如何提取屬性重構

Question

我有這個屬性

public List<PointK> LineList 
{get;set;} 

凡PointK包括以下結構：

string Mark{get;set;} 
double X{get;set;} 
doible Y{get;set;} 

現在，我有以下代碼：

private static Dictionary<string , double > GetY(List<PointK> points) 
    { 
     var invertedDictResult = new Dictionary<string, double>(); 
     foreach (var point in points) 
     { 
      if (!invertedDictResult.ContainsKey(point.Mark)) 
      { 
       invertedDictResult.Add(point .Mark, Math.Round(point.Y, 4)); 
      } 

     } 

     return invertedDictResult; 
    } 


    private static Dictionary<string , double > GetX(List<PointK> points) 
    { 
     var invertedDictResult = new Dictionary<string, double>(); 
     foreach (var point in points) 
     { 
      if (!invertedDictResult.ContainsKey(point.Mark)) 
      { 
       invertedDictResult.Add(point .Mark, Math.Round(point.X, 4)); 
      } 

     } 

     return invertedDictResult; 
    } 

如何重構上述代碼？

Answer 1

你可以使用

private static Dictionary<string , double > GetCoordinate 
        (List<PointK> points, Func<Point, double> selector) 

    { 
     var invertedDictResult = new Dictionary<string, double>(); 
     foreach (var point in points) 
     { 
      if (!invertedDictResult.ContainsKey(point.Mark)) 
      { 
       invertedDictResult.Add(point.Mark, Math.Round(selector(point), 4)); 
      } 

     } 

     return invertedDictResult; 
    } 

，並降低你的方法

private static Dictionary<string , double > GetX(List<PointK> points) 
    {   
     return GetCoordinate(points, p => p.X); 
    }