Question

我有以下课程的两个集合

public class ABC
{
   public int studentId {get;set;}
   public int schoolId {get;set;}
   // Class has other properties too both above two are the keys

}

现在我有两个ABC

的集合

  ICollection<ABC> C1 = {Some Data}
  ICollection<ABC> C2 = {Some Data}

我想在C1中找到基于键i-e StudentId和SchoolId的C2中不存在的ABC对象

Answer 1

使用Except

var diff = C1.Except(C2)

请注意，为了跟踪相等性，您可以覆盖Equals方法，或者实现IEqualityComparer并将其传递给Except方法

class ABCEqualityComparer : IEqualityComparer<ABC>
{
    public bool Equals(ABC b1, ABC b2)
    {
         return (b1.studentId == b2.studentId) && (b1.schoolId == b2.schoolId)
    }

    public int GetHashCode(ABC b)
    {
        return 7*b.studentId.GetHashCode() + b.schoolId.GetHashCode();
    }
}

比你可以使用

var diff = C1.Except(C2, new ABCEqualityComparer())

如何在C＃中的两个集合<t>中找到差异

1 个答案: