sorted list question

crash893

Hi all I'm totaling up a list of items in a Binding source and I am just having a small problem with syntax for incrementing the value of a key if it already exists any help is greatly appreciated line 16 below [code]SortedList mySortedList = new SortedList(); foreach (DataRowView view in myBindingSource) { if ((string)view["group_name"] == "USAT-Desktop") { view["group_name"] = "TEST TEST"; } if (mySortedList.Contains(view["category_name"])== false) { mySortedList.Add(view["category_name"], 1); } else { //how do I ++ the value of the key if it already exists? //mysortedlist[view["category_name"]].value +=1? }[/code]

Luc Pattyn

Hi,

mysortedlist[view["category_name"]] = 1+(int)mysortedlist[view["category_name"]];

should do it. BTW: the above code line was set inside <pre> </pre> tags; they work much better than [code] [/code] !

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crash893

I'll give it a try sorry about the tags I always forget going from form to form this one is a little different

crash893

that works great I just tried it thanks so much I was close but I don't think I would have gotten that for a while

Luc Pattyn

you're welcome.

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crash893

Someone else suggested this solution

private SortedList getTotals(BindingSource BS, string column)
{
SortedList list = new SortedList();
string name;

        foreach (DataRowView row in BS)
        {
            name = (string)row\[column\];

            if (list.ContainsKey(name))
            {
                list\[name\]++;
            }
            else
            {
                list.Add(name, 1);
            }
        }
        return list;
    }

Side thought is there an easy way to "strip" the key values into an array that i could feed a combobox?

Luc Pattyn

Hi, if you have .NET 2.0 or better, you can use generics such as SortedList<string,int> and that should allow you to do list[name]++; so it gives you the same base idea, a more readable source, and it eliminates the need to cast to int, so it does save some CPU cycles. I trust that is what you meant, but if so the HTML eater has swallowed it. list.Keys is the collection that holds all the key values, I guess you could feed it directly into a ComboBox through its DataSource property. If you need to know more, please read up on it either on your local MSDN that came with Visual Studio, or on http://msdn2.microsoft.com[^] :)

Luc Pattyn [Forum Guidelines] [My Articles]

this weeks tips: - make Visual display line numbers: Tools/Options/TextEditor/... - show exceptions with ToString() to see all information - before you ask a question here, search CodeProject, then Google