/// <summary>
/// 把<see cref="IOrderedQueryable{T}"/>集合继续指定字段排序方式进行排序
/// </summary>
/// <typeparam name="T">动态类型</typeparam>
/// <param name="source">要排序的数据集</param>
/// <param name="sortCondition">列表字段排序条件</param>
/// <returns></returns>
public static IOrderedQueryable <T> ThenBy <T>(this IOrderedQueryable <T> source, SortCondition sortCondition)
{
source.CheckNotNull("source");
sortCondition.CheckNotNull("sortCondition");
return(source.ThenBy(sortCondition.SortField, sortCondition.ListSortDirection));
}
/// <summary>
/// 初始化一个 默认参数（第1页，每页20，排序条件为空）的分页查询条件信息类 的新实例
/// </summary>
public PageCondition()
{
PageIndex = 1;
PageSize = 20;
SortConditions = new SortCondition[] { };
}
/// <summary>
/// 把<see cref="IEnumerable{T}"/>集合按指定字段排序条件进行排序
/// </summary>
/// <typeparam name="T">动态类型</typeparam>
/// <param name="source">要排序的数据集</param>
/// <param name="sortCondition">列表字段排序条件</param>
/// <returns></returns>
public static IOrderedEnumerable <T> OrderBy <T>(this IEnumerable <T> source, SortCondition <T> sortCondition)
{
sortCondition.CheckNotNull("sortCondition");
return(source.OrderBy(sortCondition.SortField, sortCondition.ListSortDirection));
}