For instance, when exporting FLOOR.MATH function a #NAME error is displayed initially.

Workaround: Select the cell in Excel, click in the formula bar and press Enter without changing anything. This fixes the #NAME error and Excel manages to successfully display the function result.

When the default number formats for Accounting and Currency are used and the current culture is Russian, the number format is not parsed correctly.

Add support for CHOOSE function. CHOOSE uses the number parameter to return a value from the list of value arguments. 

A list of the supported functions is available at http://docs.telerik.com/devtools/document-processing/libraries/radspreadprocessing/features/formulas/functions

This function can be implemented as a custom function. Check the following resources for more details on how to achieve that:

- http://docs.telerik.com/devtools/document-processing/libraries/radspreadprocessing/features/formulas/custom-functions
- https://github.com/telerik/xaml-sdk/tree/master/Spreadsheet/CustomFunctions

Available in R2 2017 Official Release.

Add support for TRIM function. TRIM removes all spaces from text except for single spaces between words.

A list of the supported functions is available at http://docs.telerik.com/devtools/document-processing/libraries/radspreadprocessing/features/formulas/functions

This function can be implemented as a custom function. Check the following resources for more details on how to achieve that:

- http://docs.telerik.com/devtools/document-processing/libraries/radspreadprocessing/features/formulas/custom-functions
- https://github.com/telerik/xaml-sdk/tree/master/Spreadsheet/CustomFunctions

Available in R2 2017 Official Release.

This would allow repeating header rows on every printed page. More information related to this functionality may be found on the following link:

https://support.office.com/en-us/article/Print-rows-with-column-headers-on-top-of-every-page-d3550133-f6a1-4c72-ad70-5309a2e8fe8c

If Spreadsheet's history is not enabled, merged cells cannot be unmerged. 

Workaround: Enable the History before calling Unmerge():

workbook.History.IsEnabled = true;
worksheet.Cells[0, 0, 0, 4].Unmerge();
workbook.History.IsEnabled = false;

When importing and exporting xlsx document with email address hyperlink the exported document shows invalid document message when opened in Excel: "We found a problem with some content in 'file.xlsx'. Do you want us to try to recover as much as we can? If you trust the source of thes workbook, click Yes.". The document can be only partially recovered and information is lost.

For example, if a user wants to set a 5x5 array of values in the worksheet he has to iterate through all the values one by one and set it to the worksheet. With that API the user should be able to set the entire array with just one method call giving it the array.

Steps to reproduce: 

1. Enter in a cell =Today()
2. Show Format Cells dialog and set Custom format "d"

Expected: The value is the day of the month.
Actual: The date is formatted as short date but has to be day of the month.

The exception is thrown when importing a document that contains an empty stylesheet tag in its styles.xml part.

Add support for the AVERAGEIF function:  https://support.office.com/en-us/article/AVERAGEIF-function-faec8e2e-0dec-4308-af69-f5576d8ac642

Returns the average (arithmetic mean) of all the cells in a range that meet a given criteria:

AVERAGEIF(range, criteria, [average_range])


Workaround: This could be implemented as a custom function: http://docs.telerik.com/devtools/document-processing/libraries/radspreadprocessing/features/formulas/custom-functions.html

Add API for registering custom image decoders, e.g. for .emf and .wmf images.

In some cases when cells are merged the cell borders are not correctly imported.

When the Workbook has more than one sheet a localSheetId should be exported: 

<definedName name="xlnm.Print_Titles" localSheetId="0">Sheet1!$A$1</definedName>

localSheetId (from the OOXML specification): Specifies a boolean value that indicates whether the defined name is related to an external function, command, or other executable code.