使用.NET 4.0中的LINQ为组合框设置DisplayMember和ValueMember [英] Setting the DisplayMember and ValueMember for a combobox using LINQ in .NET 4.0

问题描述

我的代码无法在代码中设置组合框的显示值和值成员。我在下面粘贴了我的代码：

My code is not working for setting the display value and value member for a combobox in my code. I have pasted my code below:

private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            // replace the data in the db with new info
            da.Fill(dtUsers);

            var selectQuery =
                from u in dtUsers.AsEnumerable()
                select new { u.UserID, u.FirstName, u.MiddleInitial, u.LastName };

            // save the source
            cboName.ItemsSource = selectQuery;

            foreach (var query in selectQuery)
            {
                cboName.DisplayMemberPath = String.Format("{0} {1} {2}", query.FirstName, query.MiddleInitial, query.LastName);
                cboName.SelectedValuePath = query.UserID.ToString();
            }
        }

推荐答案

Try this:

private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            // replace the data in the db with new info
            da.Fill(dtUsers);

            // save the source
            cboName.ItemsSource = from u in dtUsers.AsEnumerable() select new { u.UserID, FormattedName = String.Format("{0} {1} {2}", query.FirstName, query.MiddleInitial, query.LastName));

            cboName.DisplayMemberPath = "FormattedName";
            cboName.SelectedValuePath = "UserID";
        }

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