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 # Class DocumentCategoryAddRemoveEventBase

 Last update: 16.07.2025 

Namespace: [VM.Managed.History](VM.Managed.History.md)  
Assembly: VMAppCore.dll

```csharp
public abstract class DocumentCategoryAddRemoveEventBase : HistoryEvent

```

#### Inheritance

[object](https://learn.microsoft.com/dotnet/api/system.object) ← HistoryEvent ← [DocumentCategoryAddRemoveEventBase](VM.Managed.History.DocumentCategoryAddRemoveEventBase.md)

#### Derived

[DocumentCategoryAddEvent](VM.Managed.History.DocumentCategoryAddEvent.md), [DocumentCategoryRemoveEvent](VM.Managed.History.DocumentCategoryRemoveEvent.md)

#### Inherited Members

HistoryEvent.ClearEvent(bool), HistoryEvent.Undo(HistoryEventArgs), HistoryEvent.Redo(HistoryEventArgs), HistoryEvent.Clear(bool), HistoryEvent.BeforeUndo(HistoryEventArgs), HistoryEvent.AfterUndo(HistoryEventArgs), HistoryEvent.BeforeRedo(HistoryEventArgs), HistoryEvent.AfterRedo(HistoryEventArgs), HistoryEvent.BeforeAdded(AddToHistoryManagerEventArgs), HistoryEvent.AfterAdded(HistoryEventArgs), HistoryEvent.IsValid

#### 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_)

## Constructors

### DocumentCategoryAddRemoveEventBase(Document, ObjectBase, ObjectBase, LinkLinkedList<ObjectBase, Child<ObjectBase, Update>>)

```csharp
protected DocumentCategoryAddRemoveEventBase(Document document, ObjectBase obj, ObjectBase objAfter, LinkLinkedList<ObjectBase, Child<ObjectBase, LinkContainer.Update>> category)

```

#### Parameters

`document` [Document](VM.Managed.Document.md)

`obj` [ObjectBase](VM.Managed.ObjectBase.md)

`objAfter` [ObjectBase](VM.Managed.ObjectBase.md)

`category` [LinkLinkedList](VM.Managed.Collections.LinkLinkedList-2.md)&lt;[ObjectBase](VM.Managed.ObjectBase.md), [Child](VM.Managed.Child-2.md)&lt;[ObjectBase](VM.Managed.ObjectBase.md), [LinkContainer](VM.Managed.LinkContainer.md).[Update](VM.Managed.LinkContainer.Update.md)&gt;&gt;

## Fields

### m\_category

```csharp
protected LinkLinkedList<ObjectBase, Child<ObjectBase, LinkContainer.Update>> m_category

```

#### Field Value

[LinkLinkedList](VM.Managed.Collections.LinkLinkedList-2.md)&lt;[ObjectBase](VM.Managed.ObjectBase.md), [Child](VM.Managed.Child-2.md)&lt;[ObjectBase](VM.Managed.ObjectBase.md), [LinkContainer](VM.Managed.LinkContainer.md).[Update](VM.Managed.LinkContainer.Update.md)&gt;&gt;

### m\_doc

```csharp
protected Document3D m_doc

```

#### Field Value

[Document3D](VM.Managed.Document3D.md)

### m\_objAfterKey

```csharp
protected UIntPtr m_objAfterKey

```

#### Field Value

[UIntPtr](https://learn.microsoft.com/dotnet/api/system.uintptr)

### m\_objKey

```csharp
protected UIntPtr m_objKey

```

#### Field Value

[UIntPtr](https://learn.microsoft.com/dotnet/api/system.uintptr)

## Methods

### AddEventCore(IDocument, HistoryEvent)

```csharp
public static void AddEventCore(IDocument doc, HistoryEvent eventHist)

```

#### Parameters

`doc` IDocument

`eventHist` HistoryEvent

### Clear(bool)

```csharp
protected override void Clear(bool bReserveReferenceCount)

```

#### Parameters

`bReserveReferenceCount` [bool](https://learn.microsoft.com/dotnet/api/system.boolean)

### GetObjectFromKey(UIntPtr)

```csharp
protected ObjectBase GetObjectFromKey(UIntPtr key)

```

#### Parameters

`key` [UIntPtr](https://learn.microsoft.com/dotnet/api/system.uintptr)

#### Returns

[ObjectBase](VM.Managed.ObjectBase.md)

### IsAvailableEvent(IDocument)

```csharp
public static bool IsAvailableEvent(IDocument doc)

```

#### Parameters

`doc` IDocument

#### Returns

[bool](https://learn.microsoft.com/dotnet/api/system.boolean)