Add support for named placeholders in strings

[skillmaker-dev]

Hi, Can you please add support for named placeholders in strings in next versions of C#, here is what I mean by that, sometimes we define a constant string for logging, for example: const string LogMessage = "The entity {entityNumber} is not found"; this works fine when using the logger like this: _logger.LogError(LogMessage,entityNumber),
However, when we want to return a NotFound Result in controllers too, we can't use it directly, we have to use indexed placeholders and even if we use string.Format that won't work with named placeholders.
It would be great to have a supported method like this string.Format(LogMessage, entityNumber) and therefore using the same defined log constant in both places.

Please enlighten me in case I missed another way to do it, thanks in advance.

[TahirAhmadov]

This sounds like an API request, not a language request.

WRT named placeholders, you may want to look for available 3rd party libraries which offer this functionality. https://www.nuget.org/packages/FormatWith comes to mind, among others.

[skillmaker-dev]

Thanks for the reply, I think i need to open the issue in the dotnet repo instead

[CyrusNajmabadi]

@skillmaker-dev I transferred this here for you.

[skillmaker-dev]

@CyrusNajmabadi thanks a lot for the help

[elgonzo]

FYI: Very recently there was a quite similar suggestion: #100259.