C# programming model

Cloud Functions provides two models for programming in C#: one is based on the YcFunction interface, the other, on an independent class with a compatible method. Both models require custom implementations of the interfaces and allow the function to accept one argument and one return value of any type.

The difference between these models is the availability of the invocation context. For example, if you need to work with Yandex Cloud services using the SDK, we recommend opting for YcFunction.

No matter which model you select, the project can be uploaded either as a published csproj project or as *cs files with source code. The second option is suitable for handlers without external dependencies. The class that contains the handler must also meet the following requirements:

1. It must be public.
2. It must have a public no-argument constructor.
   It is provided by default. However, if you created your own constructor with arguments, you should also create a no-argument one.
3. It must not be generic.

No matter which model you select, the handler can be an async method that returns Task or Task<T>. For the independent class option, the async void return type is also available.

In this case, there are two distinct types: byte[] and String. They are used slightly differently from other types. If you use them as the handler argument type, the runtime will not convert the incoming request into JSON and instead will provide it directly to the user-defined handler, unless ?integration=raw is used.