获取不同的值了名单，LT的;对象> [英] Get Distinct values out of List<Object>

问题描述

我有一个列表包含束类的实例。每个束对象都有一个海拔属性。

 列表<光束GT;梁=新的List<光束GT; {BEAM1，BEAM2，...}; 
 
公共类束
 {
公共双重提升; 
} 
  

现在我想创建一个列表<双> 包含不同的海拔高度。
例如如何编写接受梁列表如下

  VAR BEAM1 =新梁{高程的方法= 320）; 
变种BEAM2 =新梁{高程= 320）; 
变种BEAM3 =新梁{高程= 640）; 
变种BEAM4 =新梁{高程= 0）; 
 
名单，LT;光束GT;梁=新的List<光束GT; {BEAM1，BEAM2，BEAM3，BEAM4}; 
  

和给出了这样的删除重复的海拔高度：

  listOfElevations = {0，320640} 
  

解决方案

1）使光束实现IComparable：

 公共类梁：IComparable的
 {
公共双重提升; //考虑这个不断变化的财产，顺便说一句。 
 
公众诠释的CompareTo（obj对象）{
如果（OBJ == NULL）回报1; 
 
束流otherBeam = OBJ的光束; 
返回this.Elevation.CompareTo（otherBeam.Elevation）; 
} 
} 
  

2）使用distinct（）：

  VAR listOfElevations = Beams.Distinct（）选择（X => x.Elevation）。.ToList（）; 
  

I have a List that contains instances of Beam class. Each of these Beam objects has an Elevation property.

List<Beam> Beams = new List<Beam> {Beam1, Beam2, ...};

public class Beam
{
    public double Elevation;
}

Now I want to create a List<double> that contains distinct Elevations. For example how to write a method that accepts the Beams list as below

var Beam1 = new Beam { Elevation = 320);
var Beam2 = new Beam { Elevation = 320);
var Beam3 = new Beam { Elevation = 640);
var Beam4 = new Beam { Elevation = 0);

List<Beam> Beams = new List<Beam> {Beam1, Beam2, Beam3, Beam4};

And gives this removing the duplicate elevations:

listOfElevations = {0, 320,640}

解决方案

1) Make Beam implement IComparable:

public class Beam : IComparable
{
    public double Elevation; //consider changing this to property, btw.

    public int CompareTo(object obj) {
         if (obj == null) return 1;

         Beam otherBeam = obj as Beam;
         return this.Elevation.CompareTo(otherBeam.Elevation);
    }
}

2) use Distinct():

var listOfElevations = Beams.Distinct().Select(x=> x.Elevation).ToList();

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