[英]Group items by content of list
可以说我得到了这样的东西:
public class Subscriber{
public string Name {get; set;}
}
public class SomeData{
public string Content {get; set;}
}
public class InputData {
public Subscriber Subscribers { get; set; }
public IEnumerable<SomeData> DataItems { get; set; }
}
public class QueueItem {
public IEnumerable<Subscriber> Subscribers { get; set; }
public IEnumerable<SomeData> DataItems { get; set; }
}
现在说我得到一个充满“ Subscribers”的List<InputData>
,其中包含每个订户的数据列表。
现在,我想比较每个订阅者的数据列表,并以List<QueueItem>
,如果2个订阅者具有相同的数据项集,则它们将为1 QueueItem
。
希望这有意义
该技术正在将EqualityComparer与Enumerable.SequenceEqual()结合使用
public class Subscriber
{
public string Name { get; set; }
// For compare
public override bool Equals(object obj) { return string.Equals(this.Name, ((Subscriber)obj).Name); }
public override int GetHashCode() { return this.Name.GetHashCode(); }
}
public class SomeData
{
public string Content { get; set; }
// For compare
public override bool Equals(object obj) { return string.Equals(this.Content, ((SomeData)obj).Content); }
public override int GetHashCode() { return this.Content.GetHashCode(); }
}
public class InputData
{
public Subscriber Subscribers { get; set; }
public IEnumerable<SomeData> DataItems { get; set; }
// Should always initialize an empty collection
public InputData() { this.DataItems = new List<SomeData>(); }
}
public class QueueItem
{
public IEnumerable<Subscriber> Subscribers { get; set; }
public IEnumerable<SomeData> DataItems { get; set; }
// Should always initialize an empty collection
public QueueItem() { this.Subscribers = new List<Subscriber>(); this.DataItems = new List<SomeData>(); }
}
public class DataItemsEqualityComparer : EqualityComparer<IEnumerable<SomeData>>
{
public override bool Equals(IEnumerable<SomeData> x, IEnumerable<SomeData> y)
{
return Enumerable.SequenceEqual(x.OrderBy(i => i.Content), y.OrderBy(i => i.Content));
}
public override int GetHashCode(IEnumerable<SomeData> obj)
{
return obj.Select(i => i.GetHashCode()).Sum().GetHashCode();
}
}
用法
var data = new List<InputData>();
var fruits = new[] { new SomeData() { Content = "apple" }, new SomeData() { Content = "pear"} };
var colors = new[] { new SomeData() { Content = "red" }, new SomeData() { Content = "blue" }, new SomeData() { Content = "green" } };
data.Add(new InputData() { Subscribers = new Subscriber() { Name = "Alice" }, DataItems = new List<SomeData>(fruits) });
data.Add(new InputData() { Subscribers = new Subscriber() { Name = "Bob" }, DataItems = new List<SomeData>(colors) });
data.Add(new InputData() { Subscribers = new Subscriber() { Name = "Charlie" }, DataItems = new List<SomeData>(fruits) });
List<QueueItem> groupedData = data.GroupBy(
i => i.DataItems,
i => i.Subscribers,
new DataItemsEqualityComparer())
.Select(i => new QueueItem() { Subscribers = i, DataItems = i.Key }).ToList();
结果
QueueItem :
Subscribers:
- Alice
- Charlie
Data:
- apple
- pear
QueueItem :
Subscribers:
- Bob
Data:
- red
- blue
- green
var queue = Dictionary(Subscriber, List<SomeData>); //And lets just for example add some data var items1 = new List<SomeData>(); items1.Add(new SomeData("test")); items1.Add(new SomeData("test2")); var items2 = new List<SomeData>(); items2.Add(new SomeData("test")); queue.Add(new Subscriber("Peter"), items1); queue.Add(new Subscriber("Luke"), items1); queue.Add(new Subscriber("Anna"), items2); Dictionary<Subscriber, List<SomeData>> myDictionary = queue .GroupBy(o => o.PropertyName) .ToDictionary(g => g.Key, g => g.ToList());
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