编辑 openapi mustache 模板以在方法签名中包含附加参数

Question

I am trying to add an additional parameter in a mustache template autogenerated from API JSON.

Code: I have added an additional parameter for CancellationToken in the method signature as last parameter.

{{#returnType}}System.Threading.Tasks.Task<{{{returnType}}}>{{/returnType}}{{^returnType}}System.Threading.Tasks.Task{{/returnType}} {{operationId}}Async ({{#allParams}}{{{dataType}}} {{paramName}}{{^required}}{{#optionalMethodArgument}} = default({{{dataType}}}){{/optionalMethodArgument}}{{/required}}{{#hasMore}}, {{/hasMore}}{{/allParams}}, CancellationToken cancellationToken = default(CancellationToken));

Problem: This modification works fine and we can generate proper C# scripts, but we have a problem in methods that don't have any inbuilt parameter. Those methods end up being like:

DoThis(, CancellationToken token = default(CancellationToken)).

How do we put a condition for the comma which says - write this comma only when there are one or more inbuilt parameters? Helps appreciated.

Answer 1

It's pretty straightforward in your scenario. Your template adds a comma currently when there are more items left in the list, so if you remove the condition from that comma (because you're always going to be adding another item) you don't need to specifically add one before your CancellationToken.

This has the happy side-effect that if you have no parameters in your list, no commas will be generated (because they're only generated after each parameter)

{{#returnType}}System.Threading.Tasks.Task<{{{returnType}}}>{{/returnType}}{{^returnType}}System.Threading.Tasks.Task{{/returnType}} {{operationId}}Async ({{#allParams}}{{{dataType}}} {{paramName}}{{^required}}{{#optionalMethodArgument}} = default({{{dataType}}}){{/optionalMethodArgument}}{{/required}}, {{/allParams}} CancellationToken cancellationToken = default(CancellationToken));