Type UserControl does not have a public property named Columns

Question

I'm trying to develop a

UserControl

containing a

GridView

inside a

Panel

<asp:Panel runat="server" ID="panel"> 

    <asp:GridView ID="gridView" runat="server" AutoGenerateColumns="false">

    </asp:GridView>

</asp:Panel>

Code behind

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);

            }

        }

    }

}

I've included the control into a ASPX page, using the

Columns

public property

<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>

But I get the following error in Design section:

Type 'System.Web.UI.UserControl' does not have a public property named 'Columns'

I've tried to implement this solution, but it doesn't work. Any ideas?

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Answer 1

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; }
}

Type UserControl does not have a public property named Columns

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