======Метод SurveyItemCollection<Observation>.IndexOf(Observation)======
  * **Пространство имен:** [[developers:references:topomatic.srv.systemclasses|Topomatic.Srv.SystemClasses]]
  * **Сборка:** Topomatic.Srv (в Topomatic.Srv.dll)
=====Синтаксис=====
<code csharp>public override int IndexOf(Observation item)</code>
**Параметры**
  * //item//
    * Тип: [[developers:references:topomatic.srv.compilationsurvey.observation|Topomatic.Srv.CompilationSurvey.Observation]]

**Возвращаемое значение**
  * Тип: [[developers:references:system.int32|System.Int32]]