/// <summary>
/// 获取指定查询条件组的查询表达式
/// </summary>
/// <typeparam name="T">表达式实体类型</typeparam>
/// <param name="group">查询条件组，如果为null，则直接返回 true 表达式</param>
/// <returns>查询表达式</returns>
public virtual Expression <Func <T, bool> > GetExpression <T>(FilterGroup group)
{
return(FilterHelper.GetExpression <T>(group));
}
/// <summary>
/// 初始化一个<see cref="PageRequest"/>类型的新实例
/// </summary>
public PageRequest()
{
PageCondition = new PageCondition(1, 20);
FilterGroup = new FilterGroup();
}
/// <summary>
/// 验证指定查询条件组是否能正常转换为表达式
/// </summary>
/// <param name="group">查询条件组</param>
/// <param name="type">实体类型</param>
/// <returns>验证操作结果</returns>
public virtual OperationResult CheckFilterGroup(FilterGroup group, Type type)
{
return(FilterHelper.CheckFilterGroup(group, type));
}
