ЕвгенийВfkthat Например, Lazy<T> имеет специальный параметр в конструкторе, который как раз позволяет то или иное поведение при неуспешной инициализации выбрать.
Удивительное рядом. Это какой такой параметр?
LazyThreadSafetyMode

- If the mode is LazyThreadSafetyMode.ExecutionAndPublication or LazyThreadSafetyMode.None , there is no second chance to initialize the Lazy<T> instance .
If an exception occurs and is unhandled in the initialization function, that exception is cached and rethrown on subsequent accesses of the Lazy<T>.Value property.
No value is created if an exception is thrown, so in such cases IsValueCreated returns false.

- If the mode is LazyThreadSafetyMode.PublicationOnly , the first thread that succeeds in running the initialization function (or the default constructor) creates the value for the Lazy<T> instance.
If the initialization function throws an exception on one thread, other threads can still try to initialize the Lazy<T> instance .
Until the value is created, the IsValueCreated property returns false.