You must override Clone() method for derived grid column

[Ketaki]

Hii

 I am doing google like filtering in two level hierarchy. On first level I do not want filtering. In Second level I want filtering. When I create gridcolumn on page load  and that column in gridtableview & add that girdtableview in mastertable then it shows me error such as "You must override Clone() method for derived grid colimn. Please help me.


Thanks in advance.

Regards,
Ketaki

[Vlad]

Hi Ketaki,

Please check this article for more info:
http://www.telerik.com/help/aspnet-ajax/grdinheritgridcolumns.html

Regards,
Vlad
the Telerik team

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[Ketaki]

Hi Vlad,

Actually in Design page I am creating mastertable. But in codeing I am writing below code

protected

 

void Page_Load(object sender, EventArgs e)

 

{

 

if (!IsPostBack)

 

{

DataTable

 

dt = GeXYZTable();

 

 

GridTableView gridxyz = new GridTableView(RadGrid1);

 

gridxyz.AllowFilteringByColumn =

true;

 

 

foreach (DataColumn dataColumn in dt.Columns)

 

{

gridxyz.Columns.Clear();

 

if (dataColumn.ColumnName != "Edit" && dataColumn.ColumnName != "Details" && dataColumn.ColumnName != "Status")

 

{

 

//GridBoundColumn gridColumn = new GridBoundColumn ();

 

 

MyCustomFilteringColumnCS gridColumn = new MyCustomFilteringColumnCS();

 

gridxyz.Columns.Add(gridColumn);

gridColumn.DataField = dataColumn.ColumnName;

gridColumn.HeaderText = dataColumn.ColumnName;

gridColumn.ShowSortIcon =

false;

 

}

}

gridxyz.Rebind();

 

 

this.RadGrid1.MasterTableView.DetailTables.Add(gridxyz);
}
}

But it give me error as You must override Clone() method for derived grid column.

 

[Georgi Krustev]

Hello Ketaki,

When inheriting grid columns in hierarchy, you need to override their Clone() method and copy the base properties as follows:

public override GridColumn Clone()
{
            RequiredGridBoundColumn requiredGridBoundColumn = new RequiredGridBoundColumn();

            //you should override CopyBaseProperties if you have some column specific properties
            requiredGridBoundColumn.CopyBaseProperties(this);

            return requiredGridBoundColumn;
}

For further information you can review this online help article (bottom of the page).

Regards, Georgi Krustev
the Telerik team

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[Ahmad]

Hi

I know it's been years since this thread has been active, but I've been wondering if it's possible to get a little help in "you should override CopyBaseProperties if you have some column specific properties" part. Would you please provide a sample, I would be really grateful.

Thanks in advance

[Tsvetomir]

Hi Ahmad,

This info is mentioned here:
https://docs.telerik.com/devtools/aspnet-ajax/controls/grid/inheritance/inheriting-grid-columns

Essentially, if you would like to create a custom grid column, please check the third solution provided in the following post: Custom Grid Column. Additionally, you can also have a look at this article:
https://docs.telerik.com/devtools/aspnet-ajax/controls/grid/functionality/filtering/google-like-filtering

Hope this helps.

Kind regards,
Tsvetomir
Progress Telerik