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# ConcurrentDictionary

> Extension methods for ConcurrentDictionary from System.Collections.Concurrent

## Definition

**Assembly:** System.Collections.Concurrent.dll

**Namespace:** System.Collections.Concurrent

## Syntax

```csharp theme={"dark"}
System.Collections.Concurrent.ConcurrentDictionary<string, object>
```

## Summary

This type is defined in System.Collections.Concurrent.

## Remarks

See \[Microsoft documentation]\([https://learn.microsoft.com/dotnet/api/system.collections.concurrent.concurrentdictionary\{system.string](https://learn.microsoft.com/dotnet/api/system.collections.concurrent.concurrentdictionary\{system.string), system.object}) for more information about the rest of the API.

## Methods

### <Icon icon="puzzle-piece" iconType="duotone" color="#419AC5" size={24} className="mr-2" /> Filter <Badge color="green">Extension</Badge>

<Note>Extension method from `System.Collections.Concurrent.SimpleMessageBus_ConcurrentDictionaryExtensions`</Note>

Filters the metadata [ConcurrentDictionary\`2](https://learn.microsoft.com/dotnet/api/system.collections.concurrent.concurrentdictionary-2) to exclude keys ending with "-Status" or "-Timestamp".

#### Syntax

```csharp theme={"dark"}
public static System.Collections.Concurrent.ConcurrentDictionary<string, object> Filter(System.Collections.Concurrent.ConcurrentDictionary<string, object> metadata)
```

#### Parameters

| Name       | Type                                                                 | Description                        |
| ---------- | -------------------------------------------------------------------- | ---------------------------------- |
| `metadata` | `System.Collections.Concurrent.ConcurrentDictionary<string, object>` | The metadata dictionary to filter. |

#### Returns

Type: `System.Collections.Concurrent.ConcurrentDictionary<string, object>`
A new concurrent dictionary containing only the non-status entries.

#### Remarks

This method helps filter out handler execution metadata when copying metadata between events,
ensuring that the execution status of one event doesn't affect another.

### <Icon icon="puzzle-piece" iconType="duotone" color="#419AC5" size={24} className="mr-2" /> FilterAndCombine <Badge color="green">Extension</Badge>

<Note>Extension method from `System.Collections.Concurrent.SimpleMessageBus_ConcurrentDictionaryExtensions`</Note>

Filters the metadata dictionary to exclude keys ending with "-Status" and combines it with the payload dictionary.

#### Syntax

```csharp theme={"dark"}
public static System.Collections.Generic.Dictionary<string, object> FilterAndCombine(System.Collections.Concurrent.ConcurrentDictionary<string, object> metadata, System.Collections.Generic.Dictionary<string, object> payload)
```

#### Parameters

| Name       | Type                                                                 | Description                                                   |
| ---------- | -------------------------------------------------------------------- | ------------------------------------------------------------- |
| `metadata` | `System.Collections.Concurrent.ConcurrentDictionary<string, object>` | The metadata dictionary to filter and combine.                |
| `payload`  | `System.Collections.Generic.Dictionary<string, object>`              | The payload dictionary to combine with the filtered metadata. |

#### Returns

Type: `System.Collections.Generic.Dictionary<string, object>`
A new dictionary containing the combined entries from the payload and filtered metadata.

#### Remarks

This method helps filter out handler execution status from the metadata when constructing
new messages or passing metadata between events in a processing chain.