刪除重複的對象後，比較表2列出

Question

我有一個問題，除去2列表

public class Pump 
{ 
    public int PumpID { get; set; } 
    public string PumpName { get; set; } 
    public string LogicalNumber { get; set; } 
} 

public void LoadPump() 
{ 
    var pumps = _pumpRepository.GetAll(); // 2 Pump 
    var pumpsActive = _pumpRepository.GetAllActive(); // 1 Pump Active (Pump 1) 
    //i try like this 
    List<Pump> pumpsNonActive = pumps.Except(pumpsActive).ToList(); // Result 2 
    //if like this 
    List<Pump> pumpsNonActive = pumpsActive.Except(pumps).ToList(); // Result 1 (Pump 1) 
} 

我想只得到1結果pumpsNonActive（結果=泵2）重複的對象。任何人都可以幫助我：/

Answer 1

您可以覆蓋Equals或者你可以嘗試以下方法：

List<Pump> pumpsNonActive = pumps.Where(r => !pumpsActive 
              .Any(t => t.PumpID == r.PumpID)) 
            .ToList(); 

這個工作對以下數據集：

List<Pump> pumps = new List<Pump>() 
{ 
    new Pump() { PumpID = 1, LogicalNumber = "SomeName", PumpName="PumpName1"}, 
    new Pump() {PumpID = 2, LogicalNumber = "Number", PumpName = "PumpName2"}, 
    new Pump(){PumpID = 3, LogicalNumber = "Number", PumpName = "PumpName3"}, 
}; 

List<Pump> pumpsActive= new List<Pump>() 
{ 
    new Pump() { PumpID = 1, LogicalNumber = "2", PumpName="3"}, 
}; 

Answer 2

Imeplement

public class Pump: IEquatable<Pump> 
{ 
    public bool Equals(Pump other) 
    { 
      ... 
    } 
} 

Answer 3

實施.Equals(object)和.GetHashCode()。

public class Pump 
{ 
    public int PumpID { get; set; } 
    public string PumpName { get; set; } 
    public string LogicalNumber { get; set; } 

    public override bool Equals(object o) 
    { 
     var casted = o as Pump; 
     if (casted == null) 
      return false; 

     return PumpID == o.PumpID; 
    } 

    public override int GetHashCode() 
    { 
     return PumpID.GetHashCode(); 
    } 
}