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# IQueryExpressionProcessor

> Represents a service that processes a query expression.

## Definition

**Assembly:** Microsoft.Restier.Core.dll

**Namespace:** Microsoft.Restier.Core.Query

## Syntax

```csharp theme={"dark"}
Microsoft.Restier.Core.Query.IQueryExpressionProcessor
```

## Summary

Represents a service that processes a query expression.

## Remarks

Query expression processing converts an expression node into a
different expression node according to API logic such as a
restricting filter on top of some composable API data.

Processing is the third step that occurs when visiting a query
expression after its children have been visited, so it occurs during
upward traversal of the query expression and after inspection and
expansion. Since processing fundamentally alters the query expression,
the resulting expression is recursively processed to ensure that all
appropriate normalization, inspection, expansion, processing and
sourcing occurs.

## Methods

### <Icon icon="function" iconType="duotone" color="#419AC5" size={24} className="mr-2" /> Process <Badge color="orange">Abstract</Badge>

Processes an expression.

#### Syntax

```csharp theme={"dark"}
System.Linq.Expressions.Expression Process(Microsoft.Restier.Core.Query.QueryExpressionContext context)
```

#### Parameters

| Name      | Type                                                  | Description                   |
| --------- | ----------------------------------------------------- | ----------------------------- |
| `context` | `Microsoft.Restier.Core.Query.QueryExpressionContext` | The query expression context. |

#### Returns

Type: `System.Linq.Expressions.Expression`
A processed expression of the same type as the visited node, or
if processing did not apply, the visited node.