/// <summary>
/// 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">表示 LINQ 查询的表达式树</param>
/// <returns></returns>
public TResult Execute <TResult>(Expression expression)
{
if (!ExecuteCache.CanCache(expression))
{
return((TResult)entityQueryProvider.Execute(expression));
}
return(ExecuteCache.TryGet(expression, () => (TResult)entityQueryProvider.Execute(expression)));
}
/// <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)));
}
public IAsyncEnumerable <TResult> ExecuteEnumerableAsync <TResult>(Expression expression, CancellationToken cancellationToken)
{
if (!ExecuteCache.CanCache(expression))
{
return(entityQueryProvider.ExecuteEnumerableAsync <TResult>(expression, cancellationToken));
}
else
{
return(ExecuteCache.TryGet(expression, () => entityQueryProvider.ExecuteEnumerableAsync <TResult>(expression, cancellationToken)));
}
}
private IList <T> ExecuteList()
{
if (list == null)
{
if (provider == null)
{
list = new List <T>();
}
else
{
list = ExecuteCache.TryGet(expression, () => provider.Execute <IEnumerable <T> >(expression)?.ToList());
}
}
return(list);
}
/// <summary>
/// 执行指定表达式树所表示的查询。
/// </summary>
/// <param name="expression">表示 LINQ 查询的表达式树</param>
/// <returns></returns>
public object Execute(Expression expression)
{
ExecuteCache.TryExpire(expression);
return(entityQueryProvider.Execute(expression));
}