I'm using .NET 2.0 and I'm trying to bind a combobox's Datasource to a sorted dictionary.
So the error I'm getting is "DataMember property 'Key' cannot be found on the Datasource".
SortedDictionary<string, int> userCache = UserCache.getSortedUserValueCache();
userListComboBox.DataSource = new BindingSource(userCache, "Key"); //This line is causing the error
userListComboBox.DisplayMember = "Key";
userListComboBox.ValueMember = "Value";
This question is related to
c#
.net
winforms
combobox
datasource
Just Try to do like this....
SortedDictionary<string, int> userCache = UserCache.getSortedUserValueCache();
// Add this code
if(userCache != null)
{
userListComboBox.DataSource = new BindingSource(userCache, null); // Key => null
userListComboBox.DisplayMember = "Key";
userListComboBox.ValueMember = "Value";
}
userListComboBox.DataSource = userCache.ToList();
userListComboBox.DisplayMember = "Key";
I know this is a pretty old topic, but I also had a same problem.
My solution:
how we fill the combobox:
foreach (KeyValuePair<int, string> item in listRegion)
{
combo.Items.Add(item.Value);
combo.ValueMember = item.Value.ToString();
combo.DisplayMember = item.Key.ToString();
combo.SelectedIndex = 0;
}
and that's how we get inside:
MessageBox.Show(combo_region.DisplayMember.ToString());
I hope it help someone
I used Sorin Comanescu's solution, but hit a problem when trying to get the selected value. My combobox was a toolstrip combobox. I used the "combobox" property, which exposes a normal combobox.
I had a
Dictionary<Control, string> controls = new Dictionary<Control, string>();
Binding code (Sorin Comanescu's solution - worked like a charm):
controls.Add(pictureBox1, "Image");
controls.Add(dgvText, "Text");
cbFocusedControl.ComboBox.DataSource = new BindingSource(controls, null);
cbFocusedControl.ComboBox.ValueMember = "Key";
cbFocusedControl.ComboBox.DisplayMember = "Value";
The problem was that when I tried to get the selected value, I didn't realize how to retrieve it. After several attempts I got this:
var control = ((KeyValuePair<Control, string>) cbFocusedControl.ComboBox.SelectedItem).Key
Hope it helps someone else!
Use -->
comboBox1.DataSource = colors.ToList();
Unless the dictionary is converted to list, combo-box can't recognize its members.
A dictionary cannot be directly used as a data source, you should do more.
SortedDictionary<string, int> userCache = UserCache.getSortedUserValueCache();
KeyValuePair<string, int> [] ar= new KeyValuePair<string,int>[userCache.Count];
userCache.CopyTo(ar, 0);
comboBox1.DataSource = ar; new BindingSource(ar, "Key"); //This line is causing the error
comboBox1.DisplayMember = "Value";
comboBox1.ValueMember = "Key";
If this doesn't work why not simply do a foreach loop over the dictionary adding all the items to the combobox?
foreach(var item in userCache)
{
userListComboBox.Items.Add(new ListItem(item.Key, item.Value));
}
var colors = new Dictionary < string, string > ();
colors["10"] = "Red";
Binding to Combobox
comboBox1.DataSource = new BindingSource(colors, null);
comboBox1.DisplayMember = "Value";
comboBox1.ValueMember = "Key";
Full Source...Dictionary as a Combobox Datasource
Jeryy
Source: Stackoverflow.com