/// <summary>
/// 从集合中查询指定数据筛选的分页信息
/// </summary>
/// <typeparam name="TEntity">动态实体类型</typeparam>
/// <typeparam name="TResult">要返回动态实体类型</typeparam>
/// <param name="source">数据源</param>
/// <param name="predicate">查询条件表达式</param>
/// <param name="pageParameters">分页参数</param>
/// <param name="selector">数据筛选表达式</param>
/// <returns></returns>
public static async Task <PageResult <TEntity> > ToPageAsync <TEntity>(this IQueryable <TEntity> source, PageParameters pageParameters)
{
pageParameters.NotNull(nameof(pageParameters));
var result = await source.WhereAsync(pageParameters.PageIndex, pageParameters.PageSize, null, pageParameters.OrderConditions);
var list = await result.data.ToArrayAsync();
var total = result.totalNumber;
return(new PageResult <TEntity>(list, total));
}
/// <summary>
/// 从集合中查询指定输出DTO的分页信息
/// </summary>
/// <typeparam name="TEntity">动态实体类型</typeparam>
/// <typeparam name="TOutputDto">输出DTO数据类型</typeparam>
/// <param name="source">数据源</param>
/// <param name="predicate">查询条件表达式</param>
/// <param name="pageParameters">分页参数</param>
/// <returns></returns>
public static async Task <PageResult <TOutputDto> > ToPageAsync <TEntity, TOutputDto>(this IQueryable <TEntity> source, Expression <Func <TEntity, bool> > predicate, PageParameters pageParameters)
where TOutputDto : IOutputDto
{
pageParameters.NotNull(nameof(pageParameters));
var result = await source.WhereAsync(pageParameters.PageIndex, pageParameters.PageSize, predicate, pageParameters.OrderConditions);
var list = await result.data.ToOutput <TOutputDto>().ToArrayAsync();
var total = result.totalNumber;
return(new PageResult <TOutputDto>(list, total));
}
/// <summary>
/// 从集合中查询指定数据筛选的分页信息
/// </summary>
/// <typeparam name="TEntity">动态实体类型</typeparam>
/// <typeparam name="TResult">要返回动态实体类型</typeparam>
/// <param name="source">数据源</param>
/// <param name="predicate">查询条件表达式</param>
/// <param name="pageParameters">分页参数</param>
/// <param name="selector">数据筛选表达式</param>
/// <returns></returns>
public static async Task <IPageResult <TResult> > ToPageAsync <TEntity, TResult>(this IQueryable <TEntity> source, Expression <Func <TEntity, bool> > predicate, PageParameters pageParameters, Expression <Func <TEntity, TResult> > selector)
{
pageParameters.NotNull(nameof(pageParameters));
selector.NotNull(nameof(selector));
var result = await source.WhereAsync(pageParameters.PageIndex, pageParameters.PageRow, predicate, pageParameters.OrderConditions);
var list = await result.data.Select(selector).ToArrayAsync();
var total = result.totalNumber;
return(new PageResult <TResult>(list, total));
}