Hi All,
My background is that i am new to C- Sharp and OOP. I have been working with
it for about 2 Weeks. I do have good experionce in developing in things like
VB6, COM, ASP, JavaScript and i have done some development with VB.Net but
it was not really done in an OOP fashion. i have Been asked to take over a
PDA application that has been writen in C-Sharp 2005.
My Question.
The application is holting in Memory an ArrayList of Tasks that it has
De-Serialized from an XML data file on the PDA.
Now I need to Sort the data buy 3 Columns (These have been setup as
properties of the object "I Think?") just like you would in an SQL (OrderBy
Age, Fname, Lname)
I have been reading all day and i still can not figure out how to do this.
Below is a Code Snippet i think might work but i reall am batteling to
understand it and i Can not figger out how to use it to get what i want.
If some one could please help me by just comment each line for me with and
explenation on what each part of it means and how it is working i would be
very greatefull.
Even the smallest details would be most beneficial for me, and would be much
appriciated.
Many Thanks,
Ink
using System;
using System.Collecti ons.Generic;
using System.Text;
using System.Collecti ons;
using System.Reflecti on;
namespace PPCAssetClient. Helpers
{
public class ArrayCompareCla ss : IComparer
{
private string compareby = "";
private string[] subprops = null;
#region IComparer Members
public void SortBy(string compareby)
{
this.compareby = compareby;
}
public string[] SubProperties
{
get { return subprops; }
set { subprops=value; }
}
public int Compare(object x, object y)
{
try
{
PropertyInfo xinfo = null, yinfo = null;
object subitemx = null, subitemy = null;
if (subprops != null)
{
foreach (string item in subprops)
{
if ((subitemx != null) && (subitemy != null))
{
subitemx = xinfo.GetType() .GetProperty(it em).GetValue(x, null);
subitemy = yinfo.GetType() .GetProperty(it em).GetValue(y, null);
if ((subitemx == null) && (subitemy == null))
{
//Item not found
break;
}
}
else
{
subitemx = x.GetType().Get Property(item). GetValue(x, null);
subitemy = y.GetType().Get Property(item). GetValue(y, null);
}
}
}
object xvalue = null, yvalue = null;
if ((subitemy != null) && (subitemx != null))
{
xvalue =
subitemx.GetTyp e().GetProperty (this.compareby ).GetValue(subi temx,null);
yvalue =
subitemy.GetTyp e().GetProperty (this.compareby ).GetValue(subi temy,null);
if ((yvalue != null) && (xvalue != null))
{
return Comparer.Defaul tInvariant.Comp are(xvalue, yvalue);
}
}
else
{
xvalue = x.GetType().Get Property(this.c ompareby).GetVa lue(subitemx, null);
yvalue = y.GetType().Get Property(this.c ompareby).GetVa lue(subitemy, null);
if ((yvalue != null) && (xvalue != null))
{
return Comparer.Defaul tInvariant.Comp are(xvalue, yvalue);
}
}
}
catch (Exception)
{
}
return 0;
}
#endregion
}
}
My background is that i am new to C- Sharp and OOP. I have been working with
it for about 2 Weeks. I do have good experionce in developing in things like
VB6, COM, ASP, JavaScript and i have done some development with VB.Net but
it was not really done in an OOP fashion. i have Been asked to take over a
PDA application that has been writen in C-Sharp 2005.
My Question.
The application is holting in Memory an ArrayList of Tasks that it has
De-Serialized from an XML data file on the PDA.
Now I need to Sort the data buy 3 Columns (These have been setup as
properties of the object "I Think?") just like you would in an SQL (OrderBy
Age, Fname, Lname)
I have been reading all day and i still can not figure out how to do this.
Below is a Code Snippet i think might work but i reall am batteling to
understand it and i Can not figger out how to use it to get what i want.
If some one could please help me by just comment each line for me with and
explenation on what each part of it means and how it is working i would be
very greatefull.
Even the smallest details would be most beneficial for me, and would be much
appriciated.
Many Thanks,
Ink
using System;
using System.Collecti ons.Generic;
using System.Text;
using System.Collecti ons;
using System.Reflecti on;
namespace PPCAssetClient. Helpers
{
public class ArrayCompareCla ss : IComparer
{
private string compareby = "";
private string[] subprops = null;
#region IComparer Members
public void SortBy(string compareby)
{
this.compareby = compareby;
}
public string[] SubProperties
{
get { return subprops; }
set { subprops=value; }
}
public int Compare(object x, object y)
{
try
{
PropertyInfo xinfo = null, yinfo = null;
object subitemx = null, subitemy = null;
if (subprops != null)
{
foreach (string item in subprops)
{
if ((subitemx != null) && (subitemy != null))
{
subitemx = xinfo.GetType() .GetProperty(it em).GetValue(x, null);
subitemy = yinfo.GetType() .GetProperty(it em).GetValue(y, null);
if ((subitemx == null) && (subitemy == null))
{
//Item not found
break;
}
}
else
{
subitemx = x.GetType().Get Property(item). GetValue(x, null);
subitemy = y.GetType().Get Property(item). GetValue(y, null);
}
}
}
object xvalue = null, yvalue = null;
if ((subitemy != null) && (subitemx != null))
{
xvalue =
subitemx.GetTyp e().GetProperty (this.compareby ).GetValue(subi temx,null);
yvalue =
subitemy.GetTyp e().GetProperty (this.compareby ).GetValue(subi temy,null);
if ((yvalue != null) && (xvalue != null))
{
return Comparer.Defaul tInvariant.Comp are(xvalue, yvalue);
}
}
else
{
xvalue = x.GetType().Get Property(this.c ompareby).GetVa lue(subitemx, null);
yvalue = y.GetType().Get Property(this.c ompareby).GetVa lue(subitemy, null);
if ((yvalue != null) && (xvalue != null))
{
return Comparer.Defaul tInvariant.Comp are(xvalue, yvalue);
}
}
}
catch (Exception)
{
}
return 0;
}
#endregion
}
}
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