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An attempt to load a workbook from a file causes the WPF program to freeze

bugSomething isn't workingSomething isn't working

completedA bug was fixed or question answered and the issue will be closed soonA bug was fixed or question answered and the issue will be closed soon

how to?How does a certain function work or how can something be achieved?How does a certain function work or how can something be achieved?

Status: Open.

#84 In rabanti-github/NanoXLSX;

· MOP3E opened on Apr 24, 2026

How to read cell containg date?

how to?How does a certain function work or how can something be achieved?How does a certain function work or how can something be achieved?

Status: Open.

#82 In rabanti-github/NanoXLSX;

· TiliSleepStealer opened on Jan 9, 2026

Open file with lots of data is pretty slow

enhancementNew feature or requestNew feature or request

Status: Open.

#81 In rabanti-github/NanoXLSX;

· allenz8512 opened on Dec 24, 2025

[FeatureRequest]: LoadAsync to take and respect CancellationToken

backlog-v3Planned as feature in Version 3 but not yet startedPlanned as feature in Version 3 but not yet started

enhancementNew feature or requestNew feature or request

Status: Open.

#80 In rabanti-github/NanoXLSX;

· Smurf-IV opened on Oct 1, 2025

[Feature Request]; Please read the definedNames to populate known ranges

backlog-v3Planned as feature in Version 3 but not yet startedPlanned as feature in Version 3 but not yet started

enhancementNew feature or requestNew feature or request

Status: Open.

#79 In rabanti-github/NanoXLSX;

· Smurf-IV opened on Oct 1, 2025

Add Strong name signing

enhancementNew feature or requestNew feature or request

wontfixThis will not be worked onThis will not be worked on

Status: Open.

#47 In rabanti-github/NanoXLSX;

· shalarim opened on Mar 14, 2023

CustomFormatCode - Backslash to escape special format characters

bugSomething isn't workingSomething isn't working

Status: Open.

#42 In rabanti-github/NanoXLSX;

· SebZar opened on Nov 3, 2022

Read large xlsx files

enhancementNew feature or requestNew feature or request

questionFurther information is requestedFurther information is requested

Status: Open.

#38 In rabanti-github/NanoXLSX;

· mla-alm opened on Oct 8, 2022

Image support

enhancementNew feature or requestNew feature or request

Status: Open.

#37 In rabanti-github/NanoXLSX;

· marcel-kehrer opened on Oct 5, 2022

Is it possible to add Data Validations?

backlog-v3Planned as feature in Version 3 but not yet startedPlanned as feature in Version 3 but not yet started

enhancementNew feature or requestNew feature or request

Status: Open.

#35 In rabanti-github/NanoXLSX;

· kchanninggithub opened on Oct 3, 2022

Semicolon in formulas replaced with |

backlog-v3Planned as feature in Version 3 but not yet startedPlanned as feature in Version 3 but not yet started

pendingA solution is pending or long-term work is in progressA solution is pending or long-term work is in progress

Status: Open.

#27 In rabanti-github/NanoXLSX;

· nieejl opened on Jun 8, 2022