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# IQueryExecutor

> Represents a service that executes a query.

## Definition

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

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

## Syntax

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

## Summary

Represents a service that executes a query.

## Remarks

Data provider implemented IQueryExecutor should only handle queries against the specific
provider, and delegates all other queries to inner IQueryExecutor.

## Methods

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

Asynchronously executes a singleton
query and produces a query result.

#### Syntax

```csharp theme={"dark"}
System.Threading.Tasks.Task<Microsoft.Restier.Core.Query.QueryResult> ExecuteExpressionAsync<TResult>(Microsoft.Restier.Core.Query.QueryContext context, System.Linq.IQueryProvider queryProvider, System.Linq.Expressions.Expression expression, System.Threading.CancellationToken cancellationToken)
```

#### Parameters

| Name                | Type                                        | Description                                     |
| ------------------- | ------------------------------------------- | ----------------------------------------------- |
| `context`           | `Microsoft.Restier.Core.Query.QueryContext` | The query context.                              |
| `queryProvider`     | `System.Linq.IQueryProvider`                | A query provider to execute the expression.     |
| `expression`        | `System.Linq.Expressions.Expression`        | An expression to be composed on the base query. |
| `cancellationToken` | `System.Threading.CancellationToken`        | A cancellation token.                           |

#### Returns

Type: `System.Threading.Tasks.Task<Microsoft.Restier.Core.Query.QueryResult>`
A task that represents the asynchronous
operation whose result is a query result.

#### Type Parameters

* `TResult` - The type of the singleton query result.

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

Asynchronously executes a query and produces a query result.

#### Syntax

```csharp theme={"dark"}
System.Threading.Tasks.Task<Microsoft.Restier.Core.Query.QueryResult> ExecuteQueryAsync<TElement>(Microsoft.Restier.Core.Query.QueryContext context, System.Linq.IQueryable<TElement> query, System.Threading.CancellationToken cancellationToken)
```

#### Parameters

| Name                | Type                                        | Description           |
| ------------------- | ------------------------------------------- | --------------------- |
| `context`           | `Microsoft.Restier.Core.Query.QueryContext` | The query context.    |
| `query`             | `System.Linq.IQueryable<TElement>`          | A composed query.     |
| `cancellationToken` | `System.Threading.CancellationToken`        | A cancellation token. |

#### Returns

Type: `System.Threading.Tasks.Task<Microsoft.Restier.Core.Query.QueryResult>`
A task that represents the asynchronous
operation whose result is a query result.

#### Type Parameters

* `TElement` - The type of the elements in the query.