---
url: /indicators/bar-part.md
description: >-
  Basic price bar transforms (e.g. HL2, OHL3, etc.) and isolation of individual
  price bar candle parts from a full OHLCV bar.
package: FacioQuo.Stock.Indicators
docs_version: v3
canonical: https://dotnet.stockindicators.dev/indicators/bar-part
generated: 2026-10-15T06:15:05.027Z
commit: 4044e66ee11c1611f024b18d0096806706a00c9d
---

# Basic price bar transforms

Returns a reusable (chainable) basic bar transform (e.g. HL2, OHL3, etc.) by isolating a single component part value or calculated value from the full OHLCV bar candle parts.

```csharp
// C# usage syntax
IReadOnlyList<TimeValue> results =
  bars.Use(candlePart);

// alternate syntax
IReadOnlyList<TimeValue> results =
  bars.ToBarPart(candlePart);
```

## Parameters

| param | description |
| ----- | ----------- |
| `candlePart`*`CandlePart`* | The [OHLCV](/guide/getting-started.md#historical-bars) element or simple price transform |

### Historical price bars requirements

You must have at least 1 period of `bars`.

`bars` is a collection of generic `TBar` historical price bars.  It should have a consistent frequency (day, hour, minute, etc). See [the Guide](/guide/getting-started.md#historical-bars) for more information.

#### `CandlePart` enum options

| enum / value | description |
| ----- | ----------- |
| `CandlePart.Open`0 | `Open` price |
| `CandlePart.High`1 | `High` price |
| `CandlePart.Low`2 | `Low` price |
| `CandlePart.Close`3 | `Close` price |
| `CandlePart.Volume`4 | `Volume` |
| `CandlePart.HL2`5 | `(High+Low)/2` |
| `CandlePart.HLC3`6 | `(High+Low+Close)/3` |
| `CandlePart.OC2`7 | `(Open+Close)/2` |
| `CandlePart.OHL3`8 | `(Open+High+Low)/3` |
| `CandlePart.OHLC4`9 | `(Open+High+Low+Close)/4` |

## Response

```csharp
IReadOnlyList<TimeValue>
```

* This method returns a time series of all available indicator values for the `bars` provided.
* It always returns the same number of elements as there are in the historical price bars.
* It does not return a single incremental indicator value.

### `TimeValue` type

| property | description |
| ----- | ----------- |
| `Timestamp`*`DateTime`* | Date from evaluated `TBar` |
| `Value`*`double`* | Price of `CandlePart` option |

### Utilities

* [.Find(lookupDate)](/utilities/results.md#find-by-date)

See [Utilities and helpers](/utilities.md) for more information.

## Chaining

Results can be further processed on `Value` with additional chain-enabled indicators.

```csharp
// example
var results = bars
    .Use(CandlePart.OHLC4)
    .ToRsi(..);
```

This indicator must be generated from `bars` and **cannot** be generated from results of another chain-enabled indicator or method.

See [Chaining indicators](/guide/chaining.md) for more.

## Streaming

Subscribe to a `BarHub` for streaming scenarios:

```csharp
BarHub barHub = new();
BarPartHub observer = barHub.ToBarPartHub(CandlePart.HL2);

// call from your WebSocket or SSE message handler
void OnBarReceived(IBar bar) => barHub.Add(bar);

// results fill as the handler runs
IReadOnlyList<TimeValue> results = observer.Results;
```

See [Buffer lists](/guide/styles/buffer.md) and [Stream hubs](/guide/styles/stream.md) for full usage guides.

## Buffering

Use a `BarPartList` for incremental buffering scenarios:

```csharp
BarPartList buffer = new(CandlePart.Close);

// call from your WebSocket or SSE message handler
void OnBarReceived(IBar bar) => buffer.Add(bar);

// results fill as the handler runs
IReadOnlyList<TimeValue> results = buffer;
```