Named format placeholders in ReSharper annotations?

Question

ReSharper has the fantastic StringFormatMethodAttribute annotation which provides code analysis for format strings and their parameters. It can be added to any custom string format methods like this:

[StringFormatMethod("format")]
void DebugFormat(string format, params object[] args);

This works well when using integer placeholders, eg:

x.DebugFormat("ReSharper is {0} for {1} placeholders", "great", "numbered");

However, some libraries (like Serilog and ASP.Net Core / Microsoft.Extensions.Logging ) offer named format placeholders which are used for (semantic | structured) logging and this seems to be something that ReSharper does not (yet) offer. For example, a line of code like this:

x.DebugFormat("ReSharper is {Quality} for {Style} placeholders", "poor?", "named");

Results in the ReSharper code analysis warning

Format item index must be a number starting 0 without leading or trailing whitespaces

Searching on ReSharper support, this site, and Google draws a blank. Has anyone found a way to get string format annotations working with named placeholders?

Relevant JetBrains links:

• ReSharper help on StringFormatMethodAttribute
• ReSharper help on custom string formatting methods

Answer 1

I have implemented an R# extension for this. Download it here from JetBrains.

It is also hosted on GitHub .

This extension highlights structured logging templates and contains some useful analyzers. Here is how the structured logging events look with the plugin installed: