# OpcPathProbingCollection Members

> Reference: Represents a collection of OpcPathProbing instances.

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

Inherits members from [Collection&lt;OpcPathProbing&gt;](https://learn.microsoft.com/dotnet/api/system.collections.objectmodel.collection-1).

## Constructors

### OpcPathProbingCollection

Initializes a new instance of the [OpcPathProbingCollection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcpathprobingcollection/) class.

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

```csharp
public OpcPathProbingCollection()
```

</div>

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

```vbnet
Public Sub New()
```

</div>

## Methods

### Evaluate

Processes the evaluation of all [OpcPathProbing](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcpathprobing/) items stored in this [OpcPathProbingCollection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcpathprobingcollection/) using the [Evaluate](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcpathprobing/members#evaluate) method of each item and offers the first fulfilled [string](https://learn.microsoft.com/dotnet/api/system.string)-based path evaluation result.

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

```csharp
public string Evaluate()
```

</div>

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

```vbnet
Public Function Evaluate() As String
```

</div>

**Returns**

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

The first fulfilled [string](https://learn.microsoft.com/dotnet/api/system.string)-based path evaluation result or a null reference (Nothing in Visual Basic) if there is no [OpcPathProbing](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcpathprobing/) item stored in this [OpcPathProbingCollection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcpathprobingcollection/) or all probing mechanims used by the items failed to evaluate their path information against their different path requirements.