBy

var distinctCars = cars
    .Select(c => new {c.color, c.brand, c.size, c.tiresize})
    .Distinct()
    .Select(x => new Car {color = x.color, brand = x.brand, size = x.size, tiresize = x.tiresize})
    .ToList(();