使用对象作为SortedList的键<；对象，值>；在c#中

本文关键字：对象 gt SortedList 的键 lt | 更新日期: 2023-09-27 18:20:25

如何在c#中将Object定义为SortedList的Key。

在这里，我想定义一个像这样的关键对象

   MyKey key = new MyKey();
   key.type = 3; // can be 3,2 or 1
   key.time = 2014-05-03 // DateTime in c# with timestamp
   key.sequence = 5567 // a number unique to the combination above

我想根据优先级类型、时间和顺序对这个排序列表进行排序。我该如何做到这一点？

使用对象作为SortedList的键<；对象，值>；在c#中

C#中的SortedList使用IComparable接口对列表进行排序。因此，要实现这一点，u必须实现IComparable接口。请参阅：https://msdn.microsoft.com/en-us/library/system.icomparable.compareto（v=vs.110）.aspx

例如：

public class Key : IComparable
{
    public int Type {get; set; }
    public DateTime Time { get; set; }
    public int Sequence { get; set; }
    int IComparable.CompareTo(object obj)
    {
        Key otherKey = obj as Key;
        if (otherKey == null) throw new ArgumentException("Object is not a Key!");
        if (Type > otherKey.Type)
            return 1;
       return -1;
    }
}

使用排序列表：

SortedList<Key,string> collection = new SortedList<Key, string>();
collection.Add(new Key { Type = 2 }, "alpha");
collection.Add(new Key { Type = 1 }, "beta");
collection.Add(new Key { Type = 3 }, "delta");
foreach (string str in collection.Values)
{
    Console.WriteLine(str);
}

这写道：

β

α

Δ

创建一个自定义Comparer<myKey>并将其传递给SortedList构造函数：

public class TypeComparer : Comparer<MyKey>
{
    public override int Compare(MyKey x, MyKey y)
    {
        if (ReferenceEquals(x, y)) return 0;
        int typeX = int.MinValue;
        int typeY = int.MinValue;
        if (x != null) typeX = x.type;
        if (y != null) typeY = y.type;
        return typeX.CompareTo(typeY);
    }
}

现在你可以使用这个构造函数：

var sl = new SortedList<MyKey, string>(new TypeComparer());

如果我理解正确：

static void Main(string[] args)
{
    Dictionary<MyKey, string> fooDictionary = new Dictionary<MyKey, string>();
    fooDictionary.Add(new MyKey() {FooNumber=1, Sequence=50 }, "1");
    fooDictionary.Add(new MyKey() { FooNumber = 2, Sequence = 40 }, "2");
    fooDictionary.Add(new MyKey() { FooNumber = 3, Sequence = 30 }, "3");
    fooDictionary.Add(new MyKey() { FooNumber = 4, Sequence = 20 }, "4");
    fooDictionary.Add(new MyKey() { FooNumber = 5, Sequence = 10 }, "5");
    var result = from c in fooDictionary orderby c.Key.Sequence select c;
    Console.WriteLine("");   
}
class MyKey
{
    public int FooNumber { get; set; }
    public DateTime MyProperty { get; set; }
    public int Sequence { get; set; }
}
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