如何比较字符串小于或大于其他字符串？ [英] how to compare string like less than or greater than other string?

问题描述

你好，



我正在开发一个项目，即我将新的字母数字代码分配给选定的字符串。



即字符串是A000到A010

hello ,

I am develpoing one project , in that im assigning the New alpha numeric code to the selected strings.

i.e strings are A000 to A010

string s1 = A000 and String s2= A010;
 here String s3 is new string is retrived between s1 ande s2
here i need to do 

 if (s1 <= s3 && s3>=s2);
{ 
here i want to insert Alphanumeric code from s1 to s2;
}

适用或任何新建议。





感谢你

is it applicable or any new suggestions.


Thanking you

推荐答案

你可能意味着关注！

You probably meant following!

List<string> list = new List<string>();
for (int index=0; index<=10; index++)
{
  List.Add(string.format("A{0:D3}", index);
}
</string></string>

如果您的要求是使用字母数字值以正确的顺序添加项目，请检查以下示例代码

if your requirement is adding items in correct order by using alphanumeric values, check below sample code

void Main()
{
	SortedList<string,student> list = new SortedList<string,student>(new MyComparer());
	list.Add("A000",new Student(){Name ="A"});
	list.Add("A010",new Student(){Name ="F"});
	list.Add("A005",new Student(){Name ="G"});
	//list.Dump();
}
class MyComparer : IComparer<string>
{
   public int Compare(string a, string b)
   {
       var x = int.Parse(Regex.Replace(a, "[^0-9]", ""));
        var y = int.Parse(Regex.Replace(b, "[^0-9]", ""));
        if (x != y) return x - y;
        return -1 * string.Compare(a, b);
   }
}

class Student 
{
  public string Name{get;set;}
}

</string>

你可以使用SortedList，它会根据给定的比较器对项目进行排序，这里我为您的字母数字值添加了自定义比较器。

you can use SortedList and it will sort item based on given comparer, here i have added custom comparer for your alphanumeric values.

.NET String对象有一个内置的比较方法...使用它！

http://msdn.microsoft.com/en-us/library/System.String 。比较（v = vs.110）.aspx [ ^ ]

.NET String object has a built in comparison method...Use it!
http://msdn.microsoft.com/en-us/library/System.String.Compare(v=vs.110).aspx[^]

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