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# IQueryExpressionExpander

> Represents a service that expands a query expression.

## Definition

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

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

## Syntax

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

## Summary

Represents a service that expands a query expression.

## Remarks

Query expression expansion converts an expression that represents
normalized API data into an expression using more primitive nodes.

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

## Methods

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

Expands an expression.

#### Syntax

```csharp theme={"dark"}
System.Linq.Expressions.Expression Expand(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`
An expanded expression of the same type as the visited node, or
if expansion did not apply, the visited node or `null`.