/// <summary>
/// 根据条件，返回分页的文档集合
/// </summary>
/// <param name="predicate"></param>
/// <param name="pageIndex"></param>
/// <param name="pageSize"></param>
/// <returns></returns>
public virtual async Task <IPaged <T> > PagedSelectAsync(Expression <Func <T, bool> > predicate, int pageIndex, int pageSize)
{
if (pageIndex < 1)
{
pageIndex = 1;
}
if (pageSize < 1)
{
pageSize = 20;
}
var query = Collection.AsQueryable();
if (predicate != null)
{
query = query.Where(predicate);
}
var recordTotal = query.Count();
var pageTotal = recordTotal / pageSize;
if (recordTotal % pageSize > 0)
{
pageTotal++;
}
if (pageIndex > 1)
{
query = query.Skip((pageIndex - 1) * pageSize);
}
var records = await query.Take(pageSize).ToListAsync();
var pagedList = new Paged <T>()
{
PageTotal = pageTotal,
RecordTotal = recordTotal,
Index = pageIndex,
Size = pageSize
};
pagedList.AddRange(records);
return(pagedList);
}
public IPaged <T> Paged(Func <T, bool> predicate, int pageIndex, int pageSize)
{
var query = _dic.Where(kv => predicate.Invoke(kv.Value)).Select(kv => kv.Value);
if (predicate != null)
{
query = query.Where(predicate);
}
var enumerable = query as T[] ?? query.ToArray();
var total = enumerable.Count();
var list = enumerable.Skip((pageIndex - 1) * pageSize).Take(pageSize).ToList();
var result = new Paged <T>()
{
PageTotal = total % pageSize == 0 ? total / pageSize : total / pageSize + 1,
RecordTotal = total,
Index = pageIndex,
Size = pageSize
};
result.AddRange(list);
return(result);
}
/// <summary>
/// 根据条件，返回分页的文档集合
/// </summary>
/// <param name="filter"></param>
/// <param name="pageIndex"></param>
/// <param name="pageSize"></param>
/// <returns></returns>
public virtual async Task <IPaged <T> > PagedSelectAsync(FilterDefinition <T> filter, int pageIndex, int pageSize)
{
if (pageIndex < 1)
{
pageIndex = 1;
}
if (pageSize < 1)
{
pageSize = 20;
}
var fluent = Collection.Find(filter);
var recordTotal = fluent.Count();
var pageTotal = recordTotal / pageSize;
if (recordTotal % pageSize > 0)
{
pageTotal++;
}
if (pageIndex > 1)
{
fluent = fluent.Skip((pageIndex - 1) * pageSize);
}
var records = await fluent.Limit(pageSize).ToListAsync();
var pagedList = new Paged <T>()
{
PageTotal = (int)pageTotal,
RecordTotal = (int)recordTotal,
Index = pageIndex,
Size = pageSize
};
pagedList.AddRange(records);
return(pagedList);
}