public class BaseDal<T> where T : class, new()
{
DataModelContainer db = new DataModelContainer();
/// <summary>
/// 条件查询
/// </summary>
/// <param name="where"></param>
/// <returns></returns>
public IQueryable<T> GetEntities(Expression<Func<T, bool>> where)
{
return db.Set<T>().Where(where).AsQueryable();
}
/// <summary>
/// 分页查询
/// </summary>
/// <typeparam name="S"></typeparam>
/// <param name="pageSize"></param>
/// <param name="pageIndex"></param>
/// <param name="count"></param>
/// <param name="where"></param>
/// <param name="orderBy"></param>
/// <param name="isAsc"></param>
/// <returns></returns>
public IQueryable<T> GetPageEntities<S>(int pageSize, int pageIndex, out int count, Expression<Func<T, bool>> where, Expression<Func<T, S>> orderBy, bool isAsc)
{
count = db.Set<T>().Where(where).Count();
if (isAsc)
{
var temp = db.Set<T>().Where(where).OrderBy<T, S>(orderBy).Skip(pageSize).Take(pageSize * (pageIndex - 1)).AsQueryable();
return temp;
}
else
{
var temp = db.Set<T>().Where(where).OrderByDescending<T, S>(orderBy).Skip(pageSize).Take(pageSize * (pageIndex - 1)).AsQueryable();
return temp;
}
}
/// <summary>
/// 增加
/// </summary>
/// <param name="entity"></param>
/// <returns></returns>
public T Add(T entity)
{
db.Set<T>().Add(entity);
db.SaveChanges();
return entity;
}
/// <summary>
/// 修改
/// </summary>
/// <param name="entity"></param>
/// <returns></returns>
public bool Update(T entity)
{
db.Entry(entity).State = EntityState.Modified;
return db.SaveChanges() > 0;
}
/// <summary>
/// 删除
/// </summary>
/// <param name="entity"></param>
/// <returns></returns>
public bool Delete(T entity)
{
db.Entry(entity).State = EntityState.Deleted;
return db.SaveChanges() > 0;
}
}