[英]C# order list by two different things
假設我有以下列表:
var someList = new List<SomeObject>();
其中有以下條目:
SomeObject.Field
Apple
Orange
FruitBowl_Outside
Banana
Grape
FruitBowl_Inside
我想對這個列表進行排序,以便FruitBowl
條目 go 在底部,並且受此限制,所有內容都是字母順序。
用順序的話:
SomeObject.Field
Apple
Banana
Grape
Orange
FruitBowl_Inside
FruitBowl_Outside
您可以創建自己的 IComparer 並將其傳遞給 List.Sort 方法。 我會盡快發布代碼。
List<Record> list = new List<Record>();
list.Add(new Record("Apple"));
list.Add(new Record("Orange"));
list.Add(new Record("FruitBowl_Outside"));
list.Add(new Record("Banana"));
list.Add(new Record("Grape"));
list.Add(new Record("FruitBowl_Inside"));
list.Sort(new RecordComparer());
public class Record {
public Record(string data) {
this.data = data;
}
private string data;
public string Data {
get { return data; }
set {
data = value;
}
}
}
public class RecordComparer : IComparer<Record> {
public int Compare(Record x, Record y) {
if(x.Data.Contains("FruitBowl") && !y.Data.Contains("FruitBowl"))
return 1;
if(y.Data.Contains("FruitBowl") && !x.Data.Contains("FruitBowl"))
return -1;
return x.Data.CompareTo(y.Data);
}
}
怎么樣:
someList.OrderBy(a => a.Field.StartsWith("FruitBowl")).ThenBy(a => a.Field);
您可以將 List.Sort() 與自定義比較方法一起使用 - 請參見此處。
這個怎么樣↓
someList.Sort(new Comparison<string>((x, y) => { return x.StartsWith("FruitBowl") ^ y.StartsWith("FruitBowl") ? (x.StartsWith("FruitBowl") ? 1 : -1) : x.CompareTo(y); }));
並與樣品↓
static void Main(string[] args)
{
List<string> lstData = new List<string>()
{
"Apple",
"Orange",
"FruitBowl_Outside",
"Banana",
"Grape",
"FruitBowl_Inside"
};
lstData.Sort(new Comparison<string>((x, y) => { return x.StartsWith("FruitBowl") ^ y.StartsWith("FruitBowl") ? (x.StartsWith("FruitBowl") ? 1 : -1) : x.CompareTo(y); }));
foreach (string data in lstData)
Console.WriteLine(data);
Console.ReadLine();
}
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