/// <summary>
/// 异步的，执行指定表达式树所表示的查询。
/// </summary>
/// <typeparam name="TResult">执行查询所生成的值的类型。</typeparam>
/// <param name="expression">一个表示的表达式树 LINQ 查询。</param>
/// <param name="cancellationToken">取消操作的通知。</param>
/// <returns></returns>
public async Task <TResult> ExecuteAsync <TResult>(Expression expression, CancellationToken cancellationToken)
{
if (!ExecuteCache.CanCache(expression))
{
return(await entityQueryProvider.ExecuteAsync <TResult>(expression));
}
return(await ExecuteCache.TryGet(expression, () => entityQueryProvider.ExecuteAsync <TResult>(expression, cancellationToken)));
}
