---
title: "Class CollectionExtensionMethods | Customer's Canvas On-Premises"
canonical: "https://customerscanvas.com/docs/on-premises/design-atoms-cs/reference/api/Aurigma.DesignAtoms.ExtensionMethods/CollectionExtensionMethods/"
---

# Class CollectionExtensionMethods

> **Inheritance:** `System.Object` -> CollectionExtensionMethods

###### **Namespace**: [Aurigma.DesignAtoms.ExtensionMethods](https://customerscanvas.com/docs/on-premises/design-atoms-cs/reference/api/Aurigma.DesignAtoms.ExtensionMethods.md)

###### **Assembly**: Aurigma.DesignAtoms.dll

```csharp title="Syntax"
public static class CollectionExtensionMethods
```

## Inherited Members

* `System.Object.ToString`
* `System.Object.Equals(System.Object)`
* `System.Object.Equals(System.Object,System.Object)`
* `System.Object.ReferenceEquals(System.Object,System.Object)`
* `System.Object.GetHashCode`
* `System.Object.GetType`
* `System.Object.MemberwiseClone`

## Methods

### Concat<T>

```csharp
public static IEnumerable<T> Concat<T>(this IEnumerable<T> collection, T element)
```

##### Parameters

| Type | Name | Description |
|:---|:---|:---|
| `System.Collections.Generic.IEnumerable<<T>>` | *collection* |  |
| `<T>` | *element* |  |

##### Returns

`System.Collections.Generic.IEnumerable<<T>>`

### GetCollectionHashCode&lt;T&gt;

```csharp
public static int? GetCollectionHashCode<T>(this IEnumerable<T> collection)
```

##### Parameters

| Type | Name | Description |
|:---|:---|:---|
| `System.Collections.Generic.IEnumerable<<T>>` | *collection* |  |

##### Returns

`System.Nullable<System.Int32>`

### AddRange&lt;T&gt;

```csharp
public static void AddRange<T>(this ICollection<T> collection, IEnumerable<T> items)
```

##### Parameters

| Type | Name | Description |
|:---|:---|:---|
| `System.Collections.Generic.ICollection<<T>>` | *collection* |  |
| `System.Collections.Generic.IEnumerable<<T>>` | *items* |  |