class Customer : IEquatable<Customer>
{
public string FirstName { get; set; }
public string LastName { get; set; }
public string ZipCode { get; set; }
public bool Equals(Customer other)
{
if (ReferenceEquals(null, other)) return false;
return this.FirstName.Equals(other.FirstName) && this.LastName.Equals(other.LastName)
&& this.ZipCode.Equals(other.ZipCode);
}
public override bool Equals(object obj)
{
return this.Equals(obj as Customer);
}
public override int GetHashCode()
{
return this.FirstName.GetHashCode() ^ this.LastName.GetHashCode();
}
}
static void Main(string[] args)
{
List<Customer> allCustomers = new List<Customer>();
allCustomers.Add(new Customer { FirstName = "A", LastName = "V", ZipCode = "11111" });
allCustomers.Add(new Customer { FirstName = "B", LastName = "W", ZipCode = "11111" });
allCustomers.Add(new Customer { FirstName = "C", LastName = "X", ZipCode = "22222" });
allCustomers.Add(new Customer { FirstName = "D", LastName = "Y", ZipCode = "33333" });
allCustomers.Add(new Customer { FirstName = "E", LastName = "Z", ZipCode = "33333" });
List<Customer> subList = new List<Customer>();
subList.Add(new Customer { FirstName = "A", LastName = "V", ZipCode = "11111" });
subList.Add(new Customer { FirstName = "B", LastName = "W", ZipCode = "11111" });
subList.Add(new Customer { FirstName = "C", LastName = "X", ZipCode = "22222" });
//This gives expected answer
var n = subList.Except(allCustomers).ToList();
//This should compare only for those customers who zip matches with Sublist's zip
//This returns customers with zip code "33333" while it should not
var v = allCustomers.Except(subList).ToList();
}
var V 不应返回邮政编码为“33333”的客户。我如何比较才能忽略那些 Zip 不在子列表中的客户?
最佳答案
var zipCodes = subList.Select( c=> c.ZipCode).Distinct().ToList();
var v = allCustomers.Where( c=> zipCodes.Contains(c.ZipCode) )
.Except(subList)
.ToList();
关于c# - 比较列表并返回不存在的对象,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/5782326/