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 # Class LinkEventArgs

 Last update: 16.07.2025 

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

This class is to represent the argument of event from linked object.

```csharp
public class LinkEventArgs : EventArgs

```

#### Inheritance

[object](https://learn.microsoft.com/dotnet/api/system.object) ← [EventArgs](https://learn.microsoft.com/dotnet/api/system.eventargs) ← [LinkEventArgs](VM.Managed.LinkEventArgs.md)

#### Derived

[DestroyEventArgs](VM.Managed.DestroyEventArgs.md), [GetRelationInfoEventArgs](VM.Managed.GetRelationInfoEventArgs.md), [NameChangedEventArgs](VM.Managed.NameChangedEventArgs.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_)

## Constructors

### LinkEventArgs(NotifyReason, object, LinkEventArgs, object)

Initializes a new instance of the  class.

```csharp
public LinkEventArgs(NotifyReason reason, object extra, LinkEventArgs innerArgs, object obEventPrevious)

```

#### Parameters

`reason` [NotifyReason](VM.Managed.NotifyReason.md)

The type of event.

`extra` [object](https://learn.microsoft.com/dotnet/api/system.object)

The extra object information.

`innerArgs` [LinkEventArgs](VM.Managed.LinkEventArgs.md)

The inner event.

`obEventPrevious` [object](https://learn.microsoft.com/dotnet/api/system.object)

The previous linked object.

### LinkEventArgs(NotifyReason, object)

Initializes a new instance of the  class.

```csharp
public LinkEventArgs(NotifyReason reason, object extra)

```

#### Parameters

`reason` [NotifyReason](VM.Managed.NotifyReason.md)

The type of event.

`extra` [object](https://learn.microsoft.com/dotnet/api/system.object)

The extra object information.

### LinkEventArgs(NotifyReason, LinkEventArgs, object)

Initializes a new instance of the  class.

```csharp
public LinkEventArgs(NotifyReason reason, LinkEventArgs innerArgs, object obEventPrevious)

```

#### Parameters

`reason` [NotifyReason](VM.Managed.NotifyReason.md)

The type of event.

`innerArgs` [LinkEventArgs](VM.Managed.LinkEventArgs.md)

The inner event.

`obEventPrevious` [object](https://learn.microsoft.com/dotnet/api/system.object)

The previous linked object.

### LinkEventArgs(NotifyReason)

Initializes a new instance of the  class.

```csharp
public LinkEventArgs(NotifyReason reason)

```

#### Parameters

`reason` [NotifyReason](VM.Managed.NotifyReason.md)

The type of event.

## Properties

### EntitiesForCircularReference

Gets or sets the objects for circular reference.

```csharp
public HashSet<ObjectBase> EntitiesForCircularReference { get; set; }

```

#### Property Value

[HashSet](https://learn.microsoft.com/dotnet/api/system.collections.generic.hashset-1)&lt;[ObjectBase](VM.Managed.ObjectBase.md)&gt;

### Extra

Gets the extra object information.

```csharp
public object Extra { get; }

```

#### Property Value

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

### InnerEventArgument

Gets the inner event.

```csharp
public LinkEventArgs InnerEventArgument { get; }

```

#### Property Value

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

### PreviousEventNotifier

Gets the previous linked object.

```csharp
public object PreviousEventNotifier { get; }

```

#### Property Value

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

### Reason

Gets the type of evnet.

```csharp
public NotifyReason Reason { get; }

```

#### Property Value

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

## Methods

### IsDestroying(object)

```csharp
public bool IsDestroying(object objNotifier)

```

#### Parameters

`objNotifier` [object](https://learn.microsoft.com/dotnet/api/system.object)

#### Returns

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

### IsUpdating(object)

```csharp
public bool IsUpdating(object objNotifier)

```

#### Parameters

`objNotifier` [object](https://learn.microsoft.com/dotnet/api/system.object)

#### Returns

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