如何排序字符串列表？ [英] How to sort string list?

问题描述

I am working on one project and now i am stuck on very silly program i.e sorting list.
I have list of items range between 0-500 . and items like (e.g "45848^kjf,10" , "450240^jdk,20" , "448278^dj,30"). 
My current code sort list in decending order but the order gets wrong result . i.e

1. 45848^kjf,10
2. 450240^jdk,20
3. 448278^dj,30

I want to sort list items with respective to the number before "^" this symbol and 45848 is smaller than below two numbers so, my expected result is  

1. 450240^jdk,20
2. 448278^dj,30
3. 45848^kjf,10

How can i get this result?  here is my code,

我尝试过：

What I have tried:

listcode.Sort(); // listcode is String list
               listcode.Reverse();

推荐答案

尝试

try

string[] items = { "45848^kjf,10", "450240^jdk,20", "448278^dj,30" };
          var listcode = items.ToList();
         var result =  listcode.Select(k => new { value = int.Parse( k.Substring(0, k.IndexOf('^'))), item = k }).OrderByDescending(k => k.value).Select(k => k.item).ToList();

有两种方法可以做这个 - 您需要实现 IComparer< string> 或比较委托。在调用sort方法时，第二种方法可以很容易地作为lambda委托来完成。

There are two ways of doing this - you either need to implement an IComparer<string>, or a Comparison delegate. The second method can easily be done as a lambda delegate in your call to the sort method.

listcode.Sort(delegate(string1, string2) {
    int num1, num2;
    try {
        num1 = int.Parse(string1.SubString(0, string1.IndexOf('^')));
        num2 = int.Parse(string2.SubString(0, string2.IndexOf('^')));
        return num1.CompareTo(num2);
    }
    catch {
        // Handle the case one of the strings are not in correct format
    }
});

否则，创建一个实现IComparer的类< string> ;。这个类将有一个比较（string1，string2）方法，它几乎与上面的lambda委托相同。然后你调用 listcode.Sort（new MyComparerClass（））; 。查看 IComparer的MSDN文档 [ ^ ]以获取如何实现的示例。

Otherwise, create a class that implements IComparer<string>. This class will have a Compare(string1, string2) method in it, which will pretty much be identical to the lambda delegate above. Then you call listcode.Sort(new MyComparerClass());. Look at the MSDN documentation for IComparer[^] for an example of how to implement.

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