Add Tag to Column

[Georgios]

Hello,
I work with radGridView in unbound mode and every time I add a column I want to add a Tag to it, indicating the object that the column derives from. However, there is no such property as Tag for columns. Is there a possible way to achieve this, like binding a property or something like this? I tried to add the object's key in gridView.Columns[index].Name property, but this has as a result the uniqueness of the columns. Please help.

Thank you in advance
George K.

[Richard Slade]

Hi,

I'm unsure as to how you intend to use this tag, but if you just want somewhere to store a value, and if you don't have any NULL values in your data, you could use the Null Value property of the column
E.g -

Me.RadGridView.Columns(0).NullValue = "Namespace.Class"

is this the sort of thing you mean?
Richard

[Richard Slade]

Or, you could put a tag on the cell itself

Private Sub RadGridView1_CellFormatting(ByVal sender As System.Object, ByVal e As Telerik.WinControls.UI.CellFormattingEventArgs) Handles RadGridView1.CellFormatting
    If e.CellElement.ColumnInfo.HeaderText = "SOME HEADER" Then
        e.CellElement.Tag = "My Tag"
    End If
End Sub

Best regards,
Richard

[Georgios]

Yes Richard, this is exactly the sort of thing I mean, but I do have null values and as a result NullValues property is not suitable. The point is that the cells have their own tag in which their own id is stored and as a result I cant' use it for the columns.

[Richard Slade]

and the second suggestion?

EDIT: Oops, just re-read your post

[Richard Slade]

However, the tag value accepts object so it could be anything. You can store arrays or list of values in it if you want

Private Sub RadGridView1_CellFormatting(ByVal sender As System.Object, ByVal e As Telerik.WinControls.UI.CellFormattingEventArgs) Handles RadGridView1.CellFormatting
    If e.CellElement.ColumnInfo.HeaderText = "SOME HEADER" Then
        Dim tagvalues As New System.Collections.Generic.List(Of String)
        tagValues.Add("Column Tag")
        tagValues.Add("Cell Tag")
        e.CellElement.Tag = tagvalues
    End If
End Sub

Richard

[Emanuel Varga]

Hello guys,

Georgios, sadly currently the Column does not have a tag property, but if i may, i would suggest creating a Dictionary<int, Type> with the column index as the key and the type, and add that to the main grid's Tag, you will always know the grid it came from, and the column index, so it would be very easy to use and understand.

At least in my point of view.

Hope this helps, if you have any other questions or comments, please let me know,

Best Regards,
Emanuel Varga

[Georgios]

I believe the creation of a dictionary is the best approach for now. Thank you both for your time.

Regards,
George

[Emanuel Varga]

Hello Georgios,

Glad to be able to help, if you have any more questions please just let me know, and if the question has been solved, please mark the question as answered, so that others can find the answers to their questions faster.

Best Regards,
Emanuel Varga

[Svett]

Hi Georgios,

There is another way to add the Tag property for your column. You can use the advanced features of the property system in Telerik Presentation Framework.

You can define a RadProperty that you can attach to the specified column:

public class ColumnProperties
{
    public static readonly RadProperty TagProperty =
        RadProperty.Register("Tag", typeof(object), typeof(GridViewDataColumn), new RadPropertyMetadata(null));
}

Then you can use it simply by using the GetValue and SetValue methods of the column:

this.radGridView1.Columns[0].SetValue(ColumnProperties.TagProperty, "Telerik");
string value = this.radGridView1.Columns[0].GetValue(ColumnProperties.TagProperty) as string;

I hope this helps.

Greetings,
Svett
the Telerik team