I thought that the problem I am encountering was due to the unbound RadMultiColumnComboBox.
I am using the RadMultiColumnComboBox just like the way the unbound RadMultiColumnComboBox was use in this sample.
The only difference of the solution is that the control was added to the form onruntime.
Instead of showing the value the display member has, it shows
Telerik.WinControls.UI.GridViewDataRowInfo .
Also, I get a runtime error if I clicked on the dropdown grid. But no error if I used the arrow keys to select a record.
I made a test project with this scenario. The Form is blank at startup.
Does this mean that we cannot add controls on runtime?
Below is the code.
private void Form1_Load(object sender, EventArgs e)
{
var comboBox = new RadMultiColumnComboBox();
this.Controls.Add(comboBox);
comboBox.EditorControl.ShowColumnHeaders = false;
comboBox.DropDownStyle = RadDropDownStyle.DropDownList;
comboBox.Font = new System.Drawing.Font("Verdana", 9F,
System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
comboBox.EditorControl.ShowHeaderCellButtons = false;
comboBox.EditorControl.ShowRowHeaderColumn = false;
comboBox.EditorControl.AutoSizeColumnsMode = GridViewAutoSizeColumnsMode.Fill;
comboBox.Size = new Size(500, 20);
var source = SampleData();
foreach (DataColumn dataColumn in source.Columns)
comboBox.EditorControl.Columns.Add(dataColumn.ColumnName, dataColumn.ColumnName);
foreach (DataRow dataRow in source.Rows)
comboBox.EditorControl.Rows.Add(dataRow.ItemArray);
if (comboBox.Columns.Contains("Value"))
{
comboBox.Columns["Value"].IsVisible = false;
comboBox.DisplayMember = "Value";
comboBox.ValueMember = "Value";
}
}
DataTable SampleData()
{
var dt = new DataTable();
dt.Columns.Add("Name");
dt.Columns.Add("Description");
dt.Columns.Add("Value");
dt.Rows.Add(new object[] { "1", "Low", "1 - Low" });
dt.Rows.Add(new object[] { "2", "Medium", "2 - Medium" });
dt.Rows.Add(new object[] { "3", "High", "3 - High" });
return dt;
}