# OpcMonitoredItemsEventArgs Members

> Reference: Provides the event data for the MonitoredItemsCreated, MonitoredItemsDeleted and MonitoredItemsModified event.

<dl class="api-definition">
<dt>Type</dt>
<dd><a href="./">OpcMonitoredItemsEventArgs</a></dd>
<dt>Namespace</dt>
<dd><a href="../namespaces/opc.uafx.server">Opc.UaFx.Server</a></dd>
<dt>Assembly</dt>
<dd>Opc.UaFx.Advanced.dll</dd>
<dt>Package</dt>
<dd>Opc.UaFx.Advanced v2.59.0</dd>
</dl>

Inherits members from [EventArgs](https://learn.microsoft.com/dotnet/api/system.eventargs).

## Constructors

### OpcMonitoredItemsEventArgs

Initializes a new instance of the [OpcMonitoredItemEventArgs](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcmonitoreditemeventargs/) using the `context`, `items` and `nodes` specified.

<div class="api-signature" data-lang="csharp">

```csharp
public OpcMonitoredItemsEventArgs(
    OpcContext context,
    OpcMonitoredItem[] items,
    IOpcNode[] nodes)
```

</div>

<div class="api-signature" data-lang="vbnet">

```vbnet
Public Sub New(
    context As OpcContext,
    items As OpcMonitoredItem(),
    nodes As IOpcNode())
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `context` | [OpcContext](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opccontext/) | The [OpcContext](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opccontext/) used to create, delete or modify a [OpcMonitoredItem](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcmonitoreditem/). |
| `items` | [OpcMonitoredItem](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcmonitoreditem/)[] | An array of [OpcMonitoredItem](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcmonitoreditem/) instances affected by the event. |
| `nodes` | [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/)[] | An array of [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) instances observed by the [OpcMonitoredItem](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcmonitoreditem/) elements specified by `items`. |

**Exceptions**

| Exception | Condition |
|---|---|
| [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `context`, `items` or `nodes` is a null reference (Nothing in Visual Basic). |

## Properties

### Context

Gets the information of the environment used to create, delete or modify the [Items](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcmonitoreditemseventargs/members#items).

<div class="api-signature" data-lang="csharp">

```csharp
public OpcContext Context { get; }
```

</div>

<div class="api-signature" data-lang="vbnet">

```vbnet
Public ReadOnly Property Context As OpcContext
```

</div>

**Property value**

[OpcContext](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opccontext/)

An instance of the [OpcContext](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opccontext/) class used by the source of the event this event data belongs.

### Items

Gets the monitored items affected by the event.

<div class="api-signature" data-lang="csharp">

```csharp
public OpcMonitoredItem[] Items { get; }
```

</div>

<div class="api-signature" data-lang="vbnet">

```vbnet
Public ReadOnly Property Items As OpcMonitoredItem()
```

</div>

**Property value**

[OpcMonitoredItem](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcmonitoreditem/)[]

An array of [OpcMonitoredItem](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcmonitoreditem/) class instances.

### Nodes

Gets the nodes which are observed by the monitored [Items](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcmonitoreditemseventargs/members#items).

<div class="api-signature" data-lang="csharp">

```csharp
public IOpcNode[] Nodes { get; }
```

</div>

<div class="api-signature" data-lang="vbnet">

```vbnet
Public ReadOnly Property Nodes As IOpcNode()
```

</div>

**Property value**

[IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/)[]

An array of instances implementing the [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) interface.