How to ignore -ve value while sorting generic list in c#.

[rahul net11]

Hi all, I want to ignore negative while sorting a generic array list. eg. If list contain following values 0.3 0.2 -0.3 after sofrting it should values should be in following order 0.3 -0.3 0.2 Any solution guyz. Thanks in advance.

People Laugh on me Because i am Different but i Laugh on them Because they all are same.

[Prosanta Kundu online]

Write a class that implements IComparer.

public class myComparer : IComparer
{
public Boolean Descending;
#region IComparer Members

public int Compare(object x, object y)
{
    Double obj1   = (Double)x;
    if (obj1 < 0)  obj1 = -(obj1);

    Double obj2  = (Double)y;
    if (obj2 < 0)  obj2 = -(obj2);

    if (Descending )
    {
        if (obj1 < obj2 )
            return 1;
        if (obj1 > obj2)
            return -1;
    }
    else
    {
       if (obj1 > obj2 )
            return 1;
        if (obj1< obj2)
            return -1;
    }
    return 0;
}

#endregion

}

Pass a object of your custom class in ArrayList.sort method

ArrayList arr = new ArrayList();
arr.Add(0.3);
arr.Add(0.2);
arr.Add(-0.3);

myComparer objComparer = new myComparer();
objComparer.Descending = true;
arr.Sort(objComparer);

modified on Monday, August 30, 2010 5:31 AM

[cramteke]

you can do some thing like this

public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
List<decimal> lstIntCol = new List<decimal>();
lstIntCol.Add(0.3M);
lstIntCol.Add(0.2M);
lstIntCol.Add(-0.3M);
lstIntCol.Sort(new decimalComparer());
foreach (decimal d in lstIntCol)
{
Response.Write(d.ToString() + "--");
}
}
}

public class decimalComparer : System.Collections.Generic.IComparer<decimal>
{

#region IComparer<decimal> Members

public int Compare(decimal x, decimal y)
{
    return decimal.Compare(Math.Abs(y),Math.Abs(x));
}

#endregion

}