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 # Class GroupAPI

 Last update: 16.07.2025 

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

This class implements APIs for Group.

```csharp
public static class GroupAPI

```

#### Inheritance

[object](https://learn.microsoft.com/dotnet/api/system.object) ← [GroupAPI](VM.API.Pre.GroupAPI.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<T>(object, LinkPropertyType)](VM.Models.Pre.Cache.LinkPropertyItemCache.md#VM_Models_Pre_Cache_LinkPropertyItemCache_GetLinkedObjects__1_System_Object_VM_Models_Pre_LinkPropertyType_)

## Methods

### ApplyGroup(Obj, IEnumerable<Obj>)

Apply a  update.

```csharp
[NotNull(new string[] { "group" })]
public static void ApplyGroup(this Obj group, IEnumerable<Obj> objs)

```

#### Parameters

`group` [Obj](VM.API.Pre.Obj.md)

The target  to apply update.

`objs` [IEnumerable](https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1)&lt;[Obj](VM.API.Pre.Obj.md)&gt;

The collection of objects.

#### Exceptions

[ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception)

Will be thrown if 'group' is null.

[ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception)

Will be thrown if the type of 'group' is not .

### CreateGroup(SubSystemDocument, IEnumerable&lt;Obj&gt;)

Create

```csharp
[NotNull(new string[] { "subSystemDocument", "objs" })]
public static Obj CreateGroup(this SubSystemDocument subSystemDocument, IEnumerable<Obj> objs)

```

#### Parameters

`subSystemDocument` SubSystemDocument

The  to create a group.

`objs` [IEnumerable](https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1)&lt;[Obj](VM.API.Pre.Obj.md)&gt;

The bodies of a group.

#### Returns

[Obj](VM.API.Pre.Obj.md)

The new  object that is created by this API.

#### Exceptions

[ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception)

Will be thrown if 'subSystemDocument', 'objs' is null.

[ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception)

Will be thrown if the type of 'objs' is not .