======Метод GroundCollection.IndexOf(GroundReference)======
  * **Пространство имен:** [[developers:references:topomatic.glg.references|Topomatic.Glg.References]]
  * **Сборка:** Topomatic.Glg (в Topomatic.Glg.dll)
=====Синтаксис=====
<code csharp>public override int IndexOf(GroundReference item)</code>
**Параметры**
  * //item//
    * Тип: [[developers:references:topomatic.glg.references.groundreference|Topomatic.Glg.References.GroundReference]]

**Возвращаемое значение**
  * Тип: System.Int32