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XLSX and DOCX Format

This help article describes the specifics of exporting a RadTreeList control to XLSX and DOCX format, introduced by Microsoft in Office 2007. Both formats are supported since Q3 2014 and are based on the Telerik document processing libraries. In order to use xlsx export formats, you have to set the ExportSettings-Excel-Format property to Xlsx, while docx format does notrequire applying a property.

    <Excel Format="Xlsx" />


When you set DataFormatString of RadTreeList columns, the format will be applied to the exported file.Note that only the custom numeric format strings (Example 1)will work because in most scenarios they match the Microsoft Excel’s custom numeric format. The built-in .NET standard numeric format strings (Example 2) can still beused, but the output will not be as expected. It is important to note, that the exported file is based on the actual RadTreeList cells values. When DataFormatString is applied, these values will already be formatted which could be prevented by setting the SuppressColumnDataFormatStrings property to true.

Example 1:

<telerik:TreeListBoundColumn DataType="System.DateTime" DataField="DateField" DataFormatString="{0:tt dd-MM(yyyy) }" />

Example 2:

<telerik:TreeListBoundColumn DataType="System.Double" DataField="DoubleField" DataFormatString="{0:C2}" />

Hiding Columns / Rows

Hiding rows and columns is pretty straightforward. Actually you can hide these elements in the same way you hide them in a normal server-side scenario.

RadTreeList1.GetColumn("ID").Visible = false;
RadTreeList1.Items[0].Visible = false;
RadTreeList1.GetColumn("ID").Visible = false
RadTreeList1.Items(0).Visible = false

Styling Columns / Rows / Cells

In order to style the elements of the RadTreeList you could use the standard ASP.NET style properties such as ItemStyle,AlternatingItemStyle, HeaderStyle and FooterStyle to provide a custom style for the items of RadTreeList control.

<AlternatingItemStyle BorderColor="Red" BorderStyle="Solid" BorderWidth="1px" />
<ItemStyle ForeColor="Green" />
<HeaderStyle BackColor="Yellow" />

Another approach is to hook OnInfrastructureExporting event handler and apply the styles in code behind. Note that styling via CSS classes is not possible.

xls.Column col = e.ExportStructure.Tables[0].Columns[2];
col.Style.BackColor = Color.Gray;
col.Style.ForeColor = Color.Yellow;
Dim col As xls.Column = e.ExportStructure.Tables(0).Columns(2)
col.Style.BackColor = Color.Gray
col.Style.ForeColor = Color.Yellow
xls.Row row = e.ExportStructure.Tables[0].Rows[2];
row.Style.BackColor = Color.Blue;
Dim row As xls.Row = e.ExportStructure.Tables(0).Rows(2)
row.Style.BackColor = Color.Blue
xls.Cell cell1 = e.ExportStructure.Tables[0].Cells["B2"];
cell1.Style.BackColor = Color.Yellow;
Dim cell1 As xls.Cell = e.ExportStructure.Tables(0).Cells("B2")
cell1.Style.BackColor = Color.Yellow
xls.Cell cell2 = e.ExportStructure.Tables[0].Cells[3, 3];
cell2.Style.ForeColor = Color.Tomato;
Dim cell2 As xls.Cell = e.ExportStructure.Tables(0).Cells(3, 3)
cell2.Style.ForeColor = Color.Tomato

Image Support

Both xlsx and docx support exporting of images. The images are included automatically in theexported document and you do not have to set any specific property. Keep in mind images with an absolute or relative path are supported, but binary images are not.


  • No grouping support

  • No automatic column/row resizing

See Also

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