[英]How to sort on 2 distinct rules in List<string>
I need to sort a List<string>
following 2 rules. 我需要按照2条规则对
List<string>
进行排序。
My string
element will always be formatted as XXXnnnnE
or XXXnnnnD
where X
are capitalized letters from A to Z and n
are digit from 0 to 9. 我的
string
元素将始终设置为XXXnnnnE
或XXXnnnnD
,其中X
是从A到Z的大写字母, n
是从0到9的数字。
I want to sort my list alphabetically, but I want E
string to come before D
string as shown below 我想按字母顺序对列表进行排序,但我希望
E
字符串位于D
字符串之前,如下所示
DFG0001D
AWK0007E
ORK0127E
AWK0007D
DFG0001E
ORK0127D
need to be sorted as 需要排序为
AWK0007E
AWK0007D
DFG0001E
DFG0001D
ORK0127E
ORK0127D
How could I achieve this ? 我怎样才能做到这一点?
Thanks for help 感谢帮助
Here is snippet how you can do this with Linq OrderBy and ThenByDescending operations: 以下是如何使用Linq OrderBy和ThenByDescending操作做到这一点的代码段:
string[] arr = { "DFG0001D", "AWK0007E", "ORK0127E", "AWK0007D", "DFG0001E", "ORK0127D" };
arr = arr
.OrderBy(r => r.Substring(0, 7))
.ThenByDescending(s => s.Substring(7, 1))
.ToArray();
you can use a custom delegate and compare the 1st 3 chars and the last one: 您可以使用自定义委托并比较第一个3个字符和最后一个3个字符:
List<string> x = new List<string>();
x.Add("DFG0001D");
x.Add("AWK0007E");
x.Add("ORK0127E");
x.Add("AWK0007D");
x.Add("DFG0001E");
x.Add("ORK0127D");
x.Sort(delegate(string c1, string c2) {
string a = c1.Substring(0, 3)+c1.Substring(c1.Length-1, 1);
string b = c2.Substring(0, 3)+c2.Substring(c2.Length-1, 1);
return (a.CompareTo(b));
});
Console.WriteLine("After sort...");
foreach (string i in x)
{
Console.WriteLine(i);
}
Fiddle example : https://dotnetfiddle.net/YAzvB4 小提琴示例: https : //dotnetfiddle.net/YAzvB4
just implement your own comparer like this: 只需像这样实现自己的比较器:
class CustomStringComparer : IComparer<string>
{
private readonly IComparer<string> _baseComparer;
public CustomStringComparer(IComparer<string> baseComparer)
{
_baseComparer = baseComparer;
}
public int Compare(string x, string y)
{
// strings are completely same
if (_baseComparer.Compare(x, y) == 0)
{
return 0;
}
// strings are completely same except last char
if (_baseComparer.Compare(x.Substring(0, x.Length - 2), y.Substring(0, y.Length - 2)) == 0)
{
// if last char is E then win
return x.Last() == 'E' ? -1 : 1;
}
// defaut compare everything else
return _baseComparer.Compare(x, y);
}
}
Then you are able doing this: 然后,您可以执行以下操作:
static void Main(string[] args)
{
List<string> list = new List<string>()
{
"DFG0001D",
"AWK0007E",
"ORK0127E",
"AWK0007D",
"DFG0001E",
"ORK0127D"
};
list.Sort(new CustomStringComparer(StringComparer.CurrentCulture));
foreach (var item in list)
{
Console.WriteLine(item);
}
}
And output is this: 输出是这样的:
AWK0007E
AWK0007D
DFG0001E
DFG0001D
ORK0127E
ORK0127D
var list = new List<string>{
"DFG0001D",
"AWK0007E",
"ORK0127E",
"AWK0007D",
"DFG0001E",
"ORK0127D"
};
list.Sort((str1, str2) => {
var eq = string.Compare(str1.Substring(0, str1.Length - 1), str2.Substring(0, str2.Length - 1));
if (eq == 0)
eq = string.Compare(str2[str2.Length - 1].ToString(), "E");
return eq;
});
foreach (var str in list)
Console.WriteLine(str);
Output: 输出:
AWK0007E
AWK0007D
DFG0001E
DFG0001D
ORK0127E
ORK0127D
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