/// <summary>
/// 倒序
/// </summary>
/// <typeparam name="T"></typeparam>
/// <typeparam name="TResult"></typeparam>
/// <param name="obj"></param>
/// <param name="predicate"></param>
/// <returns></returns>
public static IQuery <T> ThenByDescending <T, TResult>(this IQuery <T> obj, Expression <Func <T, TResult> > predicate)
{
if (string.IsNullOrWhiteSpace(obj.OrderBy))
{
throw new Exception("请先调用OrderBy");
}
obj.OrderBy = $"{obj.OrderBy},{QueryableBuilder.GetPropertyName(predicate)} DESC";
return(obj);
}
/// <summary>
/// 倒序
/// </summary>
/// <typeparam name="T"></typeparam>
/// <typeparam name="TResult"></typeparam>
/// <param name="obj"></param>
/// <param name="predicate"></param>
/// <returns></returns>
public static IQuery <T> OrderByDescending <T, TResult>(this IQuery <T> obj, Expression <Func <T, TResult> > predicate)
{
obj.OrderBy = $"ORDER BY {QueryableBuilder.GetPropertyName(predicate)} DESC";
return(obj);
}
/// <summary>
/// 顺序
/// </summary>
/// <typeparam name="T"></typeparam>
/// <typeparam name="TResult"></typeparam>
/// <param name="obj"></param>
/// <param name="predicate"></param>
/// <returns></returns>
public static IOrderQuery <T> ThenBy <T, TResult>(this IOrderQuery <T> obj, Expression <Func <T, TResult> > predicate)
{
obj.OrderBy = $"{obj.OrderBy},{QueryableBuilder.GetPropertyName(predicate)} ASC";
return(obj);
}