Export Custom Headers

[jfkrueger]

Hello,

I have had to use custom headers for a few columns in order to implement wrapping:

<telerik:GridViewDataColumn DataMemberBinding="{Binding QualityOpportunities}" Width="125" TextWrapping="Wrap" >
    <telerik:GridViewDataColumn.Header>
        <Grid>
            <TextBlock Text="Number of Quality Opportunities" TextWrapping="Wrap" HorizontalAlignment="center"/>
        </Grid>
    </telerik:GridViewDataColumn.Header>
</telerik:GridViewDataColumn>

However when I export the grid the column header turns into "System.Windows.Controls.Grid" instead of using the text of the text block. How can I get the column header to export correctly?

Thank you!

[Dimitrina]

Hi Jfkrueger,

 You may take a look at this forum thread on the same topic. There is a sample application, which you may download and review.

Please let me know in case you have any further questions.

Regards,
Didie
the Telerik team

[jfkrueger]

Thank you!

I'm not sure if this is how that other thread handles it but this is what worked for me (please let me know if this is a horrible hack or if I am doing it correctly):

    

Private Sub RadGridViewEvidenceBasedMedicine_ElementExporting(ByVal sender As Object, ByVal e As Telerik.Windows.Controls.GridViewElementExportingEventArgs) Handles RadGridViewEvidenceBasedMedicine.ElementExporting

    If e.Context Is Nothing OrElse
        e.Context.ToString.Trim <> "Telerik.Windows.Controls.GridViewDataColumn" OrElse
        e.Value Is Nothing

        Return

    End If

    If  e.Context.datamemberbinding.path.path = "QualityOpportunities" and e.Value.ToString.Trim = "System.Windows.Controls.Grid"

        e.Value = "Number Of Quality Opportunities"

    ElseIf e.Context.datamemberbinding.path.path = "QualityOpportunitiesWithCompliance" and e.Value.ToString.Trim = "System.Windows.Controls.Grid"

        e.Value = "With Compliance"

    ElseIf e.Context.datamemberbinding.path.path = "ComplianceRate" and e.Value.ToString.Trim = "System.Windows.Controls.Grid"

        e.Value = "Compliance Rate"

    End If

End Sub

[Dimitrina]

Hello Jfkrueger,

 This is fine, the only problem is that the value is hard-coded.

In the forum the export is done almost the same way except for the value used. There it is explained that you need just to set the Text of the e.Value in the ElementExporting event like so:

            if (e.Value != null && e.Value.GetType() == typeof(TextBlock))
                e.Value = (e.Value as TextBlock).Text;

It is up to you what you prefer.

Best wishes,
Didie
the Telerik team

[jfkrueger]

Your suggestion is definitely more efficient and I would prefer to use that however it does not work...

For vb.net I believe the conversion would be:

If e.Value IsNot Nothing AndAlso e.Value.GetType() Is GetType(TextBlock) Then
    e.Value = TryCast(e.Value, TextBlock).Text
End If

The problem is that for the columns where the type is displayed as the header instead of the header text  in the text block the Type is being returned as {System.Windows.Controls.Grid} and not TextBlock.

Once again, here is the column in question:

<telerik:GridViewDataColumn DataMemberBinding="{Binding QualityOpportunities}" Width="125" TextWrapping="Wrap" >
    <telerik:GridViewDataColumn.Header>
        <Grid>
            <TextBlock Text="Number of Quality Opportunities" TextWrapping="Wrap" HorizontalAlignment="center"/>
        </Grid>
    </telerik:GridViewDataColumn.Header>
</telerik:GridViewDataColumn>

The header text that gets displayed is: "System.Windows.Controls.Grid".

Thanks again!        

[jfkrueger]

Just had to remove the <grid> tags from within my header tags:

<telerik:GridViewDataColumn DataMemberBinding="{Binding QualityOpportunities}" Width="125" TextWrapping="Wrap" >
    <telerik:GridViewDataColumn.Header>
            <TextBlock Text="Number of Quality Opportunities" TextWrapping="Wrap" HorizontalAlignment="center"/>     </telerik:GridViewDataColumn.Header>
</telerik:GridViewDataColumn>

Not sure why I had them there in the first place, must have copied from another example. Now it works perfectly with your code. Thank you!