/// <summary>
/// 根据自定义条件查询数据
/// </summary>
/// <typeparam name="PEntity"></typeparam>
/// <param name="specification"></param>
/// <param name="sortBy"></param>
/// <param name="pageIndex"></param>
/// <param name="pageSize"></param>
/// <param name="desc"></param>
/// <returns></returns>
public List <T> GetPaged(ISpecification <T> specification, int pageIndex, int pageSize, out int totalCount, Func <T, object> sortBy, bool desc = true)
{
List <T> list = null;
totalCount = 0;
if (specification != null)
{
try
{
using (BaseViewDbContext <T> db = new BaseViewDbContext <T>())
{
if (desc)
{
list = db.BaseDbSet.Where(specification.Predicate).OrderByDescending(sortBy).Skip((pageIndex - 1) * pageSize).Take(pageSize).ToList();
}
else
{
list = db.BaseDbSet.Where(specification.Predicate).OrderBy(sortBy).Skip((pageIndex - 1) * pageSize).Take(pageSize).ToList();
}
totalCount = db.BaseDbSet.Where(specification.Predicate).Count();
}
}
catch (Exception ex)
{
log.Error("获取失败", ex);
//throw new Exception("获取失败!", ex);
}
}
return(list);
}
/// <summary>
/// 获取该实体的查询
/// </summary>
/// <param name="top">前几条，默认排序</param>
/// <param name="predicate">表达式</param>
/// <param name="sortBy">排序字段</param>
/// <param name="desc">默认True为降序,False升序</param>
/// <returns></returns>
public List <T> GetQuery(int top, Expression <Func <T, bool> > predicate, Func <T, object> sortBy, bool desc = true)
{
List <T> list = null;
if (predicate != null)
{
try
{
using (BaseViewDbContext <T> db = new BaseViewDbContext <T>())
{
if (desc)
{
list = db.BaseDbSet.Where(predicate).OrderByDescending(sortBy).Take(top).ToList();
}
else
{
list = db.BaseDbSet.Where(predicate).OrderBy(sortBy).Take(top).ToList();
}
}
}
catch (Exception ex)
{
log.Error("获取失败", ex);
//throw new Exception("获取失败!", ex);
}
}
return(list);
}
/// <summary>
/// 获取该实体的查询
/// </summary>
/// <param name="top">前几条，默认排序</param>
/// <param name="predicate">表达式</param>
/// <returns></returns>
public List <T> GetQuery(int top, Expression <Func <T, bool> > predicate)
{
List <T> list = null;
if (predicate != null)
{
try
{
using (BaseViewDbContext <T> db = new BaseViewDbContext <T>())
{
list = db.BaseDbSet.Where(predicate).Take(top).ToList();
}
}
catch (Exception ex)
{
log.Error("获取失败", ex);
//throw new Exception("获取失败!", ex);
}
}
return(list);
}
/// <summary>
/// 根据lamda表达式获取单一实体,如果没有找到则返回null
/// </summary>
/// <param name="key"></param>
/// <returns></returns>
public T Single(Expression <Func <T, bool> > predicate)
{
T entity = new T();
if (predicate != null)
{
try
{
using (BaseViewDbContext <T> db = new BaseViewDbContext <T>())
{
entity = db.BaseDbSet.FirstOrDefault(predicate);
}
}
catch (Exception ex)
{
log.Error("获取失败", ex);
//throw new Exception("获取失败!", ex);
}
}
return(entity);
}
