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common-null-value-parameter-format.md

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title description type page_title slug position tags ticketid res_type
Value cannot be null. (Parameter 'format')
Fix error Value cannot be null. (Parameter 'format') when using Telerik UI for Blazor.
troubleshooting
Value cannot be null. (Parameter 'format')
common-kb-null-value-parameter-format
telerik, blazor, null, value, parameter, format, localization
1528567, 1570325
kb

Environment

Product UI for Blazor

Description

I am getting an error when I am using a Telerik Blazor component in an application with enabled localization.

Error Message

The exact error message can vary. Here are just a few examples:

Unhandled exception rendering component: Value cannot be null. (Parameter 'format')

System.ArgumentNullException: Value cannot be null. (Parameter 'format')
    at System.String.FormatHelper(IFormatProvider provider, String format, ParamsArray args)
    at System.String.Format(String format, Object arg0, Object arg1)
    at Telerik.Blazor.Components.TelerikWizard.get_PagerMessage()

System.ArgumentNullException: Value cannot be null. (Parameter 'format')
    at System.String.FormatHelper(IFormatProvider provider, String format, ParamsArray args)
    at Telerik.Blazor.Components.Common.Filters.FilterMenu.TelerikFilterMenu.get_FilterMenuSettingsLabel()

Possible Cause

A similar error can occur if a component is used in a localized application, but the .resx files are missing some keys for the corresponding component.

The app either needs to implement localization for the Telerik components correctly, or not implement a localization service at all. Partial localization is not possible. So, it is essential that the .resx files for the Telerik components are always up-to-date and contain all the necessary keys.

Solution

To solve the issue, make sure that:

  • The [application is correctly configured to use localization]({%slug globalization-localization%})
  • The resx files are up-to-date and contain all required localization strings

Find the latest localization files in two places:

  • (maintained by Telerik) In the offline version of our Blazor demo site. Download our [UI for Blazor automated installer]({%slug installation/msi%}) or [UI for Blazor ZIP archive]({%slug installation/zip%}). Then, look inside folder /demos/TelerikBlazorDemos/Resources/.
  • (maintained by the community) In the telerik/blazor-ui-messages GitHub repository

In some cases, you might not get an error, but components may appear partially localized (some texts are missing). More details on that are available at [Partially Localized Components, Missing Text, Not Translated Text]({%slug common-kb-partial-localization%}).

See Also

  • [Telerik Blazor localization]({%slug globalization-localization%})