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 # Class CommonAPI

 Last update: 09.03.2026 

<a id="VM_API_Pre_GearTrain_CommonAPI"></a>

Namespace: [VM.API.Pre.GearTrain](VM.API.Pre.GearTrain.md)  
Assembly: VM.API.Pre.GearTrain.dll

This class implements common APIs class.

```csharp
public static class CommonAPI

```

#### Inheritance

object ← [CommonAPI](VM.API.Pre.GearTrain.CommonAPI.md)

#### Extension Methods

[LinkPropertyItemCache.GetLinkProperties(object, LinkPropertyType)](VM.Models.Pre.Cache.LinkPropertyItemCache.md#VM_Models_Pre_Cache_LinkPropertyItemCache_GetLinkProperties_System_Object_VM_Models_Pre_LinkPropertyType_), [LinkPropertyItemCache.GetLinkPropertiesAndValues(object, LinkPropertyType)](VM.Models.Pre.Cache.LinkPropertyItemCache.md#VM_Models_Pre_Cache_LinkPropertyItemCache_GetLinkPropertiesAndValues_System_Object_VM_Models_Pre_LinkPropertyType_), [LinkPropertyItemCache.GetLinkedObjects&lt;T&gt;(object, LinkPropertyType)](VM.Models.Pre.Cache.LinkPropertyItemCache.md#VM_Models_Pre_Cache_LinkPropertyItemCache_GetLinkedObjects__1_System_Object_VM_Models_Pre_LinkPropertyType_)

## Methods

### <a id="VM_API_Pre_GearTrain_CommonAPI_OpenHiddenDocument_VM_Managed_DAFUL_GearTrain_IOpenDesignerForGearTrain_"></a> OpenHiddenDocument(IOpenDesignerForGearTrain)

Open designer.

```csharp
[NotNull(new string[] { "entity" })]
public static Document3D OpenHiddenDocument(this IOpenDesignerForGearTrain entity)

```

#### Parameters

`entity` IOpenDesignerForGearTrain

The entity to be opened.

#### Returns

Document3D

The opened document .

#### Exceptions

ArgumentNullException

Will be thrown if 'entity' argument is empty.

### <a id="VM_API_Pre_GearTrain_CommonAPI_OpenHiddenDocument_VM_API_Pre_Obj_"></a> OpenHiddenDocument(Obj)

Open designer.

```csharp
[NotNull(new string[] { "entity" })]
public static Document3D OpenHiddenDocument(this Obj entity)

```

#### Parameters

`entity` [Obj](https://github.com/AnsysVirtualMotion/DAFUL/blob/9110677a5f6a53d7604f8dfd35b4c5fceb59e8e0/DAFUL/ClassicPre/API/VM.API.Pre/Models/Obj.cs)

The entity to be opened.

#### Returns

Document3D

The opened document .

#### Exceptions

ArgumentNullException

Will be thrown if 'entity' argument is empty.