I'm trying to develop a
UserControl
GridView
Panel
<asp:Panel runat="server" ID="panel">
<asp:GridView ID="gridView" runat="server" AutoGenerateColumns="false">
</asp:GridView>
</asp:Panel>
public partial class DropDownMultiColumn : UserControl
{
[System.Web.UI.IDReferenceProperty(typeof(DataControlFieldCollection))]
[PersistenceMode(PersistenceMode.InnerProperty)]
public virtual DataControlFieldCollection Columns
{
get { return gridView.Columns; }
set
{
gridView.Columns.Clear();
foreach (DataControlField c in value)
{
gridView.Columns.Add(c);
}
}
}
}
Columns
<dd:DropDownMultiColumn id="_dd_InsertStore" runat="server" DataSourceID="_dsTest" >
<Columns>
<asp:BoundField DataField="MGCOD" HeaderText="MGCOD"></asp:BoundField>
<asp:BoundField DataField="MGDSC" HeaderText="MGDSC"></asp:BoundField>
</Columns>
</dd:DropDownMultiColumn>
Type 'System.Web.UI.UserControl' does not have a public property named 'Columns'
Here follows a working workaround for the issue.
Declare a property with JSON content
Declare Columns
as an attribute, containing required data in JSON format
<dd:DropDownMultiColumn id="_ddInsertStore" runat="server" DataSourceID="_dsTest" Columns="
[{ 'DataField':'MGCOD', 'HeaderText':'MGCOD' },
{ 'DataField':'MGDSC', 'HeaderText':'MGDSC' }]">
</dd:DropDownMultiColumn>
Convert JSON to BoundField
Within OnLoad
event, deserialize JSON and build BoundField
data
protected override void OnLoad(EventArgs e)
{
List<Column> columns = JsonConvert.DeserializeObject<List<Column>>(Columns);
gridView.Columns.Clear();
foreach (Column column in columns)
{
BoundField boundField = new BoundField();
boundField.DataField = column.DataField;
boundField.HeaderText = (string) column.HeaderText;
gridView.Columns.Add(boundField);
}
}
Declare a Column
class, having the required properties.
public class Column
{
public string DataField { get; set; }
public string HeaderText { get; set; }
}