# PdfTrustService class

> A trust service of a trusted list, with its current information and its history.

Namespace: [PdfNetStack.Signing](https://www.jadev-corp.com/api/pdfnetstack-signing/)  
Assembly: PdfNetStack.dll  
Package: `PdfNetStack`

A trust service of a trusted list, with its current information and its history.

```csharp
public sealed class PdfTrustService : PdfTrustServiceInformation
```

**Inheritance**

[object](https://learn.microsoft.com/dotnet/api/system.object) ← 
[PdfTrustServiceInformation](https://www.jadev-corp.com/api/pdfnetstack-signing/pdftrustserviceinformation/) ← 
[PdfTrustService](https://www.jadev-corp.com/api/pdfnetstack-signing/pdftrustservice/)

## Properties

### <a id="PdfNetStack_Signing_PdfTrustService_History"></a> History

Earlier statuses, as the list orders them (usually newest first).

```csharp
public IReadOnlyList<PdfTrustServiceInformation> History { get; }
```

#### Property Value

 [IReadOnlyList](https://learn.microsoft.com/dotnet/api/system.collections.generic.ireadonlylist\-1)<[PdfTrustServiceInformation](https://www.jadev-corp.com/api/pdfnetstack-signing/pdftrustserviceinformation/)\>

### <a id="PdfNetStack_Signing_PdfTrustService_Provider"></a> Provider

The provider of the service.

```csharp
public PdfTrustServiceProvider Provider { get; }
```

#### Property Value

 [PdfTrustServiceProvider](https://www.jadev-corp.com/api/pdfnetstack-signing/pdftrustserviceprovider/)

## Methods

### <a id="PdfNetStack_Signing_PdfTrustService_At_System_DateTimeOffset_"></a> At\(DateTimeOffset\)

The information in force at a time: the current information or the history entry with the latest starting time not after it; null before the first.

```csharp
public PdfTrustServiceInformation? At(DateTimeOffset time)
```

#### Parameters

`time` [DateTimeOffset](https://learn.microsoft.com/dotnet/api/system.datetimeoffset)

#### Returns

 [PdfTrustServiceInformation](https://www.jadev-corp.com/api/pdfnetstack-signing/pdftrustserviceinformation/)?

Source: https://www.jadev-corp.com/pdfnetstack/api/pdfnetstack-signing/pdftrustservice/