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Obtain & check items in Generic list

Posted on 2006-11-28
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Last Modified: 2010-07-27
I'm new to generics, and trying to check to see if the list I get back has any values.  So far I've been unsuccessful in figuring out how to check this.  Here's how I defined my generic list in the page I'm working with:

    private List<sss.DataTier.Categories.Category> categoryList = new List<sss.DataTier.Categories.Category>();

...

    private void LoadCategoryList()
    {
        categoryList = sss.DataTier.Categories.CategoryContentItem.GetCategoryList(sss.DataTier.Categories.ContentItemType.Values.RecipeVersion, recipeVersionID);
    }

and finallly here's my If statement in which I'm trying to figure out how to check the list for categories:

    protected bool CheckRequiredCategory()
    {
        if (categoryList. < 1) <<Not sure what to do here
        {
            return false;
        }
        else
        {
            return true;
        }

Here's a print screen of values I get as options for the list: http://www.webfound.net/forum_posts/list_options.jpg

the type of records we're populating the list have column values such as the following:

            C.CategoryID,
            C.ParentCategoryID,
            C.Name,
            C.Description,
                                 ...
      

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Question by:dba123
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11 Comments
 
LVL 7

Accepted Solution

by:
mjmarlow earned 2000 total points
ID: 18034137
List has a property "Count" that you can access to get the number of items in it.

if(categoryList.Count > 0)
{
  // categoryList has items in it
}
0
 
LVL 1

Author Comment

by:dba123
ID: 18034143
yea, I did try that but it didn't like it, gave me an error.  I will post that error tomorrow...thanks.
0
 
LVL 7

Expert Comment

by:mjmarlow
ID: 18034155
While I certainly love to get layups like these, I would be a schmo if i didn't point you to a great source of information.  In VS 2005, double click on the word List in your source file, then press F1 key.  A help file will launch with details about the "List" class.
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LVL 1

Author Comment

by:dba123
ID: 18034265
cool, thanks!  I will also post that error tomorrow.  I had actually this when I tried it before I posted this thread:

if(categoryList.Count == 0)
{
  // categoryList has items in it
}
0
 
LVL 7

Expert Comment

by:mjmarlow
ID: 18036444
One reason that you would get a runtime error is if sss.DataTier.Categories.CategoryContentItem.GetCategoryList is returning null.  

One reason you would get a compile time error is if sss.DataTier.Categories.CategoryContentItem.GetCategoryList does not return List<sss.DataTier.Categories.Category>

0
 
LVL 1

Author Comment

by:dba123
ID: 18037278
ok, so if it returns null, how can I tell it not to error out and to change the null into zero?
0
 
LVL 1

Author Comment

by:dba123
ID: 18037606
hmm, when I go to the properties of my .sln which is tied to all the projects I'm working with for this site, they're set to 'debug' in the configuration properties.  So not sure what else here...
0
 
LVL 1

Author Comment

by:dba123
ID: 18037665
also, comparing against 0 or < 1 doesnt' seem to work, it may be null.

doing this "seems" to work but I can't get my debug points to fire when using IIS mode

if (categoryList.Count == null)
0
 
LVL 1

Author Comment

by:dba123
ID: 18037782
ok, I asked a team member.  Here's what I had to do.   I had set it to the worker process, however it was set to try to debug SQL.  So I changed the following

1) Attach to worker process
2) Before clicking OK, changed the "Attach to" to Managed Code using the Select button.  It was set to "Automatically determine the type of code to debug" prior which is why it was trying to debug my SQL instead of my managed code
0
 
LVL 1

Expert Comment

by:jagadeeshbandlamudi
ID: 18098340
private List<sss.DataTier.Categories.Category> categoryList = new List<sss.DataTier.Categories.Category>();
sss.DataTier.Categories.Category oSdc = new sss.DataTier.Categories.Category();
  oSdc.CategoryID=000;
   oSdc.ParentCategoryID=000;
   oSdc.Name="XYZX";
    oSdc.Description="XYZX";
  categoryList.Add( oSdc);
protected bool CheckRequiredCategory()
    {
        if (oSDc.oSdc.ParentCategoryID< 1)
        {
            return false;
        }
        else
        {
            return true;
        }


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