how to compare string like less than or greater than other string?

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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

C#

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;
}

is it applicable or any new suggestions.

Thanking you

Posted 14-Jan-15 1:07am

Mr.VJ

Updated 14-Jan-15 1:10am

Kornfeld Eliyahu Peter

v2

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Ankur^\m/ 14-Jan-15 7:24am

Do you mean you just need to extract the numeric part and compare them?

3 solutions

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_Asif_ · Answer 1 · 2015-01-14T01:36:00

Solution 2

You probably meant following!

C#

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

Posted 14-Jan-15 1:36am

_Asif_

DamithSL · Answer 2 · 2015-01-14T01:46:00

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

C#

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>

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

Kornfeld Eliyahu Peter · Answer 3 · 2015-01-14T01:11:00

Solution 1

.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[^]

Posted 14-Jan-15 1:11am