So I am adding a UltraComboEditor to a UltraGrid on the fly as the editor control for a cell. I do this in the after row insert event.
When I set the datasource (an UltraDataSource) of the UltraComboEditor I don't see the items on the UI. It looks as though there is no datasource at all. The datasource is fine as it works if I use the UltraCombo control instead.
What extra step do I need to perform with the UltraComboEditor to get it to show the items from the datasource?
This is the relevent code:
/// <summary>
/// Row Inserted
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void RequestGrid_AfterRowInsert(object sender, RowEventArgs e) {
// account mappings only past this point
if(e.Row.Band.Index != 1) {
return;
}
// get the account number
string accountNumber = e.Row.ParentRow.Cells["AccountNumber"].Value.ToString();
// jig up an account
Account A = new Account(accountNumber);
// get instances
ChartDataCache DataCache = ChartDataCache.Instance;
// get rowsets
DataRow[] Rowsets = DataCache.AccountDetailData.Tables["Rowsets"].Select("CompanyNumber = '" + A.CompanyNumber + "'");
// rowset edit control
UltraComboEditor RowsetComboEditor = new UltraComboEditor();
RowsetComboEditor.Name = Guid.NewGuid().ToString();
RowsetComboEditor.Visible = false;
// set datasource
RowsetComboEditor.DisplayMember = "RowsetName";
RowsetComboEditor.ValueMember = "RowsetName";
// bind
BindToRows(RowsetComboEditor, Rowsets, "(Select)", "(Select)", "(None Available)");
// add it to the grid and set it as the edit control
RequestGrid.Controls.Add(RowsetComboEditor);
e.Row.Cells["RowsetName"].EditorControl = RowsetComboEditor;
/// Bind a menu to a list of data rows
/// <param name="Menu"></param>
/// <param name="Rows"></param>
private void BindToRows(UltraComboEditor Menu, DataRow[] Rows, string initialText, string initialValue, string emptyVal) {
try {
// flag an empty set
bool emptySet = Rows.Length == 0;
// anything there?
if(emptySet) {
// create data to represent an empty set
DataTable T = new DataTable("Empty");
T.Columns.Add(Menu.DisplayMember, typeof(string));
T.Columns.Add(Menu.ValueMember, typeof(string));
T.Rows.Add("(None Available)", emptyVal);
Rows = T.Select();
// data source instance
UltraDataSource S = new UltraDataSource();
// add columns
foreach(DataColumn C in Rows[0].Table.Columns) {
S.Rows.Band.Columns.Add(C.ColumnName);
if(!emptySet) {
if(Rows.Length > 1) {
DataRow SelectRow = Rows[0].Table.NewRow();
SelectRow[Menu.DisplayMember] = initialText;
SelectRow[Menu.ValueMember] = initialValue;
S.Rows.Add(SelectRow.ItemArray);
// add data
foreach(DataRow R in Rows) {
S.Rows.Add(R.ItemArray);
// set data source
Menu.DataSource = S;
catch(Exception ex) {
Okay, I see what happened. You are mixing up DataMember with DisplayMember. What you want to do here is set DisplayMember to the DisplayName. And probably ValueMember to the Key (or Value).
Oh, oops. My misunderstanding of what DataMember was trying to do. I thought it specified the property to use as the DisplayText of the object within the array.
So, if I had an array of objects that had the properties: DisplayName, Value and Key. Then DataMember would be set to DisplayName to DataMember to indicate that I wanted the DisplayName property to be bound to the DisplayText property of the ValueListItem.
Sorry.
Hi Phil,
I'm not sure what you are trying to do here. DataMember has no meaning for an Array. DataMember specifies which list to use when you bind to a data source that has multiple lists, such as a DataSet. If you are binding to an Array, then any DataMember you specify will not exist, since there is only one list, and it makes no sense to set this property.
I am setting a DataSource which is an array of System.Data.DataRow objects. When I specify the DataMember, the DataBind method does not bind any data and Items.Count is equal to zero. However, if DataMember is Nothing then the list is bound to all the items in the array. To get around this, the first property of the DataRow object is the DataMember I want to specify. Is this a bug?
I am experiencing the same issue as described in this thread - has this issue been raised, or shall I submit an incident?