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c# winform get all rows from one column into dictionary and bind to list?

Posted on 2011-03-25
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Last Modified: 2013-12-17
hi all my code below should hopefully explain where im trying to get to if someone could point out the errors and put me in the right direction?

i want all the rows from the column Trades in the Trades Table and get them in a dictionary and bind them

Thanks
Dictionary<string, string> dictATrades = new Dictionary<string, string>();
            foreach (DataRow trade in dataSetMisc.Trades.Rows)
            {
                dictATrades.Add((string)(trade["Trades"]), (string)(trade["Trades"]));
            }
            var dictATradesSort = (from entry in dictATrades orderby entry.Value ascending select entry);

            lstAvailbleTrades.DataSource = new BindingSource(dictATradesSort, null);
            lstAvailbleTrades.DisplayMember = "Value";
            lstAvailbleTrades.ValueMember = "key";

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Question by:awilderbeast
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4 Comments
 
LVL 4

Accepted Solution

by:
RGBDart earned 250 total points
ID: 35216485
I'm not sure why you need dictionary?
Use list instead.

Replace
this code

Dictionary<string, string> dictATrades = new Dictionary<string, string>();
            foreach (DataRow trade in dataSetMisc.Trades.Rows)
            {
                dictATrades.Add((string)(trade["Trades"]), (string)(trade["Trades"]));
            }
            var dictATradesSort = (from entry in dictATrades orderby entry.Value ascending select entry);

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with this one

List<string> dictATrades = (from DataRow trade in dataSetMisc.Trades.Rows select (string)(trade["Trades"])).ToList();
 dictATrades.Sort();

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LVL 63

Assisted Solution

by:Fernando Soto
Fernando Soto earned 250 total points
ID: 35217594
Hi awilderbeast;

I also do not know why you need a Dictionary in this case. I tested your code out and it seems to work fine. Are you receiving errors?

If you are open to another way of doing this using a Dictionary Linq does a nice job.

Dictionary<string, string> dictATrades = ( from t in dataSetMisc.Trades.AsEnumerable( )
                                           orderby t.Field<String>( "Trades" )
                                           select new
                                           {
                                               Key = t.Field<String>( "Trades" ),
                                               Value = t.Field<String>( "Trades" )
                                           } ).ToDictionary( K => K.Key, V => V.Value );

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Fernando
0
 
LVL 2

Expert Comment

by:ericpeckham
ID: 35219794
For one thing, you're putting the same value in both the key and value properties of each dictionary element.  Could that be why it's not working for you?
0
 
LVL 1

Author Closing Comment

by:awilderbeast
ID: 35231168
thanks
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