CODEWITHSUNDEEP
c#wpfvisual-studio-2010
iJay
iJay

Reputation: 4293

WPF Listbox SelectedItems

how can I get the selected item's value of a list box?

I tried something like this:

            foreach (var item in combo_course_op.SelectedItems)
            {
                string s = "select cid from tms_course where course_title = '" + item.ToString() + "'";
            }

but it doesnt works..it shows string s as "select cid from tms_course where course_title ='System.Data.DataRowView'"

where am I doing wrong?

This is how I data binded:

MyCommand = new OdbcCommand("select distinct module_name from tms_class_schedule where class_date ='"+selectedDate+"'", DBConnect.MyConnection);
            dap = new OdbcDataAdapter(MyCommand);
            DS = new DataSet();
            dap.SelectCommand = MyCommand;
            dap.Fill(DS);
            combo_course_op.DataContext = DS.Tables[0].DefaultView;
            combo_course_op.DisplayMemberPath = DS.Tables[0].Columns["module_name"].ToString();

Upvotes: 1

Views: 4529

Answers (4)

ZanderAdam
ZanderAdam

Reputation: 434

In your code the DisplayMemberPath is set to Columns["module_name"]

Inferring from this, following should work:

foreach (var item in combo_course_op.SelectedItems)
{
   string s = "select cid from tms_course where course_title = '" + item["module_name"].ToString() + "'";
}

Selected items are DataRow, therefore you have to get the right column for the value to be returned.

Upvotes: 1

Tilak
Tilak

Reputation: 30728

foreach (var item in combo_course_op.SelectedItems)
{
    string s = "select cid from tms_course where course_title = '" 
             + (item["Title"] as string) + "'"; // if Title is column name. Otherwise replace "Title" with actual column header name
}

Upvotes: 1

Thorsten Dittmar
Thorsten Dittmar

Reputation: 56727

Obviously your list box is bound to some data source. That means that the items in the list box are not strings, but instances of DataRowView. You can cast and get the underlying data object like that:

DataRowView drv = (DataRowView)item;
<TheRealType> itemOfMyType = (<TheRealType>)drv.Row;

where <TheRealType> is the actual data type of the item being bound to the list box.

Upvotes: 2

Nicolas Repiquet
Nicolas Repiquet

Reputation: 9265

You can cast Item in its real type :

        foreach (var item in combo_course_op.SelectedItems)
        {
            string s = "select cid from tms_course where course_title = '" +
               ((Course)item).Title + "'";
        }

Or override Course.ToString so it return its title.

EDIT (after noticed about DataRowView)

Putting DataRowViews in a WPF ComboBox looks like a really bad id. Maybe you should read a tutorial or two about WPF and MVVM.

Upvotes: -1

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