Hi,
Originally, you wrote that you were storing the collection in the
session. The cache is quite different from the session and may actually
be causing the unexpected behavior you are observing.
After the following line is executed
ArrayList salesRegions = SalesRegion.getAllActiveSalesRegionsCached();
is salesRegions null? What is the count otherwise?
If you change the line to read as follows
ArrayList salesRegions =
SalesRegions.getAllActiveSalesRegionsUncached();
is salesRegions null? What is the count otherwise?
--
Dave Sexton
Sorry I didnt provide more detail Cor....Heres an example of what im
doing...
//begin code to put collection in cache on SalesRegion class
public static IList getAllActiveSalesRegionsCached()
{
if( System.Web.HttpContext.Current.Cache["getAllActiveSalesRegions"]
== null)
resetCacheOfAllActiveSalesRegions();
return
(ArrayList)System.Web.HttpContext.Current.Cache["getAllActiveSalesRegions"];
}
public static void resetCacheOfAllActiveSalesRegions()
{
System.Web.HttpContext.Current.Cache["getAllActiveSalesRegions"] =
SalesRegion.getAllActiveSalesRegionsQuery();
}
public static IList getAllActiveSalesRegionsUncached()
{
return getAllActiveSalesRegionsQuery();
}
private static IList getAllActiveSalesRegionsQuery()
{
string theQuery = "from SalesRegion s where s.active = true";
return Db.Session.CreateQuery(theQuery).List();
}
//end code cache logic....
//then this is where i use the cached collection in a code behind...
ArrayList salesRegions = SalesRegion.getAllActiveSalesRegionsCached();
ArrayList allSelectedRegionsInActiveCollection =
((InvoiceLineItem)i.invoiceLineItems[0]).getAllSalesRegionsThatAreSelectedInTheActiveCollection();
for(int x=0; x<salesRegions.Count; x++)
{
if(allSelectedRegionsInActiveCollection.Contains(
((SalesRegion)salesRegions[x]) ) )
row.Add("X");
else
row.Add("");
cnt++;
}
if i use the uncached version the contains logic works fine but if i
use the cached version contains fails....
thanks again for all your help
netnet wrote:
No? Could you go into more detail? Im actually using the
myCol.Contains(foo) method.
Contains uses Equals to see if objects are identical (and
some other ways, but Equals is probably the most relevant for you).
If you have not implemented Equals, then it uses Object Equals,
which just test if it is the same object (same location in memory) -
not
if the values are the same.
To illustrate the point try and run the following code:
using System;
using System.Collections.Generic;
namespace E
{
public class A
{
private string s;
public A() : this("")
{
}
public A(string s)
{
this.s = s;
}
public string S
{
get
{
return s;
}
set
{
this.s = value;
}
}
public override string ToString()
{
return s;
}
}
public class B
{
private string s;
public B() : this("")
{
}
public B(string s)
{
this.s = s;
}
public string S
{
get
{
return s;
}
set
{
s = value;
}
}
public override string ToString()
{
return s;
}
public override bool Equals(object o)
{
if (o is B)
{
if (s == ((B)o).S)
{
return true;
}
else
{
return false;
}
}
else
{
return false;
}
}
public override int GetHashCode()
{
return s.GetHashCode();
}
}
public class MainClass
{
public static void Main(string[] args)
{
List<A> lst1 = new List<A>();
lst1.Add(new A("test"));
Console.WriteLine(lst1.Contains(new A("test")));
List<B> lst2 = new List<B>();
lst2.Add(new B("test"));
Console.WriteLine(lst2.Contains(new B("test")));
}
}
}
(it is using generics, but that nothing to do with the effect)
Arne
