/// <summary>
/// 获取当前集合分页列表
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="page"></param>
/// <param name="pageSize"></param>
/// <param name="sortInfo"></param>
/// <param name="predicate"></param>
/// <param name="tracking"></param>
/// <returns></returns>
protected PagedList <T> GetPagedList <T>(int page, int pageSize, SortInfo sortInfo, Expression <Func <T, bool> > predicate = null, bool tracking = false)
where T : class
{
return(this.Queryable <T, PagedList <T> >(query =>
{
//排序
query = query.OrderBy(sortInfo.Column, sortInfo.Ascending);
//筛选条件
if (predicate != null)
{
query = query.Where(predicate);
}
return new PagedList <T>
{
RowSet = query.Skip((page - 1) * pageSize).Take(pageSize).ToList(),
Count = query.Count()
};
}, tracking));
}
/// <summary>
/// 解析并生成排序语句
/// 若解析失败则返回默认排序信息
/// </summary>
/// <param name="orderBy">>格式为：field_(DESC/ASC)</param>
/// <param name="defaultSort"></param>
/// <param name="includeSortableColumns">允许排序的字段信息集合</param>
/// <returns></returns>
protected SortInfo GetSortInfo(string orderBy, SortInfo defaultSort, IEnumerable <AliasColumn> includeSortableColumns = null)
{
var sortInfo = SortInfo.Parse(orderBy);
if (sortInfo == null)
{
sortInfo = defaultSort;
}
else
{
var column = includeSortableColumns.SingleOrDefault(i => i.Column == sortInfo.Column);
if (column == null)
{
throw new ArgumentException("无效的排序字符串");
}
//判断排序字段是否有别名若有则转换为含有别名的字段
if (!string.IsNullOrEmpty(column.Alias))
{
sortInfo.Column = column.ToString();
}
}
return(sortInfo);
}
/// <summary>
/// 获取当前集合列表
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="predicate">查询表达式</param>
/// <param name="sortInfo">排序信息</param>
/// <param name="tracking"></param>
/// <returns></returns>
protected IEnumerable <T> GetList <T>(Expression <Func <T, bool> > predicate = null, SortInfo sortInfo = null, bool tracking = false)
where T : class
{
return(this.Queryable <T, IEnumerable <T> >(query =>
{
//排序
if (sortInfo != null)
{
query = query.OrderBy(sortInfo.Column, sortInfo.Ascending);
}
//筛选条件
if (predicate != null)
{
query = query.Where(predicate);
}
return query.ToList();
}, tracking));
}
