namespace Application.Service.Pub;

public class PageExtend
{
    /// <summary>
    /// List 通用分页
    /// </summary>
    /// <param name="list">数据源</param>
    /// <param name="pageIndex">当前页码（从1开始）</param>
    /// <param name="pageSize">每页条数</param>
    /// <returns>当前页数据</returns>
    public static List<T> GetPageList<T>(List<T> list, int pageIndex, int pageSize)
    {
        // 空值保护
        if (list == null || list.Count == 0)
            return new List<T>();

        // 页码最小为 1
        pageIndex = pageIndex < 1 ? 1 : pageIndex;
    
        // 分页核心
        return list
            .Skip((pageIndex - 1) * pageSize)
            .Take(pageSize)
            .ToList();
    }
}