BLToolKit:它支持IQueryable的?
-
25-09-2019 - |
题
通常与BLToolKit我以下面的方式获取从DB数据:
using ( DbManager db = new MyDbManager() )
{
IList<MyObjects> objects = db
.SetCommand(query)//sometimes with additional parameters
.ExecuteList<MyObjects>()
;
}
我想有执行以下能力:
using ( DbManager db = new MyDbManager() )
{
IQueryable<MyObjects> qObjs = db
.SetCommand(query)//sometimes with additional parameters
.ExecuteQuery<MyObjects>()// here I don't want query actually to be executed
;
// ... another logic, that could pass qObj into other part of program
IList<MyObjects> objects = qObjs
.Where(obj=>obj.SomeValue>=SomeLimit) // here I want to put additional filters
.ExecuteList() // and only after that I wan't to execute query and fetch results
;
}
是可能的变通方法,与修改的一部开拓创新查询字符串(修改WHERE部分),但有时它是相当复杂的。
有没有简单的方法来做到这一点?
感谢。有什么想法,欢迎!
解决方案
using ( DbManager db = new MyDbManager() )
{
IQueryable<MyObjects> qObjs =
from p in db.GetTable<MyObjects>()
//sometimes with additional parameters
select p;
// ... another logic, that could pass qObj into other part of program
IList<MyObjects> objects = qObjs
.Where(obj=>obj.SomeValue>=SomeLimit) // here I want to put additional filters
.ToList() // and only after that I wan't to execute query and fetch results
;
}
其他提示
如果你想有IQueriable,你必须使用Linq。 BlToolkit.Linq和BlToolkit.Data.Linq必须导入。
IQueryable<DataModel.Object> query = db.Object;
If ((int)cmb_somthing.SelectedValue) > 0 {
int ID = (int)cmb_somthing.SelectedValue;
query = query.Where(m=> m.ID = ID);
}
query = query.Where(m=> m.Date >= StartDate &&
m.Date <= EndDate);
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