> For the complete documentation index, see [llms.txt](https://solr-express.gitbook.io/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://solr-express.gitbook.io/docs/5.0.0/tutorials/facets/field.md).

# Facet field

## Feature

Create a facet field

## How to

1. Configure facet

```csharp
    DocumentCollection<TechProductDocument> documentCollection; // from DI

    var rersult = documentCollection
        .Select()
        .FacetField(q => q.InStock)
        .Execute();
```

1. Optionally, change one or more settings

```csharp
    DocumentCollection<TechProductDocument> documentCollection; // from DI

    var rersult = documentCollection
        .Select()
        .FacetField(q => q.InStock, facet =>
        {
            facet.Minimum = 3;
            facet.Limit = 5;
        })
        .Execute();
```

1. Read data

```csharp
    rersult
        .Facets(out var data);

    foreach (FacetItemField facetItem in data)
    {
        // facetName = "InStock"
        var facetName = facetItem.Name;
        //facetType = FacetType.Field
        var facetType = facetItem.FacetType;

        foreach (var facetItemValue in facetItem.Values)
        {
            // nested = nested facet (if configured)
            var nested = facetItemValue.Facets;
            // key = value of item's value
            var key = facetItemValue.Key;
            // quantity = quantity of item's value
            var quantity = facetItemValue.Quantity;
        }
    }
```

## Settings

| Use case                                     | How to                                                                           |
| -------------------------------------------- | -------------------------------------------------------------------------------- |
| Sort type of result of facet                 | .FacetField(q => q.InStock, facet => facet.SortType = FacetSortType.CountAsc)    |
| Minimum count of itens in facet's result     | .FacetField(q => q.InStock, facet => facet.Minimum = 2)                          |
| Limit of itens in facet's result             | .FacetField(q => q.InStock, facet => facet.Limit = 10)                           |
| List of tags to exclude in facet calculation | .FacetField(q => q.InStock, facet => facet.Excludes = new\[] { "tag1", "tag2" }) |


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://solr-express.gitbook.io/docs/5.0.0/tutorials/facets/field.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.