AlphaNumericStringComparer.cs
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using System;
using System.Collections.Generic;
using System.Text;
using System.Collections;
using System.Windows.Forms;
namespace MoyaAdminLib
{
public class AlphaNumericStringComparer : IComparer<string>
{
public int ColumnIndex;
public bool SortOrderDesc;
public AlphaNumericStringComparer()
{
ColumnIndex = 0;
}
public AlphaNumericStringComparer(int column)
{
ColumnIndex = 0;
}
public AlphaNumericStringComparer(int column, bool sortOrderDesc)
{
this.SortOrderDesc = sortOrderDesc;
ColumnIndex=column;
}
public int Compare(string x, string y)
{
if (x == null)
x = "";
if(y == null)
y = "";
decimal num1 = 0;
decimal num2 = 0;
if (Decimal.TryParse(x, out num1) && Decimal.TryParse(y, out num2))
{
return Compare(num1, num2);
}
int len1 = x.Length;
int len2 = y.Length;
int marker1 = 0;
int marker2 = 0;
// Walk through two the strings with two markers.
while (marker1 < len1 && marker2 < len2)
{
char ch1 = x[marker1];
char ch2 = y[marker2];
// Some buffers we can build up characters in for each chunk.
char[] space1 = new char[len1];
int loc1 = 0;
char[] space2 = new char[len2];
int loc2 = 0;
// Walk through all following characters that are digits or
// characters in BOTH strings starting at the appropriate marker.
// Collect char arrays.
do
{
space1[loc1++] = ch1;
marker1++;
if (marker1 < len1)
{
ch1 = x[marker1];
}
else
{
break;
}
} while (char.IsDigit(ch1) == char.IsDigit(space1[0]));
do
{
space2[loc2++] = ch2;
marker2++;
if (marker2 < len2)
{
ch2 = y[marker2];
}
else
{
break;
}
} while (char.IsDigit(ch2) == char.IsDigit(space2[0]));
// If we have collected numbers, compare them numerically.
// Otherwise, if we have strings, compare them alphabetically.
string str1 = new string(space1);
string str2 = new string(space2);
int result;
if (char.IsDigit(space1[0]) && char.IsDigit(space2[0]))
{
int thisNumericChunk = int.Parse(str1);
int thatNumericChunk = int.Parse(str2);
result = thisNumericChunk.CompareTo(thatNumericChunk);
}
else
{
result = str1.CompareTo(str2);
}
if (result != 0)
{
return result;
}
}
return len1 - len2;
}
public int Compare(decimal x, decimal y)
{
if (x > y)
return 1;
else if (x < y)
return -1;
else
return 0;
}
}
}